1997 Aerostar/Ranger
Page 1 of 1
Section 13-11: Anti-Theft Alarm System
DESCRIPTION AND OPERATION
1997 Ranger Workshop Manual
Anti-Theft Alarm System
The theft warning system provides the vehicle with protection from unauthorized entry into the passenger
compartment and engine compartment (hood opening). It also protects against engine starting through
ignition keylock cylinder tampering. If triggered, the system provides both audio and visual alarm signals and
disables the starter circuit.
The system is controlled by a receiver assembly. This assembly also controls the electronic door lock control
system functions. System anti-theft functions are:
Perimeter sensing — doors, trunk, hood
Ignition keylock cylinder sensing
Starter interrupt
LED flashing when system is armed
Alarm (horn and lights)
For additional information and diagnostic procedures, refer to Section 18-04B .
When armed, unauthorized entry into the vehicle is detected by a hood switch or the door ajar switches. The
hood switch is monitored directly by the receiver assembly. The door ajar switches are monitored by the
generic electronic module (see Section 18-04A ). The GEM module signals the receiver assembly when a
door is ajar (opened). If the anti-theft system is armed, this signal will trigger the receiver assembly. The
door ajar signal will also prevent arming of the system if a door or liftgate is not fully closed.
Once triggered, the system flashes, the parking lamps (13200), the theft LED indicator, and sounds the
horn. In addition, the starter circuit is interrupted until the system is disarmed.
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB001.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 1 of 1
Section 13-11: Anti-Theft Alarm System
DESCRIPTION AND OPERATION
1997 Ranger Workshop Manual
Components
The system is composed of the following components:
Receiver assembly
Anti-theft warning indicator (output)
Door/liftgate disarm (input)
Hood switch (input)
Ignition keylock cylinder sensor (input)
Starter interrupt relay (output)
The following components already exist on the vehicle and are also used in the anti-theft system:
Horn relay (output)
Parking lamps (13200)
Generic Electronic Module (GEM) (input and output)
Starter relay
Park lamp autolamp/exit delay relay (output)
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB002.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 1 of 1
Section 13-11: Anti-Theft Alarm System
DESCRIPTION AND OPERATION
1997 Ranger Workshop Manual
Ignition Keylock Cylinder Sensor Operation
Ignition keylock cylinder sensing is provided by monitoring the status of the ignition lock cylinder when the
ignition is OFF. The keylock cylinder sensor "clip" located within the ignition key lock cylinder housing
senses if the key cylinder has been removed from a damaged steering column casting (as is done in most
hot wire attempts).
The receiver assembly should normally read 162 ± 40 ohms to ground through the ignition keylock cylinder
sensor. If the keylock cylinder sensor or its wiring become open or shorted, the perimeter alarm will trigger
even though the theft system may not be armed. If the ignition is in RUN or ACCY and the keylock cylinder
sensor input senses an open or a short, the theft system will not trigger until ignition is turned OFF.
As long as the ignition keylock cylinder sensor and associated wiring remain defective, the system will not
trigger again due to this input until the problem is corrected and battery power is removed and reapplied to
the module with a good sensor input. The alarm may then trigger again due to the ignition keylock cylinder
sensor once the resistance changes away from 162 ohms.
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB003.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 1 of 1
Section 13-11: Anti-Theft Alarm System
DESCRIPTION AND OPERATION
1997 Ranger Workshop Manual
Starter Interrupt Function
When the anti-theft system is triggered, the receiver assembly energizes a relay that prevents cranking of
the engine (6007). When the receiver assembly (module) provides a ground path for the relay coil, the
normally closed contacts open. With the contacts open, the circuit between the ignition switch and starter
motor relay is incomplete.
The alarm system operating sequences are designed to be passive; therefore, the system can be armed or
disarmed when following normal vehicle exit and entry procedures. Following is a detailed description of the
system operation.
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB004.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 1 of 1
Section 13-11: Anti-Theft Alarm System
DESCRIPTION AND OPERATION
1997 Ranger Workshop Manual
System Arming
The system is ready to arm any time the ignition switch (11572) is turned OFF and the PANIC alarm is off.
There are two ways to PREARM the anti-theft system:
1. Press the remote entry transmitter LOCK button once to lock the doors (with the doors open or
closed). If the lock is pressed again within 5 seconds, the horn will either chirp once to indicate all
doors are closed and the system is arming, or will chirp twice if any door is open (preventing the
system from arming).
2. Open a door and press the power door lock button to lock the doors.
If a door is open, the anti-theft system is prearmed and waiting for all doors to close. The THEFT LED in the
instrument panel (04320) will light continuously while the system is prearmed. Once all doors are closed, if
any were open, the system will be prearmed with a 30 second countdown to become armed. The THEFT
LED will remain lit continuously until the system is ARMED. When the system is armed, the THEFT LED will
begin to flash for 50 mS every two seconds until the system is triggered or disarmed.
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB005.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 1 of 1
Section 13-11: Anti-Theft Alarm System
DESCRIPTION AND OPERATION
1997 Ranger Workshop Manual
Cancelling the PREARM Sequence
If the anti-theft system is prearmed and waiting, it will wait only 30 minutes for a door to close. The THEFT
LED will remain lit for this time. If a door does not close within 30 minutes, the LED will turn off and the theft
system will return to a disarmed state.
An anti-theft system PREARM can also be cancelled before the system is armed by:
pressing the unlock switch on the door
any disarm event (see Disarming the System)
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB006.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 1 of 1
Section 13-11: Anti-Theft Alarm System
DESCRIPTION AND OPERATION
1997 Ranger Workshop Manual
Disarming the System
NOTE: A perimeter alarm will "shut off" after 165 seconds, but the system is still triggered and is not
disarmed. The starter circuit will remain disabled until the system is disarmed.
An Armed or triggered system can be disarmed by one of the four events listed.
1. Unlock the doors by pressing the remote entry transmitter UNLOCK button once.
2. Unlock any door with a key.
3. Turn ignition to RUN or ACCY.
4. The remote entry PANIC button will disarm the anti-theft system only when the perimeter alarm is
triggered and sounding.
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB007.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 1 of 1
Section 13-11: Anti-Theft Alarm System
DESCRIPTION AND OPERATION
1997 Ranger Workshop Manual
Alarm States When Battery Power Is Cycled
When the receiver assembly is powered the very first time at the vehicle assembly plant the system will be in
the DISARMED state. The receiver assembly will remember whether it is ARMED, DISARMED or
TRIGGERED in its non-volatile memory. When battery power is removed and then reconnected, the system
will return to its state just before the battery (10655) was disconnected. If the system is in any PREARM
state as described previously, then the system will return to a DISARMED state when battery is
disconnected and then reconnected.
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB008.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 1 of 2
Section 13-11: Anti-Theft Alarm System
DESCRIPTION AND OPERATION
1997 Ranger Workshop Manual
System Triggering
The alarm can be triggered by the following events if the system has been armed and has not been
disarmed first.
1. Open any door.
2. Open the hood (16612) (if the hood was open when the system was armed, it must be closed before
it can trigger the alarm).
3. Disturb the ignition keylock cylinder sensor affecting the monitored resistance to ground. A
disturbance of this sensor is the only event which will trigger an unarmed alarm.
4. The anti-theft system may be triggered inadvertently when the module is disconnected and then
reconnected. To avoid this condition, disconnect the smaller 22-pin connector first. This alarm trigger
is stored by the receiver assembly as Ignition Tamper Sensor Trigger event (IGNTAM) in the
diagnostic list of alarm trigger events.
NOTE: Although the remote entry PANIC alarm is not associated with the monitoring of the vehicle,
the user will frequently say that the theft system was triggered when actually the PANIC button was
inadvertently pressed. A panic alarm will not flash the THEFT LED. PANIC is stored in the diagnostic
list of alarm events to aid in diagnosis.
When the system is triggered, the starter interrupt and perimeter alarm will operate as follows:
STARTER INTERRUPT — starter circuit interrupted until system is disarmed. The normally closed external
starter interrupt relay will be pulled in to disallow power to travel through the starter circuit.
PERIMETER ALARM — approx. 250 mS on, 450 mS off cycle for two minutes and 45 seconds for North
America.
Parking lamps
Horn
THEFT LED
The perimeter alarm can be retriggered, after a perimeter alarm has sounded for 165 seconds. After a
perimeter alarm has timed out, if any trigger input is seen as normal and then in its trigger state, the
perimeter alarm will be retriggered. The perimeter alarm can be triggered a total of three times between an
arming sequence and a disarm event. An active panic alarm will be deactivated when a perimeter alarm is
triggered (a perimeter alarm overrides a panic alarm).
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB009.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 2 of 2
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB009.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 1 of 1
Section 13-11: Anti-Theft Alarm System
DESCRIPTION AND OPERATION
1997 Ranger Workshop Manual
PANIC Alarm Activation
The PANIC alarm, operated from the remote keyless entry transmitter, is activated when the button marked
PANIC on the remote transmitter is pressed. The PANIC alarm consists of the horn sounding and the
parking lamps and tail lamps flashing.
This subsystem can only be deactivated by pressing PANIC again or turning the ignition switch (11572) to
the RUN or ACC position.
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB010.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 1 of 7
Section 13-11: Anti-Theft Alarm System
DIAGNOSIS AND TESTING
1997 Ranger Workshop Manual
Electrical Schematics
Anti-Theft System, Power Feed, Activation and Disarm
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB011.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 2 of 7
Anti-Theft System, Starter Motor Interrupt
Anti-Theft System, Exterior Light Alarm
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB011.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 3 of 7
Anti-Theft System, Horn Alarm
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB011.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 4 of 7
Receiver Assembly Connector C1
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB011.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 5 of 7
Pin Number
Circuit
1
129 (LG)
2
—
3
70 (LB/W)
4
—
Not Used
5
—
Not Used
6
—
Not Used
7
—
Not Used
8
—
Not Used
9
25 (DG/P)
10
—
11
Circuit Function
Driver Door Unlock Relay
Not Used
Diagnostic Serial Link
Door Disarm Switches
Not Used
999 (R/BK) GEM Module Door Ajar Input to RAP
12
—
Not Used
13
—
Not Used
14
—
Not Used
15
—
Not Used
16
—
Not Used
17
936 (DG/W) Ignition Keylock Cylinder Tamper Sensor
18
—
Not Used
19
—
Not Used
20
—
Not Used
21
—
Not Used
22
—
Not Used
23
23 (T/LG)
24
—
25
26
Hood Switch
Not Used
1002 (B/PK) Ignition Switch Feed
—
Not Used
Receiver Assembly Connector C2
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB011.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 6 of 7
Pin Number
Circuit
1
—
Not Used
2
—
Not Used
3
—
Not Used
4
—
Not Used
5
—
Not Used
6
—
Not Used
7
—
Not Used
8
218 (W/P)
Park Lamp Relay
9
342 (LG/P)
Starter Interrupt Relay
10
Circuit Function
1013 (BR/LG) Illuminated Entry Request to GEM Module — Input
11
120 (PK/LG) All Unlock Relay
12
645 (W/LB)
13
—
14
570 (BK/W)
15
—
16
Anti-Theft Module — Fused Feed
Not Used
Ground
Not Used
343 (DB/LG) Anti-Theft LED
17
—
Not Used
18
—
Not Used
19
—
Not Used
20
6 (Y/LG)
Horn Relay
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB011.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
21
—
22
119 (PK/Y)
Page 7 of 7
Not Used
All Lock Relay
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB011.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 1 of 2
Section 13-11: Anti-Theft Alarm System
DIAGNOSIS AND TESTING
1997 Ranger Workshop Manual
All Relay Connectors
The harness connector to each system relay (horn, parklamp, starter interrupt) have the same pinout. Check
the Electrical Schematics for circuit number, wire gauge and color.
Item
Part Number
Description
1
—
Battery Feed to Coil
2
—
Coil Ground
3
—
Battery Feed to Contacts
4
—
Normally Closed Connector
5
—
Coil Energized Contact
NOTE: NEVER probe power or ground to Pins 1 or 2 of these relays.
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB012.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 2 of 2
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB012.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 1 of 2
Section 13-11: Anti-Theft Alarm System
DIAGNOSIS AND TESTING
1997 Ranger Workshop Manual
Inspection and Verification
The electronic door lock control system is diagnosed as part of the overall remote control alarm and lock
system. Refer to Section 18-04B to initiate system self test, New Generation Star (NGS) Tester use and
diagnostic test codes.
1. Verify the vehicle owner's original concern by duplicating the concern.
2. Inspect to determine if one of the following mechanical or electrical concerns apply:
VISUAL INSPECTION CHART
Mechanical
Electrical
Damaged liftgate door lock cylinder
Open fuses
Loose connections
Corroded connections
3. If the concern(s) remains after the inspection, determine the symptom(s) and proceed to the following
symptom chart.
NOTE: For system inspection and verification using New Generation Star (NGS) Tester 007-00500 or
equivalent, refer to Section 18-04B .
NOTE: Voltage and resistance readings can be obtained using Rotunda 73 Digital Multimeter 105R0051 or equivalent.
To test and service door lock system:
Check that battery is fully charged (if not, it may be causing the concern).
NOTE: When the battery has been disconnected and reconnected, some abnormal symptoms may
occur while the powertrain control module (PCM) (12A650) relearns its adaptive strategy. The vehicle
may need to be driven 16 km (10 miles) or more to relearn the strategy.
Disconnect and reconnect battery to make sure system is reset.
Perform the self test. If necessary, refer to Section 18-04B .
Service only as specified in the tests.
Repeat the self test to make sure the system is operational.
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB013.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 2 of 2
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB013.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 1 of 2
Section 13-11: Anti-Theft Alarm System
DIAGNOSIS AND TESTING
1997 Ranger Workshop Manual
Symptom Chart — Anti-Theft Alarm System
ANTI-THEFT ALARM SYSTEM
Condition
Possible Source
Action
Alarm Triggers As Soon
As Ignition Is Turned OFF
Loose ignition
tamper sensor or its
wiring.
GO to Pinpoint Test A .
Alarm Triggers When the
Driver's Door Is Open
After Being Unlocked with
a Key
Driver disarm switch
or its wiring.
GO to Pinpoint Test C .
Alarm Triggers When the
Passenger's Door Is
Open After Being
Unlocked with a Key
Passenger disarm
switch or its wiring.
GO to Pinpoint Test C .
Alarm Triggers
Intermittently
Any switches
monitored for
triggering an alarm.
Unintended presses
of panic button on
transmitter.
GO to Pinpoint Test A .
Hood switch circuit
short/open.
Hood switch not
depressed when
hood closed.
GO to Pinpoint Test A .
Alarm Not Triggered by
Hood Switch.
Horn Sounds
Continuously (No
Honking On and Off)
During Alarm
Unusual alarm
configuration
programmed.
GO to Pinpoint Test B .
Vehicle Will Not Start,
Battery Fully Charged
No start condition
other than starter
interrupt relay.
GO to Section 03-06 .
Starter interrupt
relay wiring
short/open.
Starter interrupt
relay missing.
GO to Pinpoint Test B .
Alarm Is Disarmed by
Locking a Door with a
Key (Instead of
Unlocking)
Wiring to disarm
switch or switch has
been reversed.
GO to Pinpoint Test C .
THEFT LED Does Not
Light
Wiring to LED is
open.
LED is burned out
due to a short in the
wiring.
GO to Pinpoint Test D .
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB014.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Anti-Theft Never Arms
(THEFT LED Doesn't
Light)
Page 2 of 2
Anti-Theft Never Arms
(THEFT LED Lights but
Never Flashes)
Anti-Theft Does Not Arm
Only Using Door Lock
Button and an Open Door
Any door disarm
circuit is shorted.
Any door disarm
switch is shorted.
Door unlock switch
or circuit shorted.
Any door is ajar or
open.
Any door does not
close properly.
Any door ajar switch
or wiring is shorted.
GEM to receiver
assembly door ajar
circuit is grounded.
Any door is ajar or
open.
Any door ajar switch
or wiring is shorted.
GEM to receiver
assembly door ajar
circuit is grounded.
Door lock switch to
receiver assembly
circuit.
GO to Pinpoint Test E .
NOTE: Before proceeding
with Pinpoint Test, GO to
Section 18-04B for system
self test and diagnostic test
codes.
GO to Pinpoint Test E .
NOTE: Before proceeding
with Pinpoint Test, GO to
Section 18-04B for system
self test and diagnostic test
codes.
GO to Pinpoint Test E .
NOTE: Before proceeding
with Pinpoint Test, GO to
Section 18-04B for system
self test and diagnostic test
codes.
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB014.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 1 of 12
Section 13-11: Anti-Theft Alarm System
DIAGNOSIS AND TESTING
1997 Ranger Workshop Manual
Pinpoint Tests
PINPOINT TEST A: FALSE ALARMS AND TRIGGERING ALARMS
A1 CHECK ALARM HISTORY FOR FALSE ALARMS
Enter in NGS: RAP, PID/DATA and select AL EVT1 through AL EVT8 to monitor the last 8 events
which have caused the alarm to trigger. AL EVT1 is the most recent and AL EVT8 occurred
before all of the others.
Write down alarm events in case display is changed by triggering alarm.
Does NGS display an alarm that shows up much more than any other alarm?
Yes
No
If display shows two door open triggers
(DROPEN), GO to A2 . If display shows two
hood switch triggers (HOODTR), GO to A3 . If
display shows an ignition tamper trigger
(IGNTAM), GO to A4 . If NGS display shows
several PANIC alarm triggers, GO to A5 .
If NGS does not display a dominant trigger
event or most events are no event, NOEVNT,
GO to A2 to REVIEW alarm trigger events.
A2 CHECK DOOR AJAR INPUT
Accidental triggering of an armed system can be caused by the owner. The theft system is working
normally when the alarm is triggered with someone in the armed vehicle, and they later exit by pulling
on the door handle to open the door. Another common trigger which is an OK system is when the
customer opens a locked door through an open window. These events may have cause the DROPEN
alarm history in addition to the following diagnostics.
If the door mechanically unlocks and can be open, without first having electrically sensed that the key
turned to the unlock position to disarm the system, then the alarm will be triggered due to a door ajar
switch (caused by door disarm switches).
Enter in NGS: RAP, PID/DTA and select DOORRAP to monitor the GEM door ajar to see door ajar
state.
Close all doors.
NGS DOORRAP state is CLOSED.
Open each door separately.
NGS DOORRAP state is AJAR.
NOTE: The alarm trigger history must be cleared after servicing the anti-theft system for
inadvertent triggering. The alarm history is cleared by entering in the NGS: RAP DIAGNOSTIC
TEST MODES RETRIEVE/CLEAR CONTINUOUS DTCS then press START, RECORD DTCS and
press C ALL (button 7) to clear.
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB015.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 2 of 12
Do both states appear on the NGS?
Yes
No
TEST for intermittent door ajar switches
(possibly due to water) in the GEM system
(REFER to Section 18-04A ), or TEST door
disarm switches. GO to C2, or CLARIFY with
the customer to IDENTIFY how alarm was
triggered with the door.
If NGS display is always AJAR, SERVICE door
ajar circuits/switches with GEM module
diagnostics (REFER to Section 18-04A ), or
SERVICE Circuit 999 (R/BK) for a short to
ground. If NGS display is always CLOSED,
SERVICE Circuit 999 (R/BK) for an open or
SERVICE door ajar input circuits/switches with
GEM module diagnostics (REFER to Section
18-04A ).
A3 CHECK HOOD SWITCH INPUT
The theft system is working normally when the alarm is armed with someone in the vehicle or when
reaching through an open window, and they pull the hood release to open the hood. This may be a
cause of the alarm trigger history.
If a cover is installed on the front of the vehicle, the hood may not close far enough to fully press the
hood switch plunger. You may need to bend the hood switch bracket slightly to insure the hood switch
is pressed enough.
Close hood.
Enter in NGS: RAP, PID/DATA and select HOOD SW to monitor the hood switch state.
NGS HOOD SW state of not PUNCHD should be displayed.
Check to see that wiggling the hood up and down, while it is latched and closed, does not cause the
hood switch state to change from not PUNCHD.
Open the hood.
NGS HOOD SW state is PUNCHD should be displayed.
Do the above states appear on the NGS as described?
Yes
No
Hood switch operation is OK. CLARIFY with
customer and REVIEW customer symptoms
table.
If HOOD SW state is always not PUNCHD,
SERVICE hood switch Circuit 23 (T/LG) for an
open, or CHECK hood switch to CONFIRM that
when it is not pressed its contacts close. If
HOOD SW state is always PUNCHD,
SERVICE Hood Switch Circuit 23 (T/LG) for a
short to ground, or CHECK hood switch to
CONFIRM that when it is PRESSED its contacts
are open. VERIFY that hood switch plunger
closes fully when hood is closed. If NGS state
changes when hood is wiggled, VERIFY that
hood switch plunger closes fully when hood is
closed. Hood switch bracket can be bent slightly
to INSURE hood switch is pressed enough.
A4 CHECK IGNITION TAMPER SENSOR INPUT
Receiver assembly deals with ignition tamper sensor differently then other systems. Read ignition
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB015.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 3 of 12
tamper sensor description and operation.
Each time battery is reapplied to the system, module will wait to see a normal tamper sensor and will
then trigger alarm (armed or not) when ignition is off and sensor resistance to module changes
outside of 120 to 210 ohm boundary.
Enter in NGS: RAP, PID/DATA and select IGN RES to monitor ignition tamper sensor state.
The receiver assembly will respond with one of three states: 162 ohm, 0 ohms, or HIGH.
Is the ING RES state 162OHM?
Yes
No
Ignition tamper sensor and SYSTEM are OK,
they are unlikely now to be intermittent.
If IGN RES state is 0 ohms, SERVICE ignition
tamper Circuit 936 (DG/W) for a short to ground,
REMOVE and RECONNECT battery, and
REPEAT Test A4 . If IGN RES state is HIGH,
SERVICE ignition tamper Circuit 936 (DG/W) for
an open, or REINSTALL ignition tamper sensor,
or REPLACE ignition tamper sensor.
A5 PANIC ALARM OPERATION
The receiver assembly PANIC alarm is not a theft alarm trigger event, but quite often an owner
bumps the PANIC button on the transmitter by accident as they are walking away from their vehicle
and say that their theft alarm is going off.
The PANIC button may be pressed by objects inside of a purse or pocket, without the customer
knowing. If several PANIC codes appear in the alarm history, you know that this is the case.
The customer may need to take a couple of steps close to the vehicle from where the PANIC alarm
was started in order to stop the PANIC alarm or turn the key to RUN.
Can cause of false alarms be traced to accidental triggering by owner?
Yes
No
PANIC alarm system is OK. CLARIFY operation
with owner and CHECK symptom table if
RETURN to Symptom Chart.
necessary.
No Starts and Alarm Outputs
The receiver assembly can only defeat the starter with the extended anti-theft (starter interrupt) relay. If a
temporary jumper is installed across the normally closed contacts of the starter relay as outlined below and
the vehicle does not start, check for other causes.
PINPOINT TEST B: NO STARTS AND ALARM OUTPUTS
B1 ALARM VERIFICATION — TRIGGER AND THEFT LED
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB015.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 4 of 12
Open driver door window.
Arm theft system.
Trigger theft alarm by pulling on inside door handle to open driver door.
Does THEFT LED flash when theft system is triggered?
Yes
No
If THEFT LED does not come on, GO to
Pinpoint Test D . If theft system did not arm, GO
to Pinpoint Test E .
GO to B2 .
B2 ALARM VERIFICATION — PARKLAMPS AND HORN
Does horn honk on and off and parking lamps flash?
Yes
No
If only the park lamps flash, GO to B4 . If only
the horn honks, GO to B6 . If neither the horn
nor the parklamps are pulsing, GO to B4
GO to B3 .
B3 ALARM VERIFICATION — STARTER INTERRUPT
Does vehicle start?
Yes
No
Alarm outputs OK. CLARIFY with customer and
GO to B8 .
REVIEW customer symptoms table.
B4 CHECK RECEIVER ASSEMBLY PARKLAMPS OUTPUT
Stop alarm with any disarm event.
Enter in NGS: RAP, ACTIVE COMMANDS, HEAD/PARKING LAMPS and select PARK LAMP ON.
Do park lamps turn on?
Yes
REPLACE the RAP module. RETEST the
system.
No
GO to B5 .
B5 PARK LAMPS JUMPERED OPERATION
Disconnect receiver assembly.
Momentarily short park lamp Circuit 218 (W/P) to signal ground Circuit 570 (BK/W).
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB015.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 5 of 12
Did park lamps turn on?
Yes
No
REPLACE the RAP module. RETEST the
system.
SERVICE park lamps, park lamp relay or power
circuit from park lamp relay to park lamps.
B6 CHECK RAP HORN OUTPUT
Stop alarm with any disarm event.
Enter in NGS: RAP, ACTIVE COMMANDS, HORN and select HORN ON.
Does horn sound?
Yes
No
REPLACE the RAP module. RETEST the
system.
GO to B7 .
B7 HORN JUMPERED OPERATION
Disconnect receiver assembly.
Momentarily short horn Circuit 6 (Y/LG) to signal ground Circuit 570 (BK/W).
Does horn sound?
Yes
REPLACE the RAP module. RETEST the
system.
No
SERVICE horn, horn relay, Circuit 6 (Y/LG) for
an open or power circuit for the horn.
B8 CHECK RECEIVER ASSEMBLY STARTER INTERRUPT OUTPUT
Stop alarm with any disarm event.
Enter in NGS: RAP, ACTIVE COMMANDS, STARTER INTERRUPT and select STARTER ON.
Turn ignition key to start for less than 2 seconds.
Is starter motor disabled (no cranking)?
Yes
System OK.
No
GO to B9 .
B9 STARTER INTERRUPT JUMPERED OPERATION
Disconnect receiver assembly.
Momentarily short starter interrupt output Circuit 342 (LG/P) to signal ground Circuit 570 (BK/W).
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB015.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 6 of 12
Does the starter operate?
Yes
No
REPLACE the RAP module. RETEST the
system.
RAP system OK. SERVICE starter, anti-theft
relay, or power circuit for starter.
PINPOINT TEST C: DISARMING ANTI-THEFT
C1 CONFIRM REMOTE DISARMING SEQUENCE
Arm theft system; THEFT LED is on.
Perform disarming sequence by pressing UNLOCK on a transmitter as described in Description and
Operation, Disarming the System.
Confirm doors unlocked when transmitter button was pressed.
Did system disarm and THEFT LED turn OFF?
Yes
No
If the doors did not unlock, GO to Diagnosis and
Testing in Section 01-14B . If theft system did
not arm, GO to Pinpoint Test E .
GO to C2 .
C2 CONFIRM DOOR KEY DISARMING SEQUENCE
NOTE: If door mechanically unlocks and can be opened, without first having electrically
sensed key turned to unlock position to disarm system, then alarm will be triggered by door
ajar switch.
Arm theft system; THEFT LED is on.
Perform disarming sequence by turning door key to unlock position as described in Description and
Operation, Disarming the System.
Confirm door unlocked (not locked) when key was turned.
Perform above steps for passenger door.
Did system disarm and THEFT LED turn OFF?
Yes
GO to C6 .
No
If doors did not unlock, GO to Diagnosis and
Testing in Section 01-14B . There is a
mechanical interference. If theft system did not
disarm, GO to C3 .
C3 CHECK THE DOOR DISARM SWITCH INPUT
NOTE: If the door mechanically unlocks, and can be opened without first having the system
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB015.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 7 of 12
disarm because it electrically sensed the key turned to unlock position, then the alarm will be
triggered by the door open warning lamp switch.
Enter in NGS: RAP, PID/DATA and select DR DARM to monitor.
The PID/DATA DR ARM should read NOT ACT.
Turn the key in each door lock cylinder to the UNLOCK position. While the key is in the UNLOCK
position, the DR DARM PID should read ACTIVE for each door.
Did both PID states appear?
Yes
No
If only the DR DARM PID state ACTIVE
appeared; Go to C4 .
REPLACE the RAP module. RETEST the
system.
If only the DR DARM PID state NOT
appeared; Go to C5 .
ACT
C4 CHECK CIRCUIT 25 (DG/P)
Turn the ignition to the OFF position.
Disconnect RAP module connector C1.
Measure the resistance between the RAP connector C1 pin 9, circuit 25 (DG/P), and chassis ground.
Is the resistance 10,000 ohms or less?
Yes
No
REPAIR circuit 25 (DG/P). RETEST the system.
REPLACE the RAP module. RETEST the
system.
C5 CHECK CIRCUIT 25 (DG/P)
Turn the ignition in the OFF position.
Disconnect RAP module connector C1.
Measure the resistance between the RAP connector C1 pin 9, circuit (DG/P) and chassis ground,
while the door lock cylinder is turned to the UNLOCK position.
Is the resistance 10,000 ohms or less?
Yes
REPLACE the RAP module. RETEST the
system.
No
REPAIR circuit 25 (DG/P). RETEST the system.
C6 CHECK THE IGNITION INPUT OPERATION
Arm the theft system; theft LED in ON.
Perform the disarming sequence by turning the ignition switch to the RUN position.
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB015.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 8 of 12
Did the system disarm and theft LED turn OFF?
Yes
No
Anti-theft system disarming is OK.
GO to C7 .
C7 CHECK IGNITION INPUT
Enter in NGS: RAP, PID/DATA and select IGN RAP to monitor ignition switch state.
Turn ignition key to OFF position. NGS communication may be lost after a few seconds.
NGS IGN RAP state is OFF should be displayed.
Return ignition key to RUN position and resume NGS PID/DATA communication if necessary.
NGS IGN RAP state is RUN should be displayed.
Do both states appear on the NGS?
Yes
No
Anti-theft disarming system is OK. CLARIFY
with customer and REVIEW customer
symptoms table.
If NGS displays a constant RUN state,
SERVICE the ignition switch or SERVICE
Circuit 1002 (B/PK) for a 100 ohm or less
battery short. If NGS displays a constant OFF,
SERVICE Circuit 1002 (B/PK) for an open,
blown fuse, or short to ground or SERVICE the
ignition switch.
THEFT LED Operation
PINPOINT TEST D: ANTI-THEFT LED OPERATION
D1 ANTI-THEFT LED OPERATION
CAUTION: Do not jumper battery voltage to the THEFT LED directly.
Do not treat the THEFT LED like a bulb. Most of the battery voltage is dropped across a resistor
internal to the receiver assembly so that very little current is supplied to the LED. If you place battery
voltage directly to the LED, the LED will burn out.
Enter in NGS: RAP, ACTIVE COMMANDS, ALARM OUTPUT and select ALARM ON to turn on
THEFT LED.
Does ANTI-THEFT LED turn on?
Yes
The THEFT LED output and LED are OK.
No
GO to D2 .
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB015.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 9 of 12
D2 CHECK ANTI-THEFT LED
Disconnect instrument cluster and remove THEFT LED. Measure resistance across LED. With the
NGS: DIGITAL MEASUREMENT, OHMMETER, select RANGE as AUTO.
Is resistance between 10 and 20 ohms?
Yes
No
SERVICE Circuit 343 (DB/LG) for an open or
short, or SERVICE ground circuit for instrument
cluster on low side of the LED.
REPLACE damaged LED and RETEST.
Arming Anti-Theft
When symptom is THEFT LED does not come on, this may mean that there is an issue with the LED or it
may mean that the theft system is not arming at all.
PINPOINT TEST E: ARMING ANTI-THEFT
E1 CONFIRM REMOTE ARMING SEQUENCE
Open driver door window.
Perform arming sequence by pressing LOCK on a transmitter as described in Description and
Operation, System Arming.
Confirm that doors locked when transmitter button was pressed.
If THEFT LED does not light, wait at least 45 seconds after all doors are closed and locked. Theft
system may still arm, but LED may not be working. Reach through window and open door to trigger
armed system.
Did the system arm and trigger?
Yes
GO to E2 .
No
If doors did not lock, GO to Diagnosis and
Testing in Section 01-14B . If system armed and
triggered, but THEFT LED did not light, GO to
Pinpoint Test D. If theft system did not arm, GO
to E3 .
E2 CONFIRM DOOR LOCK ARMING SEQUENCE
Confirm anti-theft system is disarmed by pressing UNLOCK button on transmitter.
Perform arming sequence by opening door, pressing LOCK on door lock switch and closing door as
described in Description and Operation, System Arming.
Confirm doors locked when door lock button was pressed.
Did system arm?
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB015.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 10 of 12
Yes
No
Anti-theft arming system is OK. CLARIFY with
customer and REVIEW customer symptoms
chart.
If doors did not lock, GO to Diagnosis and
Testing in Section 01-14B . If theft system did
not arm, GO to E3 .
E3 CHECK DOOR AJAR INPUT
Enter in NGS: RAP, PID/DATA and select DOORRAP to monitor GEM Door Ajar to see Door Ajar
State.
Close all doors.
DOORRAP state is CLOSED should be displayed on NGS.
Open any door.
DOORRAP state is AJAR should be displayed on NGS.
Do both states appear on the NGS?
Yes
No
If DOORRAP state is always AJAR, SERVICE
door ajar input circuits/switches with GEM
module diagnostics (refer to Section 18-04A ),
or SERVICE Circuit 999 (R/BK) for a short to
ground with ignition in RUN. If DOORRAP state
is always CLOSED, SERVICE Circuit 999
(R/BK) for an open or SERVICE door ajar input
circuits/switches with GEM module diagnostics
(refer to Section 18-04A ).
GO to E4 .
E4 CHECK IGNITION INPUT
Enter in NGS: RAP, PID/DATA and select IGN RAP to monitor ignition switch state.
Turn ignition key to OFF position. NGS communication may be lost after a few seconds.
IGN RAP is OFF should be displayed on NGS.
Return ignition key to RUN position and resume NGS PID/DATA communication if necessary.
IGN RAP state is RUN should be displayed on NGS.
Do both states appear on NGS?
Yes
GO to E5 .
No
If IGN RAP state is always RUN, SERVICE
the ignition switch or SERVICE Circuit 1002
(B/PK) for a 100 ohm or less battery short. If
IGN RAP state is always OFF, SERVICE
Circuit 1002 (B/PK) for an open, blown fuse, or
short to ground or SERVICE ignition switch.
E5 CHECK DOOR DISARM SWITCH INPUT
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB015.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 11 of 12
If anti-theft system module receives a shorted door disarm switch-signal, the module will react by
disarming theft system. Even when a valid arming sequence has been entered, theft system will
immediately disarm as soon as the system is armed.
Enter in NGS: RAP, PID/DATA and select DR DARM to monitor door disarm state.
NGS DR DARM is notACT should be displayed on NGS.
Turn key in each door to unlock door and leave key in unlock position. Make sure that it is unlock and
not lock position.
DR DARM is active should be displayed on NGS.
Do both states appear on NGS?
Yes
No
If DR DARM state is always ACTIVE, CHECK
door disarm switch on each key cylinder for an
internal short (switches should be normally open
when key is removed from cylinder), or
SERVICE disarm switch Circuit 25 (DG/P) for a
short to ground. If DR DARM state is always
not ACT, SERVICE disarm switch Circuit 25
(DG/P) for an open. CHECK at door disarm
switch that tested always notACT to see if it
shorts when key is turned in unlock position.
GO to E6 .
E6 CHECK DOOR UNLOCK SWITCHES
If anti-theft system is constantly seeing a shorted door unlock switch, module will react by disarming
theft system. Even when a valid arming sequence has been entered, theft system will immediately
disarm as soon as system is armed.
Press LOCK button on each door lock switch and confirm that NGS, RAP DD_ LOCK PID state
changes to LOCK when switches are pressed.
Press UNLOCK button on each door lock switch and confirm that NGS, RAP DD_ LOCK PID state
changes to UNLOCK when switches are pressed.
Does LOCK and UNLOCK state for each door lock switch occur?
Yes
No
If UNLOCK state does not occur, CHECK and
SERVICE all unlock Circuit 120 (PK/LG) or door
unlock switches for an open, or SERVICE
grounding circuit for door lock switch. Refer to
Section 01-14B .
System is operating properly. RETURN to
Symptom Chart.
If LOCK state does not occur, CHECK and
SERVICE the all lock Circuit 119 (PK/Y) or door
lock switches for an open. Refer to Section 0114B . If DD_ LOCK state is always UNLOCK,
CHECK and SERVICE all unlock Circuit 120
(PK/LG) or door unlock switches for a short to
ground. Refer to Section 01-14B . If DD_LOCK
PID state is always LOCK, CHECK and
SERVICE all lock Circuit 119 (PK/Y) or door
lock switches for a short to ground. Refer to
Section 01-14B .
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB015.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 12 of 12
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB015.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 1 of 1
Section 13-11: Anti-Theft Alarm System
DIAGNOSIS AND TESTING
1997 Ranger Workshop Manual
Component Tests
Door Disarm Switch
Using Rotunda 73 Digital Multimeter 105-R0051 or equivalent, measure switch resistance with key removed
from the door lock. The resistance should be more than 25,000 ohms. If not, replace the door disarm switch.
Measure the switch resistance with the key fully rotated to the end of travel in the unlock direction. The
resistance should be less than 200 ohms. If not, replace the door disarm switch.
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB016.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 1 of 3
Section 13-11: Anti-Theft Alarm System
REMOVAL AND INSTALLATION
1997 Ranger Workshop Manual
Ignition Tamper Sensor
Removal and Installation
NOTE: Disconnect and reconnect battery ground cable to ensure RAP system resets to include
monitoring of this sensor.
1. Remove ignition key lock cylinder from steering column housing. Refer to Section 11-04A .
2. Slide ignition lock anti-theft switch (19A438) off steering column.
3. Disconnect ignition tamper sensor from steering column locators and wiring harness.
4. To install, reverse removal procedure.
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB018.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 2 of 3
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB018.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 3 of 3
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB018.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 1 of 2
Section 13-11: Anti-Theft Alarm System
REMOVAL AND INSTALLATION
1997 Ranger Workshop Manual
Hood Switch
Removal and Installation
1. Locate hood switch on RH side of fender apron.
2. Disconnect electrical connector from hood switch.
3. Remove one screw retaining hood switch.
4. To install, reverse removal procedure, and make sure that the hood switch bracket locator leg is
seated firmly when driving screw to retain hood switch.
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB021.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 2 of 2
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB021.HTM~gen~ref.HTM 2011-04-29
1997 Aerostar/Ranger
Page 1 of 1
Section 13-11: Anti-Theft Alarm System
SPECIFICATIONS
1997 Ranger Workshop Manual
SPECIFICATIONS
TORQUE SPECIFICATIONS
Description
Nm
Lb-In
Hood Switch Screw 4.5-6.3 40-56
tomsn048@gmail.com
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVKDB022.HTM~gen~ref.HTM 2011-04-29