Table of Contents
Subject
Page
Introduction .......................................................................................
2
E46iC Bus Systems...........................................................................
4
Power Windows ................................................................................
5
Central Locking .................................................................................
6
Anti-Theft Alarm (DWA)...................................................................... 7
SDR Module (Currently Under Development, Not Yet Avaliable for The
U.S Market.
Lighting Circuits................................................................................. 10
Heated Rear Window ........................................................................ 12
Audio System .................................................................................... 14
Antennas/Diversity ............................................................................. 16
ENGINE/SUSPENSION/BRAKES
Drivetrain (Engine).............................................................................. 18
Front Suspension .............................................................................. 20
Rear Suspension ............................................................................... 21
Brakes
Initial Print Date: 02/2000
......................................................................................... 22
Revision Date: 4/13/00
BODY
BODY ELECTRONIC SYSTEMS
MODEL:
PRODUCTION DATE:
E46 CONVERTIBLE
01/2000
Objectives of the Module:
After completing this module, you will be able to:
• Define the changes that have occurred to the Body Electronic Systems for the E46iC.
• Describe the function of the new battery box for the E46iC.
• Discuss the operation of the SDR sensor for the DWA system.
• Describe the operation of the two relay system for the rear window defogger.
• Describe and identify the Antenna and diversity system of the E46iC
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BODY ELECTRONICS
INTRODUCTION
The body electronics systems of the E46iC primarily correspond to the E46 Coupe. This
includes the Instrument Cluster, Driver’s Information and Central Body Electronics (ZKE)
systems.
Various modifications were incorporated into these systems for Convertible specific usage.
Changes have occurred in the following systems:
•
•
•
•
•
•
•
•
Power Window Operation.
Central Locking System.
Anti - Theft Alarm System (DWA).
MRS III - Deletion of ITS Head Air Bags.
Heated Rear Window Operation (with soft and hard tops).
Audio System - Speaker Type and Location.
Audio System Antennas - Type and Location.
Universal Garage Door Opener (UGDO) - Incorporated into rear view mirror.
The location of the battery remains in the trunk. However, a newly designed battery box is
used. The battery box is allowed to float on the vertical axis through three articulated rods.
This allows the battery to act as an inertia mass and dampen various vibrations while the
vehicle is driven.
DAMPENING RODS
ART-BATTERY1
E46iC BUS SYSTEM
The Bus system of the E46iC continues to use the K-Bus as the main communication link
between body and driver information modules. The Convertible Top Module (CVM) is added
to the K-Bus for communication with the GM V for top operation and the Instrument Cluster
for diagnostic purposes. The addition of memory functions for both outside mirrors has
required memory modules to control the operation. These modules are also connected to
the K-Bus for communication with the Seat Memory module.
As with other MRS III systems, the MRS module is now connected to the K-Bus for coding/diagnostic and communication with the other control modules.
ART-I46ICBUS
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POWER WINDOWS
Power
switch
switch
switch
window operation has changed with the addition of the central power window
located in the console between the window switches on the left side. The central
allows all four windows to be opened with one touch operation or closed if the
is held.
The balance of the window switches allow one touch operation for opening. The driver’s
window switch is the only one touch close switch due to the elimination of the anti-trap protection feature.
The power windows are also opened when the top is lowered for approximately 1.5 seconds to ensure clearance when the top is lowered into the storage compartment. If the top
switch is held after opening, the windows will close again.
ART-E46ICPOWIND
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CENTRAL LOCKING
The glove box is integrated into the scope of the central locking system on the E46iC. An
additional actuator is positioned above the glove box to lock it whenever the central locking system is activated. Additionally, the trunk is locked out whenever the top storage cover
is unlocked while the top is being raised or lowered. The top storage cover motor hall sensor signals the GM any time the cover is unlocked.
The CVM receives a signal from the GM over the K-Bus, whenever the trunk is opened,
which locks out the soft top operation.
A micro switch on the glove box lock cylinder signals the GM to lock the trunk electrically
for the valet key position. The trunk can only be opened mechanically with either FZV key
or the wallet key.
All other functions of the central locking system remain the same as the E46 Sedan and
Coupe.
The antenna for the FZV system is incorporated with the receiver in the interior rear view
mirror.
VALET LOCK
ART-E46CENTRLLOCK
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ANTI-THEFT ALARM DWA
SDR Module (Currently Under Development,
Purpose of the System:
Not Yet Available for The U.S Market).
A new design interior sensor is used with the DWA system in the E46iC. It allows the interior of the vehicle to be monitored with either the top raised or lowered. The balance of the
DWA system remains the same as the system used in the Coupes and Sedans. The E46iC
uses two interior sensors for maximum vehicle protection.
Components of the System:
SDR Module
The Short Distance Radar (SDR) sensor is a motion detector based on microwave technology. The SDR modules are located on the drive shaft tunnel under the center console,
one sensor in front of the MRS control module and the second sensor under the rear ash
tray. This central positioning allows the most effective monitoring of the vehicle’s interior.
The modules consist of two
printed circuit boards with
one being the transmitting
and receiving aerials and
the other being the processing electronics. The
housing of the module is
made from highly conductive material in terms of high
frequency transmission.
ART-SDRMODULE
System Operation
The SDR sensor produces and transmits, via the transmitting antenna, an electromagnetic field in a hemispherical pattern within the vehicles interior. The monitoring radius is preset in the SDR module. The receiving antenna monitors any reflected signals from this
transmission and the module evaluates these signals as a base line for vehicle security. Any
objects that come within this monitoring radius with be detected and evaluated by the
module. The module will then signal the GM to trigger the alarm warning.
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The module operates by means of a continuous pulse mode (pulse radar) which involves
transmitting a signal, then pausing for the reflected signals to be received by the module.
The detection range of the sensor is adjusted by a rapid switching process when the system is armed. This allows the sensor to adjust its range to either the windshield with the top
lowered or the soft top when it is raised.
The SDR sensor can be switched OFF by activating the central locking system twice within 10 seconds as with the UIS motion detector on other DWA systems.
False alarms may be triggered by objects falling into the interior when the system is armed
with the top lowered.
Large metal objects will shield the microwave transmission and create a shadow effect in
the interior (for example: the seat back).
ART-E46ICBODY
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ANTI-THEFT ALARM DWA I P O
ART-E46ICINTSENS
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LIGHTING CIRCUITS
The E46iC uses Neon technology for the third brake light which is mounted in the trunk lid.
The remainder of the exterior lighting circuits carry over from the E46 Sedan and
Coupes.The Electronic brake light switch is the input to the LSZ for brake light activation.
The LSZ, as an output, provides power to the Neon light module for activation of the light.
The light module consists of the ignitor, and Neon tube.
NEON TECHNOLOGY:
34E46THIRDBRAKE0100
Neon (symbol Ne) produces a glow in a vacuum electric-discharge tube and is used
extensively in the familiar advertising displays.
A neon light is a glass bulb or tube containing neon (gaseous element) at low pressure,
and two metallic electrodes. To make a neon light, the tube is bent while warmed, to the
desired shape and sealed at both ends. During the sealing process, electrodes are added
at each end. An access port is left near one end and a vacuum is applied to the interior
of the tube. After the air and humidity has been removed, the neon gas is added under
low pressure and the tube is sealed.
The light produces a reddish-orange glow when an electric current (applied across the
electrodes) is raised in voltage to the point at which it ionizes the gas in the tube. The
voltage at which the light glows varies with the design of the tube. When the glass tube is
ionized, the voltage drop across the tube is constant, regardless of the amount of current
flowing through the tube. The neon glows with an even intensity throughout the length of
the tube.
A variant of this is the glass tube containing ionized neon at very low pressure. The tube
shines with a brilliant red glow if a high-voltage alternating current is applied to the electrodes sealed in the ends of the tube.
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LIGHTING CIRCUITS
The use of neon lighting provides several advantages to automobile manufacturers and
consumers:
• Light failures caused by shock and vibration are minimized, because neon operates
without a filament.
• The average life of the light is considerably higher as compared to incandescent bulbs.
• Styling of the light includes a more uniform distribution of light across the lens, and
neon tubes can be bent to conform to the contour of the vehicle.
• Amber neon allows the use of a clear lens (for vehicle color schemes).
•Neon enhances safety because of the extremely fast ignition time of the light
(instantaneous braking signal), allowing other drivers more time to react.
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HEATED REAR WINDOW
Purpose of the System:
A new two relay system was designed for the E46iC that supplies power to either rear window defogger grid. The two relay system will also communicates with the audio system
amplifier to change the dynamics of the sound for either top up/hard top installed or top
down driving
Components of the System:
Two relays, located on the right side rear quarter panel behind the interior trim cover, are
used for rear defroster operation.
• Relay RHH receives KL 30 and the
activation signal from the IHKA control
module. The output from the relay will
switch the rear defroster ON if the hard
top is installed.
• Relay RHV receives KL 30 from relay
RHH and it supplies the rear defogger
grid in the soft top glass window when
the top is raised.
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ART-RRWNDWRELAY
System Operation
The rear defroster operation remains a function of the IHKA system with the control module responsible for switching the system ON/OFF. Two rear defrosted grids are used, one
installed in the soft top rear glass and the other in the optional hard top rear glass.
When the button is pressed on the IHKA control panel, Relay RHH is energized. If the hard
top is installed, power is supplied to the grid through the connector strip on the hard top
lock.
Convertible Soft Top
Control Module
Closed & Locked
to Frame. 12V
Open & Unlocked
from Frame
OV
Rear Window Deffogger
Relay RHH
For Hard Top
Radio
Amp
12V OV
Rear Defroster
Relay RHV
For Rear Glass
Window
Heating and A/C
Control Module
Rear Window Defroster
Convertible Top
ART-61E46DEFROST0200
Relay RHH also supplies KL 30 to relay RHV when the button is pressed on the IHKA control panel. Relay RHV is energized when KL R is switched ON and the soft top is closed
and locked to the windshield frame. This allows the grid in the soft top to be heated. When
the soft top is lowered, KL R to relay RHV is interrupted by the CVM to prevent the grid
from heating when the top is lowered into the storage compartment.
The Harmon/Karden radio amplifier receives a high signal from relay RHV, when the top is
raised and locked, and the Harmon stereo sound is switched ON. If the top is lowered, the
amplifier receives a low signal and the stereo sound is switched OFF.
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AUDIO SYSTEM
The audio systems available for the E46iC correspond to the systems available in the E46
Coupe. Two radios, with either the in dash CD player or cassette player are available. The
navigation system with the board monitor is optional equipment. All sound systems are prewired for the optional CD changer that mounts in the trunk. The sound systems continue
to be interconnected on the K-Bus and all radio test functions carry over.
ART-BAYERN1
ART-BAYERN2
84E46NAVG0000
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HARMAN/KARDEN SOUND SYSTEM
Speaker and component locations will
vary depending on the type of sound
system installed. Four rear speakers are
mounted in the rear side trim panels, two
on each side (one wide band 130 mm
and one tweeter dome).
ART-KT4949
The Harman/Karden system incorporates an additional Subwoofer is
installed in the trunk in the ski bag cover.
The subwoofer is 200 mm diameter
without a subwoofer amplifier. The
amplification for the subwoofer comes
from the main sound system amplifier.
ART-KT5281
The subwoofer is hinged so that it will
swing to the side when the ski bag is
used. A magnet on the subwoofer cover
will hold the subwoofer in place against
the rear bulkhead while the ski bag is
being used.
The subwoofer will continue to function
in either position closed/open.
As mentioned , with the Harman/Karden
ART-KT5280
system, the stereophonic sound is modified when the top is lowered. The sound system amplifier receives a signal from the rear
window defroster relay when the top is lowered to switch the stereophonic sound off.
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ANTENNAS/DIVERSITY
Purpose of the System:
The E46iC is equipped with a diversity antenna system to provide the sound system with
the strongest possible radio station signal to receive the best performance possible from
the sound system.
Components of the System:
The Diversity antenna system on the E46iC consists of:
•
•
•
•
•
Main antenna mast - mounted on the left rear fender.
Diversity antenna - mounted in the top storage cover.
Main antenna amplifier - mounted directly below the antenna mast
Auxiliary antenna amplifier - mounted on the top storage cover.
Diversity switching module - mounted below the antenna mast in the trunk.
The telephone antenna is wound around the main antenna mast.
AUXILIARY AMPLIFIER
HR Radio
Telephone
KLR
ZF Radio
ANTENNA AMPLIFIER
SWITCHING MODULE
ART-KT5347
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The second antenna for the FM diversity system is integrated in the convertible top storage cover. The FM2 antenna incorporates a separate amplifier that receives its power
through the antenna lead.
ART-KT-5344
AUXILIARY ANTENNA
AMPLIFIER
ART-ANTEMP
System Operation
Both antennas receive the signals for radio reception. Each signal is amplified by its own
antenna amplifier and the signals are passed two the diversity switching module. The diversity module will lock onto the stronger of the two signals and send it to the radio receiver
for sound system operation.
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DRIVETRAIN
ENGINE
The M52 TU - B25 engine is installed in the E46iC for the first year of production. The
Siemens MS 42 engine management system is used for the engine. The engine carries over
from the Coupe with no changes to the engine or engine management system
ART-KT4941
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MS 42 - I P O
ECM RELAY
CONTROL
KL 15
FUEL PUMP RELAY CONTROL
P
MEMORY POWER
AC COMPRESSOR
RELAY CONTROL
AUX KL 31
MAIN KL 31
ECM
RELAY
OPERATING POWER
SECONDARY AIR INJECTION
AIR PUMP RELAY CONTROL
RADIATOR OUTLET
TEMPERATURE SENSOR
M
RESONANCE-TURBULENCE
INTAKE SYSTEM
AIR
INJ.
SOL.
CRANKSHAFT
POSITION SENSOR
RUN
LOSS
SOL.
INTAKE VANOS SOLENOID
KNOCK
SENSORS
EXHAUST VANOS SOLENOID
M
IDLE CONTROL VALVE
SEQUENTIAL FUEL INJECTOR CONTROL (6X)
BMW
CAMSHAFT POSITION
SENSOR (2)
I/O
MFL BUTTON PAD
IGNITION COILS CONTROL (6X)
SIEMENS
02 SENSOR HEATING
AIRMASS SIGNAL
INTAKE
AIR
TEMP
MS42.0
E46
M52 TU
THROTTLE
POSITION
134 PINS
MDK
PRECAT
(2X)
POSTCAT
(2X)
COMPRESSOR CLUTCH
CLUTCH SWITCH
BRAKE LIGHT SWITCH
BRAKE LIGHT TEST SWITCH
ENGINE TEMPERATURE
OUTPUT STAGE
ELECTRIC FAN
INTAKE JET PUMP SOLENOID VALVE
PURGE VALVE CONTROL
OIL TEMP
SENSOR
IGNITION MONITOR
SERVICE
ENGINE SOON
CAN
E46
IHKA K-BUS
CAN
THROTTLE
POSITION
(DK)
TCM
DSC
VEHICLE SPEED INPUT
DSC
MDK
MOTOR DRIVEN THROTTLE VALVE
ROLLING CODE
MAP-CONTROLLED
HEATED THERMOSTAT
PRE & POST
CAT CONV.
O2 SENSOR
MONITORING
2X
DIAGNOSIS
iC
2X
+
LEAKAGE DIAGNOSIS
PUMP
MoD
+ LEAKAGE DIAGNOSIS PUMP
MoDiC
DIS
ART-E46ICIPO
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SUSPENSION SYSTEMS
FRONT SUSPENSION
The single ball joint, strut axle front suspension carries over from the E46 Coupe.It includes
the following features:
•
•
•
•
•
Forged aluminum lower control arms.
Hydraulic bushings on the rear control arm mount.
Hollow strut piston rods.
Steering knuckles - press fit to the strut tubes.
Aluminum brake dust shields for weight reduction.
ART-KT-4945
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SUSPENSION SYSTEMS
REAR SUSPENSION
The sub-frame and “C” arm type rear suspension carry over from the E46 Coupe. The
springs and shock absorbers are adapted for the weight of the convertible.
ART-KT-4937
A sport suspension is available as an option. The vehicle is lowered by 15mm with the
sports suspension and the springs, shocks and stabilizer bars are tuned specifically for the
sports option.
The final drive (Compact HAG 188K) is also carried over from the Coupe.
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BRAKES
The dual circuit (black/white) distribution system continues to be used for optimized braking response and performance. single piston floating calipers are used front and rear.
FRONT BRAKE ROTORS - 300 mm diameter by 20 mm thick - vented
REAR BRAKE ROTORS - 294 mm diameter by 19 mm thick - vented
ART-BRAKE
ART-BRALES
SLIP CONTROL SYSTEM
The Teves DSC system is used on the E46iC.
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REVIEW QUESTIONS
1. What change was incorporated into the battery and battery box for usage in the E46iC?
_____________________________________________________________________________
2. What changes have occurred to the Power Window operation for the E46iC?
_____________________________________________________________________________
_____________________________________________________________________________
3. What changes have occurred to the Central Locking function on the E46iC?
____________________________________________________________________________
____________________________________________________________________________
4. What type of signal is produced by the SDR module for the DWA system?
____________________________________________________________________________
5. What is the purpose of the two relays on the rear defogger circuit of the E46iC?
_____________________________________________________________________________
_____________________________________________________________________________
6. Describe the diversity antenna system on the E46iC?
_____________________________________________________________________________
_____________________________________________________________________________
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