B1000

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1000/31: Center Airbag Sensor Assembly Malfunction
B1000/31 - Center Airbag Sensor Assembly Malfunction

DESCRIPTION

The center airbag sensor assembly consists of the airbag sensor, the safing sensor, the drive circuit, the diagnosis circuit, the ignition control, etc.

If the center airbag sensor assembly receives signals from the airbag sensor, it determines whether or not the SRS should be activated.

DTC B1000/31 is recorded when a malfunction is detected in the center airbag sensor assembly.





HINT
When a malfunction code is displayed simultaneously with B1000/31, repair the malfunction indicated by this code (except B1000/31) first.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (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 connectors from the center airbag sensor assembly and the front airbag sensor LH.

(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.

Voltage:





NG -- CHECK ENGINE ROOM MAIN WIRE (SHORT TO B+)
OK -- Continue to next step.

2. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT)

(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.

Resistance:





NG -- CHECK ENGINE ROOM MAIN WIRE (SHORT)
OK -- Continue to next step.

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

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





Resistance:





NG -- CHECK ENGINE ROOM MAIN WIRE (SHORT TO GROUND)
OK -- Continue to next step.

4. CHECK FRONT AIRBAG SENSOR RH CIRCUIT (SHORT TO B+)

(a) Disconnect the connector from the front airbag sensor RH.





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

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

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

Voltage:





NG -- CHECK ENGINE ROOM MAIN WIRE (SHORT TO B+)
OK -- Continue to next step.

5. CHECK FRONT AIRBAG SENSOR RH CIRCUIT (SHORT)

(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.

Resistance:





NG -- CHECK ENGINE ROOM MAIN WIRE (SHORT)
OK -- Continue to next step.

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

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





Resistance:





NG -- CHECK ENGINE ROOM MAIN WIRE (SHORT TO GROUND)
OK -- Continue to next step.

7. CHECK CENTER AIRBAG SENSOR ASSEMBLY

(a) Connect the connectors to the center airbag sensor assembly, front airbag sensor LH and RH.





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

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

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

(e) Turn the engine switch off.

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

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

OK:

DTC B1000/31 is not output.

NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY

OK -- USE SIMULATION METHOD TO CHECK

8. CHECK ENGINE ROOM MAIN 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 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 engine switch on (IG).

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

Voltage:





NG -- REPAIR OR REPLACE ENGINE ROOM MAIN WIRE

OK -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE

9. CHECK ENGINE ROOM MAIN WIRE (SHORT)

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





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

Resistance:





NG -- REPAIR OR REPLACE ENGINE ROOM MAIN WIRE

OK -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE

10. CHECK ENGINE ROOM MAIN WIRE (SHORT TO GROUND)

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





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

Resistance:





NG -- REPAIR OR REPLACE ENGINE ROOM MAIN WIRE

OK -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE

11. CHECK ENGINE ROOM MAIN 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 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 engine switch on (IG).

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

Voltage:





NG -- REPAIR OR REPLACE ENGINE ROOM MAIN WIRE

OK -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE

12. CHECK ENGINE ROOM MAIN WIRE (SHORT)

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





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

Resistance:





NG -- REPAIR OR REPLACE ENGINE ROOM MAIN WIRE

OK -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE

13. CHECK ENGINE ROOM MAIN WIRE (SHORT TO GROUND)

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





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

Resistance:





NG -- REPAIR OR REPLACE ENGINE ROOM MAIN WIRE

OK -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE