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 deceleration sensor, the safing sensor, the drive circuit, the diagnostic circuit, the ignition control, etc.

If the center airbag sensor assembly receives signals from the airbag sensor, it determines whether the airbags should deployed and pretensioner squibs activated.

DTC B1000/31 is stored when a malfunction is detected in the center airbag sensor assembly, front airbag sensor RH circuit or front airbag sensor LH circuit.





WIRING DIAGRAM





INSPECTION PROCEDURE

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

PROCEDURE

1. CHECK CONNECTORS

(a) Turn the ignition switch off.

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

(c) Check that the connectors are properly connected to the center airbag sensor assembly, front airbag sensor RH and front airbag sensor LH. Also check that the connectors that link the engine room main wire and instrument panel wire are properly connected.

OK:

The connectors are properly connected.

HINT
If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

(d) Disconnect the connectors from the center airbag sensor assembly, front airbag sensor RH and front airbag sensor LH. Also disconnect the connectors that link the engine room main wire and instrument panel wire.

(e) Check that the terminals of connectors are not damaged.

OK:

The terminals are not deformed or damaged.

NG -- REPLACE WIRE HARNESS
OK -- Continue to next step.

2. CHECK FRONT AIRBAG SENSOR RH CIRCUIT (OPEN)

(a) Connect the connectors that link the engine room main wire and instrument panel wire.





(b) Using a service wire, connect terminals A5-2 (+SR) and A5-1 (-SR) of connector E.

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 ENGINE ROOM MAIN WIRE (OPEN)
OK -- Continue to next step.

3. CHECK FRONT AIRBAG SENSOR RH CIRCUIT (SHORT)

(a) Disconnect the service wire from connector E.





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

Standard Resistance:





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

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

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





(b) Turn the ignition switch to ON.

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

Standard Voltage:





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

5. CHECK FRONT AIRBAG SENSOR RH CIRCUIT (SHORT 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 according to the value(s) in the table below.

Standard Resistance:





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

6. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (OPEN)

(a) Connect the connectors that link the engine room main wire and instrument panel wire.





(b) Using a service wire, connect terminals A4-2 (+SL) and A4-1 (-SL) of connector E.

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 ENGINE ROOM MAIN WIRE (OPEN)
OK -- Continue to next step.

7. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT)

(a) Disconnect the service wire from connector E.





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

Standard Resistance:





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

8. 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 ignition switch to ON.

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

Standard Voltage:





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

9. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT 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 according to the value(s) in the table below.

Standard Resistance:





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

10. CHECK CENTER AIRBAG SENSOR ASSEMBLY

(a) Connect the connector to the center airbag sensor assembly.

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

(c) Turn the ignition switch to ON, and wait for at least 60 seconds.

(d) Clear the DTCs stored in memory DTC Check / Clear.

(e) Turn the ignition switch off.

(f) Turn the ignition switch to ON, and wait for at least 60 seconds.

(g) Check the DTCs DTC Check / Clear.

Result:





HINT
Codes other than DTC B1000/31, B1610/13 and B1615/14 may be output at this time, but they are not related to this check.

B -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
A -- Continue to next step.

11. CHECK FRONT AIRBAG SENSOR LH

(a) Turn the ignition switch off.

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

(c) Connect the connector to the front airbag sensor LH.

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

(e) Turn the ignition switch to ON, and wait for at least 60 seconds.

(f) Clear the DTCs stored in memory DTC Check / Clear.

(g) Turn the ignition switch off.

(h) Turn the ignition switch to ON, and wait for at least 60 seconds.

(i) Check the DTCs DTC Check / Clear.

Result:





HINT
Codes other than DTC B1000/31 and B1610/13 may be output at this time, but they are not related to this check.

B -- REPLACE FRONT AIRBAG SENSOR LH
A -- Continue to next step.

12. CHECK FRONT AIRBAG SENSOR RH

(a) Turn the ignition switch off.

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

(c) Connect the connector to the front airbag sensor RH.

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

(e) Turn the ignition switch to ON, and wait for at least 60 seconds.

(f) Clear the DTCs stored in memory DTC Check / Clear.

(g) Turn the ignition switch off.

(h) Turn the ignition switch to ON, and wait for at least 60 seconds.

(i) Check the DTCs DTC Check / Clear.

Result:





HINT
Codes other than DTC B1000/31 may be output at this time, but they are not related to this check.

B -- REPLACE FRONT AIRBAG SENSOR RH

A -- USE SIMULATION METHOD TO CHECK

13. CHECK ENGINE ROOM MAIN WIRE (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 according to the value(s) in the table below.

Standard Resistance:





NG -- REPLACE ENGINE ROOM MAIN WIRE

OK -- REPLACE INSTRUMENT PANEL WIRE

14. 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.

Standard Resistance:





NG -- REPLACE ENGINE ROOM MAIN WIRE

OK -- REPLACE INSTRUMENT PANEL WIRE

15. CHECK ENGINE ROOM MAIN WIRE (SHORT TO B+)

(a) Turn the ignition 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 ignition switch to ON.

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

Standard Voltage:





NG -- REPLACE ENGINE ROOM MAIN WIRE

OK -- REPLACE INSTRUMENT PANEL WIRE

16. 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.

Standard Resistance:





NG -- REPLACE ENGINE ROOM MAIN WIRE

OK -- REPLACE INSTRUMENT PANEL WIRE

17. CHECK ENGINE ROOM MAIN WIRE (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 according to the value(s) in the table below.

Standard Resistance:





NG -- REPLACE ENGINE ROOM MAIN WIRE

OK -- REPLACE INSTRUMENT PANEL WIRE

18. 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.

Standard Resistance:





NG -- REPLACE ENGINE ROOM MAIN WIRE

OK -- REPLACE INSTRUMENT PANEL WIRE

19. CHECK ENGINE ROOM MAIN WIRE (SHORT TO B+)

(a) Turn the ignition 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 ignition switch to ON.

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

Standard Voltage:





NG -- REPLACE ENGINE ROOM MAIN WIRE

OK -- REPLACE INSTRUMENT PANEL WIRE

20. 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.

Standard Resistance:





NG -- REPLACE ENGINE ROOM MAIN WIRE

OK -- REPLACE INSTRUMENT PANEL WIRE