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DI-443
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
DI58P-04
DTC B1156/B1157/15 Front Airbag Sensor (RH) Malfunction
CIRCUIT DESCRIPTION
The front airbag sensor (RH) circuit consists of the airbag sensor assembly and front airbag sensor (RH).
For details of the function of each component, see OPERATION on page RS-2 .
DTC B1156/B1157/15 is recorded when malfunction is detected in the front airbag sensor (RH) circuit.
DTC No. DTC Detecting Condition Trouble Area
S Front airbag sensor (RH)
S Wire harness
B1156/B1157/15 S Front airbag sensor (RH) malfunction
S Engine room main wire harness
S Airbag sensor assembly
WIRING DIAGRAM
A29
Front Airbag Sensor (RH) Airbag Sensor Assembly
9
B-W
+SR C21 +SR
2
20
BR-W
-SR C21 -SR
1
H02751
2002 4RUNNER (RM887U)
Author : Date : 619
DI-444
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
INSPECTION PROCEDURE
1 Prepare for inspection. (See step 1 on page DI-456 )
2 Check wire harness (to B+).
CHECK:
(a) Turn ignition switch to ON.
Airbag
Sensor
(b) For the connector (on the airbag sensor assembly side)
Assembly between the front airbag sensor (RH) and the airbag sen-
sor assembly, measure the voltage between body ground
Front Airbag
Sensor (RH) Airbag Sensor and each of SR+ and SR-.
Assembly OK:
ON Voltage: Below 1 V
(+) SR+
NG Repair or replace harness or connector be-
(-) tween front airbag sensor (RH) and airbag sen-
SR-
H01370
AB0119
sor assembly.
H03363 H07387
OK
3 Check wire harness (to ground).
CHECK:
For the connector (on the airbag sensor assembly side) be-
Airbag tween the front airbag sensor (RH) and the airbag sensor as-
Sensor sembly, measure the resistance between body ground and
Assembly
each of SR+ and SR-.
Front Airbag OK:
Airbag Sensor
Sensor (RH) Resistance: 1 M or Higher
Assembly
(+) SR+
NG Repair or replace harness or connector be-
tween front airbag sensor (RH) and airbag sen-
(-) SR- sor assembly.
H01370
H03361 H07386
OK
2002 4RUNNER (RM887U)
Author : Date : 620
DI-445
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
4 Check wire harness.
Front Airbag CHECK:
Sensor (RH) For the connector (on the airbag sensor assembly side) be-
Airbag tween the front airbag sensor (RH) and the airbag sensor as-
Sensor
sembly, measure the resistance between SR+ and SR-.
Assembly
OK:
Resistance: 1 M or Higher
Airbag Sensor
Assembly
(+) SR+
(-)
H01370
SR-
H03356 H09170
NG Repair or replace harness or connector be-
tween front airbag sensor (RH) and airbag sen-
sor assembly.
OK
5 Check wire harness.
Front Airbag PREPARATION:
Sensor (RH)
Using a service wire, connect SR+ and SR- of the connector
Airbag (on the front airbag sensor (RH) side) between the airbag sen-
Sensor
sor assembly and the front airbag sensor (RH).
Assembly
CHECK:
For the connector (on the airbag sensor assembly side) be-
Airbag Sensor
Assembly tween the front airbag sensor (RH) and the airbag sensor as-
SR+ SR-
sembly, measure the resistance between SR+ and SR-.
OK:
(+) SR+ Resistance: Below 1
(-)
SR-
H09526
H09521H03356 H09171
NG Repair or replace harness or connector be-
tween front airbag sensor (RH) and airbag sen-
sor assembly.
OK
2002 4RUNNER (RM887U)
Author : Date : 621
DI-446
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
6 Check front airbag sensor (RH).
CHECK:
For the connector (on the front airbag sensor (RH)), measure
Airbag
the resistance between SR+ and SR-.
Sensor OK:
Assembly Resistance: 300 - 1500
Front Airbag
Sensor (RH)
SR+ SR-
H01371 (+) (-) NG Replace front airbag sensor (RH).
H01009 H01155
OK
2002 4RUNNER (RM887U)
Author : Date : 622
DI-447
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
7 Check airbag sensor assembly.
PREPARATION:
Front Airbag
(a) Turn ignition switch to LOCK.
Sensor (RH)
(b) Disconnect negative (-) terminal cable from the battery,
Airbag and wait at least for 90 seconds.
Sensor (c) Connect the front airbag sensor (RH) connector and air-
Assembly
bag sensor assembly connector.
(d) Connect negative (-) terminal cable to the battery, and
wait at least for 2 seconds.
ACC ON
CHECK:
(a) Turn ignition switch to ACC or ON, and wait at least for 20
seconds.
or (b) Clear DTC stored in memory.
DLC1
DTC B1156/B1157/15 (See page DI-377 )
(c) Turn ignition switch to LOCK, and wait at least for 20 se-
conds.
(d) Turn ignition switch to ACC or ON, and wait at least for 20
seconds.
E1 (e) Check DTC.
H01369 TC
AB0118 AB0119
R13006 H01063 H09172 (See page DI-377 )
OK:
DTC B1156/B1157/15 is not output.
HINT:
Codes other than code B1156/B1157/15 may be output at this
time, but they are not relevant to this check.
NG Replace airbag sensor assembly.
OK
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.
2002 4RUNNER (RM887U)
Author : Date : 623
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