B1615

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1615/14: Front Airbag Sensor LH Circuit Malfunction

DTC B1615/14 - Front Airbag Sensor LH Circuit Malfunction

DESCRIPTION

The front airbag sensor LH consists of parts including the diagnostic circuit and the frontal deceleration sensor.
When the center airbag sensor assembly receives signals from the frontal deceleration sensor, it determines whether or not the SRS should be activated.
DTC B1615/14 is set when a malfunction is detected in the front airbag sensor LH circuit.






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE: In order to prevent unexpected airbag deployment, disconnect the following connectors before inspecting parts such as wire harnesses, if the application of tester probes to the center airbag sensor assembly connector is necessary.

1. Turn the ignition switch to the lock position.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Disconnect the connector from the center airbag sensor assembly.
4. Disconnect the connectors from the steering pad.
5. Disconnect the connectors from the front passenger airbag assembly.
6. Disconnect the connector from the front seat outer belt assembly LH.
7. Disconnect the connector from the front seat outer belt assembly RH.
HINT: Skip the following steps if side and curtain shield airbags are not fitted.

8. Disconnect the connector from the front seat side airbag assembly LH.
9. Disconnect the connector from the front seat side airbag assembly RH.
10. Disconnect the connector from the curtain shield airbag assembly LH.
11. Disconnect the connector from the curtain shield airbag assembly RH.

PROCEDURE

1. CHECK DTC




(a) Turn the ignition switch on, and wait for at least 60 seconds.
(b) Clear the DTCs stored in the memory DTC Check / Clear.
(c) Turn the ignition switch off.
(d) Turn the ignition switch on, and wait for at least 60 seconds.
(e) Check the DTCs DTC Check / Clear.
OK:
DTC B1615/14 is not output.
HINT: DTCs other than DTC B1615/14 may be output at this time, but they are not related to this check.

OK -- USE SIMULATION METHOD TO CHECK
NG -- Continue to next step.
2. CHECK CONNECTION OF CONNECTORS
(a) Turn the ignition switch off.
(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 front airbag sensor LH.
OK:
The connectors are properly connected.
NG -- CONNECT CONNECTORS
OK -- Continue to next step.
3. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (FOR OPEN)




(a) Disconnect the connectors from the center airbag sensor assembly and the front airbag sensor LH.
(b) Using a service wire, connect A12-1 and A12-2 of connector E.
NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting.
(c) Measure the resistance.
Standard resistance:






NG -- CHECK ENGINE ROOM MAIN WIRE (FOR OPEN)
OK -- Continue to next step.
4. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (FOR SHORT)




(a) Disconnect the service wire from connector E.
(b) Measure the resistance.
Standard resistance:






NG -- CHECK ENGINE ROOM MAIN WIRE (FOR SHORT)
OK -- Continue to next step.
5. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (TO B+)




(a) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(b) Turn the ignition switch on.
(c) Measure the voltage.
Standard voltage:






NG -- CHECK ENGINE ROOM MAIN WIRE (TO B+)
OK -- Continue to next step.
6. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (TO GROUND)




(a) Turn the ignition switch off.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Measure the resistance.
Standard resistance:






NG -- CHECK ENGINE ROOM MAIN WIRE (TO GROUND)
OK -- Continue to next step.
7. CHECK FRONT AIRBAG SENSOR LH




(a) Connect the connectors to the center airbag sensor assembly.
(b) Interchange the front 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 on, and wait for at least 60 seconds.
(e) Clear the DTCs stored in the memory DTC Check / Clear.
(f) Turn the ignition switch off.
(g) Turn the ignition switch on, and wait for at least 60 seconds.
(h) Check the DTCs DTC Check / Clear.
Result:





HINT: DTCs other than DTC B1610/13 and B1615/14 may be output at this time, but they are not related to this check.

B -- REPLACE FRONT AIRBAG SENSOR LH
A -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
C -- USE SIMULATION METHOD TO CHECK
8. CHECK ENGINE ROOM MAIN WIRE (FOR OPEN)




(a) Disconnect the engine room main wire connector from the instrument panel wire.
HINT: The service wire has already been inserted into connector E.
(b) Measure the resistance.
Standard resistance:






NG -- REPAIR OR REPLACE ENGINE ROOM MAIN WIRE
OK -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE
9. CHECK ENGINE ROOM MAIN WIRE (FOR SHORT)




(a) Disconnect the service wire from connector E.
(b) Measure the resistance.
Standard resistance:






NG -- REPAIR OR REPLACE ENGINE ROOM MAIN WIRE
OK -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE
10. CHECK ENGINE ROOM MAIN WIRE (TO B+)




(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) Disconnect the engine room main wire connector from the instrument panel wire.
(d) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(e) Turn the ignition switch on.
(f) Measure the voltage.
Standard voltage:






NG -- REPAIR OR REPLACE ENGINE ROOM MAIN WIRE
OK -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE
11. CHECK ENGINE ROOM MAIN WIRE (TO GROUND)




(a) Disconnect the engine room main wire connector from the instrument panel wire.
(b) Measure the resistance.
Standard resistance:






NG -- REPAIR OR REPLACE ENGINE ROOM MAIN WIRE
OK -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE