Front Airbag Sensor LH Circuit Malfunction - Airbag System

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

DESCRIPTION

The front airbag sensor LH consists of the diagnostic circuit and the frontal deceleration sensor, etc.

If 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 recorded when a malfunction is detected in the front airbag sensor LH circuit.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC

(a) Turn the engine switch on (IG), and wait for at least 60 seconds.





(b) Clear the DTCs stored in the memory Reading and Clearing Diagnostic Trouble Codes.

(c) Turn the engine switch off.

(d) Turn the engine switch on (IG), and wait for at least 60 seconds.

(e) Check the DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B1615/14 is not output.

HINT
Codes other than DTC B1615/14 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 engine 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, THEN GO TO STEP 1
OK -- Continue to next step.

3. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (OPEN)

(a) Disconnect the connectors from the center airbag sensor assembly and the front airbag sensor LH.





(b) Using a service wire, connect J47-30 (+SL) and J47-28 (-SL) of connector "B".

NOTICE:
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:





NG -- CHECK INSTRUMENT PANEL WIRE (OPEN)
OK -- Continue to next step.

4. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT)

(a) Disconnect the service wire from connector "B".





(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- CHECK INSTRUMENT PANEL WIRE (SHORT)
OK -- Continue to next step.

5. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO B+)

(a) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.





(b) Turn the engine switch on (IG).

(c) Measure the voltage according to the value(s) in the table below.

Standard voltage:





NG -- CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)
OK -- Continue to next step.

6. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO GROUND)

(a) Turn the engine switch off.





(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 -- CHECK INSTRUMENT PANEL WIRE (SHORT 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 RH with LH 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 engine switch on (IG), and wait for at least 60 seconds.

(e) Clear the DTCs stored in the memory Reading and Clearing Diagnostic Trouble Codes.

(f) Turn the engine switch off.

(g) Turn the engine switch on (IG), and wait for at least 60 seconds.

(h) Check the DTCs Reading and Clearing Diagnostic Trouble Codes.

Result:





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

A -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY

B -- REPLACE FRONT AIRBAG SENSOR LH

C -- USE SIMULATION METHOD TO CHECK

8. CHECK INSTRUMENT PANEL WIRE (OPEN)

(a) Disconnect the instrument panel wire connector from the engine room main wire.





HINT
The service wire has already been inserted into connector "B".

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE

OK -- REPAIR OR REPLACE ENGINE ROOM MAIN WIRE

9. CHECK INSTRUMENT PANEL WIRE (SHORT)

(a) Disconnect the instrument panel wire connector from the engine room main wire.





(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE

OK -- REPAIR OR REPLACE ENGINE ROOM MAIN WIRE

10. CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)

(a) Turn the engine switch off.





(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

(c) Disconnect the instrument panel wire connector from the engine room main wire.

(d) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(e) Turn the engine switch on (IG).

(f) Measure the voltage according to the value(s) in the table below.

Standard voltage:





NG -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE

OK -- REPAIR OR REPLACE ENGINE ROOM MAIN WIRE

11. CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)

(a) Disconnect the instrument panel wire connector from the engine room main wire.





(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE

OK -- REPAIR OR REPLACE ENGINE ROOM MAIN WIRE