DTC B1156/15 Front Airbag Sensor (RH) Malfunction DTC B1157/15 Front Airbag Sensor (RH) Malfunction
DTC B1156/15 Front Airbag Sensor (RH) Malfunction DTC B1157/15 Front Airbag Sensor (RH) Malfunction
DTC B1156/15 Front Airbag Sensor (RH) Malfunction DTC B1157/15 Front Airbag Sensor (RH) Malfunction
CIRCUIT DESCRIPTION
The airbag front RH sensor circuit consists of the airbag sensor assy center and airbag front RH sensor.
DTC B1156/B1157/15 is recorded when a malfunction is detected in the airbag front RH sensor circuit.
DTC No. DTC Detecting Condition Trouble Area
Airbag front RH sensor
Airbag sensor assy center
B1156/B1157/15 Airbag front RH sensor malfunction
Instrument panel wire
Engine room main wire
WIRING DIAGRAM
A6
Airbag Front RH Sensor Airbag Sensor Assy Center
1 9
B–W B–W
+SR IA1 A13 +SR
2
2 20
BR–W BR–W
–SR IA1 A13 –SR
1
H02750
INSPECTION PROCEDURE
1 CHECK FRONT AIRBAG SENSOR (RH) CIRCUIT (TO B+)(AIRBAG SENSOR ASSY
CENTER – AIRBAG FRONT RH SENSOR)
(a) Disconnect the negative (–) terminal cable from the bat-
Airbag tery, and wait at least for 90 seconds.
Airbag
Sensor (b) Disconnect the connectors between the airbag front RH
Front RH
Sensor Assy sensor and the airbag sensor assy center.
Center (c) Connect the negative (–) terminal cable to the battery,
and wait at least for 2 seconds.
(d) Turn the ignition switch to ON.
+SR (e) For the connector (on the airbag sensor assy center side)
between the airbag front RH sensor and the airbag sen-
sor assy center, measure the voltage between body
ground and each of +SR and –SR.
–SR OK:
Voltage: Below 1 V
H03355
C81408 H40069
NG Go to step 6
OK
–SR
H03355
C81408 H40069
NG Go to step 7
OK
SST 09843–18040
(a) Using a service wire, connect +SR and –SR of the con-
Airbag nector (on the airbag front RH sensor side) between the
Airbag Sensor airbag front RH sensor and the airbag sensor assy center.
Front RH
Assy (b) For the connector (on the airbag sensor assy center side)
Sensor
Center between the airbag front RH sensor and the airbag sen-
sor assy center, measure the resistance between +SR
and –SR.
OK:
+SR
Resistance: Below 1 Ω
–SR
H03353
H08016 C81408 H41800
NG Go to step 8
OK
+SR –SR
OK
SST 09843–18040
(a) Disconnect the negative (–) terminal cable from the bat-
tery, and wait at least for 90 seconds.
Airbag
Airbag (b) Connect the airbag front RH sensor connector and airbag
Sensor
Front RH sensor assy center connector.
Sensor Assy
Center (c) Connect the negative (–) terminal cable to the battery,
and wait at least for 2 seconds.
(d) Turn the ignition switch to ON, and wait at least for 20 se-
conds.
DLC3 DTC B1156/B1157/15
(e) Clear the DTC stored in memory (See page 05–424).
(f) Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(g) Turn the ignition switch to ON, and wait at least for 20 se-
CG Tc
conds.
H02757 (h) Check the DTC (See page 05–424).
H10600 H01063 H40072
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 AIR BAG SENSOR ASSY CENTER
OK
OK
–SR +SR
H41804
NG REPAIR OR REPLACE ENGINE ROOM MAIN
WIRE
OK
SST 09843–18040
Engine Room (a) Disconnect the connectors between the engine room
Main Wire main wire and the instrument panel wire.
Airbag (b) Using a service wire, connect +SR and –SR of the engine
Airbag
Sensor
Front room main wire connector (on the airbag front RH sensor
Assy
RH Sensor side) between the airbag sensor assy center and the air-
Center
bag front RH sensor.
(c) For the engine room main wire connector (on the airbag
sensor assy center side) between the airbag sensor assy
center and the airbag front RH sensor, measure the resis-
tance between the +SR and –SR.
OK:
–SR +SR Resistance: Below 1 Ω
NG REPAIR OR REPLACE ENGINE ROOM MAIN
H41945 WIRE
OK