B1154

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1154/38: Rear Airbag Sensor RH Circuit Malfunction

DTC B1154/38 - Rear Airbag Sensor RH Circuit Malfunction

DESCRIPTION

The rear airbag sensor RH circuit consists of the safing sensor, the diagnostic circuit and the lateral deceleration sensor, etc.
If the center airbag sensor assembly receives signals from the lateral deceleration sensor, it judges whether or not the SRS should be activated.
DTC B1154/38 is recorded when a malfunction in the rear airbag sensor RH circuit is detected.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC




(a) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(b) Clear the DTCs stored in memory DTC Check / Clear.
(c) Turn the ignition switch to the LOCK position.
(d) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(e) Check the DTCs DTC Check / Clear.
OK:
DTC B1154/38 is not output.
HINT: Codes other than code B1154/38 may be output at this time, but they are not related to this check.

NG -- CHECK CONNECTION OF CONNECTORS
OK -- USE SIMULATION METHOD TO CHECK
2. CHECK CONNECTION OF CONNECTORS
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Check that the connectors are properly connected to the center airbag sensor assembly and the rear airbag sensor RH.
OK:
The connectors are connected.
NG -- CONNECT CONNECTORS, THEN GO TO STEP 1
OK -- Continue to next step.
3. CHECK FLOOR WIRE (OPEN)




(a) Disconnect the connectors from the center airbag sensor assembly and the rear airbag sensor RH.
(b) Using a service wire, connect A29-19 (VUCR) and A29-20 (ESCR) of connector "B".
NOTE:
Do not forcibly insert a service wire into the terminals of the connector when connecting.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:









(d) Using a service wire, connect A29-18 (CSR+) and A29-4 (CSR-) of connector "B".
NOTE:
Do not forcibly insert a service wire into the terminals of the connector when connecting.
(e) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- Continue to next step.
4. CHECK FLOOR WIRE (SHORT TO B+)




(a) Disconnect the service wire from connector "B".
(b) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(c) Turn the ignition switch to the ON position.
(d) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- Continue to next step.
5. CHECK FLOOR WIRE (SHORT TO GROUND)




(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- Continue to next step.
6. CHECK FLOOR WIRE (SHORT)




(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- Continue to next step.
7. CHECK REAR AIRBAG SENSOR RH




(a) Connect the connector to the center airbag sensor assembly.
(b) Interchange the rear airbag sensor LH with RH and connect the connectors to them.
(c) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(d) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(e) Clear the DTCs stored in memory DTC Check / Clear.
(f) Turn the ignition switch to the LOCK position.
(g) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(h) Check the DTCs DTC Check / Clear.
Result:






NG:B -- REPLACE REAR AIRBAG SENSOR RH
NG:A -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
OK -- USE SIMULATION METHOD TO CHECK