05–534
DIAGNOSTICS
–
SUPPLEMENTAL RESTRAINT SYSTEM
DTC
B1156/15 FRONT AIRBAG SENSOR (RH)
MALFUNCTION
DTC
B1157/15 FRONT AIRBAG SENSOR (RH)
MALFUNCTION
05DN0–01
CIRCUIT DESCRIPTION
The airbag front RH sensor circuit consists of the airbag sensor assy center and airbag front RH sensor.
DTC B1156/15 or B1157/15 is recorded when a malfunction is detected in the airbag front RH sensor circuit.
DTC No.
B1156/15
B1157/15
DTC Detecting Condition
Short circuit in airbag front RH sensor wire harness (to
B+)
Short circuit in airbag front RH sensor wire harness (to
ground)
Short circuit between +SR wire harness and –SR wire
harness of airbag front RH sensor
Open circuit in +SR wire harness or –SR wire harness of
airbag front RH sensor
Airbag front RH sensor malfunction
Airbag sensor assy center malfunction
Trouble Area
Airbag front RH sensor
Airbag sensor assy center
Instrument panel wire
Engine room main wire
2004 SCION xB REPAIR MANUAL (RM1031U)
Author:
Date:
694
05–535
DIAGNOSTICS
–
SUPPLEMENTAL RESTRAINT SYSTEM
WIRING DIAGRAM
F2
Airbag Front RH Sensor
+SR
–SR
Airbag Sensor Assy Center
B–W
2
IA3
B–W
9
A10 +SR
BR–W
1
IA3
BR–W
20
A10 –SR
2
1
H02750
2004 SCION xB REPAIR MANUAL (RM1031U)
Author:
Date:
695
05–536
DIAGNOSTICS
–
SUPPLEMENTAL RESTRAINT SYSTEM
INSPECTION PROCEDURE
1
CHECK FRONT AIRBAG SENSOR (RH) CIRCUIT (TO B+)(AIRBAG SENSOR ASSY
CENTER – AIRBAG FRONT RH SENSOR)
Airbag
Front RH
Sensor F
E
DC
B
Airbag
Sensor
A
Assy
Center
(a)
(b)
(c)
(d)
A10
(e)
+SR
–SR
H03355
C81408
H40069
Turn the ignition switch to the LOCK position.
Disconnect the negative (–) terminal cable from the battery, and wait for at least 90 seconds.
Disconnect the connectors between the airbag sensor
assy center and the airbag front RH sensor.
Connect the negative (–) terminal cable to the battery,
and wait for at least 2 seconds.
Measure the voltage according to the value(s) in the table
below.
Standard:
Tester connection
(Connector ”B”)
Condition
Specified condition
A10–9 (+SR) –
Body ground
Ignition switch ON
Below 1 V
A10–20 (–SR) –
Body ground
Ignition switch ON
Below 1 V
NG
Go to step 7
OK
2
CHECK FRONT AIRBAG SENSOR (RH) CIRCUIT (TO GROUND)(AIRBAG SENSOR
ASSY – AIRBAG FRONT RH SENSOR)
Airbag
Front RH
Sensor F
E
DC
B
Airbag
Sensor
A
Assy
Center
A10
+SR
(a)
(b)
(c)
Turn the ignition switch to the LOCK position.
Disconnect the negative (–) terminal cable from the battery, and wait for at least 90 seconds.
Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connection
(Connector ”B”)
Condition
Specified condition
A10–9 (+SR) –
Body ground
Always
1 MΩ or Higher
A10–20 (–SR) –
Body ground
Always
1 MΩ or Higher
–SR
H03355
C81408
H40069
NG
Go to step 8
OK
2004 SCION xB REPAIR MANUAL (RM1031U)
Author:
Date:
696
05–537
DIAGNOSTICS
3
–
SUPPLEMENTAL RESTRAINT SYSTEM
CHECK FRONT AIRBAG SENSOR (RH) CIRCUIT (SHORT)(AIRBAG SENSOR
ASSY CENTER – AIRBAG FRONT RH SENSOR)
(a)
Airbag
Front RH
Sensor F
E
DC
B
Airbag
Sensor
A
Assy
Center
A10
Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connection
(Connector ”B”)
Condition
Specified condition
A10–9 (+SR) –
A10–20 (–SR)
Always
1 MΩ or Higher
+SR
–SR
H03355
C81408
H40069
NG
Go to step 9
OK
4
CHECK FRONT AIRBAG SENSOR (RH) CIRCUIT (OPEN)(AIRBAG SENSOR ASSY
CENTER – AIRBAG FRONT RH SENSOR)
(a)
Airbag
Front RH
Sensor
F E
DC
B
A10
F2
–SR
H03353
H43355 C81408
Airbag
Sensor
A
assy
Center
+SR
Service Wire
+SR
Using a service wire, connect terminals +SR and –SR of
connector ”E”.
NOTICE:
Do not forcibly insert a service wire into the terminals of the
connector when connecting.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connection
(Connector ”B”)
Condition
Specified condition
A10–9 (+SR) –
A10–20 (–SR)
Always
Below 1 Ω
–SR
H43361
NG
Go to step 10
OK
2004 SCION xB REPAIR MANUAL (RM1031U)
Author:
Date:
697
05–538
DIAGNOSTICS
5
–
SUPPLEMENTAL RESTRAINT SYSTEM
INSPECT AIR BAG FRONT RH SENSOR
(a)
Airbag Front RH Sensor Side:
+SR
Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connection
Condition
Specified condition
+SR – –SR
Always
738 to 902 Ω
–SR
NG
H43356
REPLACE AIR BAG FRONT RH SENSOR
OK
6
CHECK AIR BAG SENSOR ASSY CENTER
(a)
Airbag
Front RH
Sensor
Airbag
Sensor
Assy
Center
(b)
(c)
(d)
DLC3
CG
DTC B1156/B1157/15
(g)
TC
H02757
H10600 H01063
(e)
(f)
H40072
Connect the connectors to the airbag front RH sensor and
the airbag sensor assy center.
Connect the negative (–) terminal cable to the battery,
and wait for at least 2 seconds.
Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
Clear the stored DTCs in the memory (See page
05–453).
Turn the ignition switch to the LOCK position.
Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
Check the DTCs (See page 05–453).
OK:
DTC B1156/15 or B1157/15 is not output.
HINT:
Codes other than code B1156/15 or B1157/15 may be output
at this time, but they are not related to this check.
NG
REPLACE AIR BAG SENSOR ASSY CENTER
OK
USE SIMULATION METHOD TO CHECK
2004 SCION xB REPAIR MANUAL (RM1031U)
Author:
Date:
698
05–539
DIAGNOSTICS
7
–
SUPPLEMENTAL RESTRAINT SYSTEM
CHECK ENGINE ROOM MAIN WIRE (TO B+)(CONNECTOR – AIRBAG FRONT RH
SENSOR)
Instrument Panel Wire
Airbag
Front RH
Sensor F
E
D C
B
Airbag
Sensor
A
Assy
Center
(a)
(b)
(c)
(d)
Engine Room
Main Wire
IA3
(e)
–SR
+SR
H41804
Turn the ignition switch to the LOCK position.
Disconnect the negative (–) terminal cable from the battery, and wait for at least 90 seconds.
Disconnect the engine room main wire connector from the
instrument panel wire.
Connect the negative (–) terminal cable to the battery,
and wait for at least 2 seconds.
Measure the voltage according to the value(s) in the table
below.
Standard:
Tester connection
(Connector ”D”)
Condition
Specified condition
IA3–2 (+SR) –
Body ground
Ignition switch ON
Below 1 V
IA3–1 (–SR) –
Body ground
Ignition switch ON
Below 1 V
NG
REPAIR OR REPLACE ENGINE ROOM MAIN
WIRE
OK
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
8
CHECK ENGINE ROOM MAIN WIRE (TO GROUND)(CONNECTOR – AIRBAG
FRONT RH SENSOR)
(a)
Instrument Panel Wire
Airbag
Front RH
Sensor F
E
Engine Room
Main Wire
+SR
D C
B
Airbag
Sensor
A
Assy
Center
IA3
–SR
(b)
Disconnect the engine room main wire connector from the
instrument panel wire.
Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connection
(Connector ”D”)
Condition
Specified condition
IA3–2 (+SR) –
Body ground
Always
1 MΩ or Higher
IA3–1 (–SR) –
Body ground
Always
1 MΩ or Higher
H41804
NG
REPAIR OR REPLACE ENGINE ROOM MAIN
WIRE
OK
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
2004 SCION xB REPAIR MANUAL (RM1031U)
Author:
Date:
699
05–540
DIAGNOSTICS
9
–
SUPPLEMENTAL RESTRAINT SYSTEM
CHECK ENGINE ROOM MAIN WIRE (SHORT)(CONNECTOR – AIRBAG FRONT RH
SENSOR)
(a)
Instrument Panel Wire
Airbag
Front RH
Sensor F
E
D C
Engine Room
Main Wire
B
Airbag
Sensor
A
Assy
Center
(b)
IA3
Disconnect the engine room main wire connector from the
instrument panel wire.
Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connection
(Connector ”D”)
Condition
Specified condition
IA3–2 (+SR) –
IA3–1 (–SR)
Always
1 MΩ or Higher
–SR
+SR
H41804
NG
REPAIR OR REPLACE ENGINE ROOM MAIN
WIRE
OK
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
10
CHECK ENGINE ROOM MAIN WIRE (OPEN)(CONNECTOR – AIRBAG FRONT RH
SENSOR)
Instrument Panel Wire
Engine Room Main Wire
Airbag
Front RH
Sensor
–SR
F E
F2
D C
B
IA3
+SR
Service Wire
Airbag
Sensor
A
Assy
Center
+SR
(a)
Disconnect the engine room main wire connector from the
instrument panel wire.
HINT:
Terminals +SR and –SR of connector ”E” have already been
connected each other using the service wire.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connection
(Connector ”D”)
Condition
Specified condition
IA3–2 (+SR) –
IA3–1 (–SR)
Always
Below 1 Ω
–SR
H43362
NG
REPAIR OR REPLACE ENGINE ROOM MAIN
WIRE
OK
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
2004 SCION xB REPAIR MANUAL (RM1031U)
Author:
Date:
700