DTC B0001[12] Driver Airbag Circuit Short to Battery Voltage (Air Bag (Driver/Passenger/Side/Roof/Knee/Far Side))

1. SRS system check

Refer to "58.SRS Control 8A.Troubleshooting(Air Bag (Driver/Passenger/Side/Roof/Knee/Far Side)) diagnostic system check-SRS controls".

2. Current DTC check

1) Clear the DTC with a scan tool.

2) Turn OFF the ignition switch for 15 seconds or more.

3) Turn ON the ignition switch.

4) Observe the DTC information with a scan tool for DTC B0001[12] being set as a current failure. Is a DTC set?

Yes

=>Go to Driver airbag circuit check.

Go to Intermittent conditions of SRS control.

Refer to "209.Restraints 22D.Symptom Intermittent conditions of SRS control".

3. Driver airbag circuit check

1) Turn OFF the ignition switch for 15 seconds or more.

2) Disconnect the SRS coil harness connector (B35) on the lower part of the combination switch.

3) Connect the SRS alternative load and the SRS adapter for load tool to the SRS coil harness connector (B35) on the SRS control unit side.

Refer to "LHD SRS airbag (Driver/Passenger/Side/Curtain/Knee)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD SRS airbag (Driver/Passenger/Side/Curtain/Knee)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD SRS airbag (Driver/Passenger/Side/Curtain/Knee/Far Side)" in the ETM (wiring diagram). (Open using the ETM viewer.).

SST: 5-8840-2982-0 - SRS adapter for load tool

SST: 5-8840-2856-0 - SRS alternative load

4) Turn ON the ignition switch.

5) Observe the DTC information with a scan tool for DTC B0001[12] being set as a current failure. Is a DTC set?

Yes

=>Go to Inspection for short to power supply in driver airbag deployment current output (High) circuit.

=>Go to SRS coil check.

4. Inspection for short to power supply in driver airbag deployment current output (High) circuit

1) Turn OFF the ignition switch for 15 seconds or more.

2) Inspect the driver airbag deployment current output (High) circuit between the SRS control unit (pin 6 of B9) and the SRS coil (pin 1 of B35) for a short to the power supply circuit. Is the result normal?

Refer to "LHD SRS airbag (Driver/Passenger/Side/Curtain/Knee)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD SRS airbag (Driver/Passenger/Side/Curtain/Knee)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD SRS airbag (Driver/Passenger/Side/Curtain/Knee/Far Side)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Yes

=>Go to Inspection for short to power supply in driver airbag deployment current output (Low) circuit.

Repair the circuit as necessary.

=>Go to Repair verification.

5. Inspection for short to power supply in driver airbag deployment current output (Low) circuit

1) Inspect the driver airbag deployment current output (Low) circuit between the SRS control unit (pin 7 of B9) and the SRS coil (pin 2 of B35) for a short to the power supply circuit. Is the result normal?

Refer to "LHD SRS airbag (Driver/Passenger/Side/Curtain/Knee)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD SRS airbag (Driver/Passenger/Side/Curtain/Knee)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD SRS airbag (Driver/Passenger/Side/Curtain/Knee/Far Side)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Yes

=>Go to SRS control unit replacement.

Repair the circuit as necessary.

=>Go to Repair verification.

6. SRS coil check

1) Turn OFF the ignition switch for 15 seconds or more.

2) Remove the SRS alternative load and the adapter.

3) Remove the driver airbag.

Refer to "8.Restraints 8B.Airbag Systems driver airbag removal".

4) Connect the SRS alternative load and the appropriate adapter from the adapter harness kit to the driver airbag harness connector.

SST: 5-8840-2857-0 - adapter harness kit

SST: 5-8840-2856-0 - SRS alternative load

5) Connect the SRS coil harness connector (B35) on the lower part of the combination switch.

Refer to "LHD SRS airbag (Driver/Passenger/Side/Curtain/Knee)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD SRS airbag (Driver/Passenger/Side/Curtain/Knee)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD SRS airbag (Driver/Passenger/Side/Curtain/Knee/Far Side)" in the ETM (wiring diagram). (Open using the ETM viewer.).

6) Turn ON the ignition switch.

7) Observe the DTC information with a scan tool for DTC B0001[12] being set as a current failure. Is a DTC set?

Yes

Replace the combination switch.

Refer to "9.Body, Cab, Accessories 9A.Lighting Systems combination switch removal".

Refer to "9.Body, Cab, Accessories 9A.Lighting Systems combination switch installation".

=>Go to Repair verification.

Replace the driver airbag.

Refer to "8.Restraints 8B.Airbag Systems driver airbag removal".

Refer to "8.Restraints 8B.Airbag Systems driver airbag installation".

=>Go to Repair verification.

7. SRS control unit replacement

Note

Perform the VIN programming and ECU lock after replacing the SRS control unit.

Refer to "8.Restraints 8Z.Seat Belt and SRS Airbag Electrical Control SRS control unit removal".

Refer to "8.Restraints 8Z.Seat Belt and SRS Airbag Electrical Control SRS control unit installation".

Refer to "8.Restraints 8Z.Seat Belt and SRS Airbag Electrical Control SRS control unit setting".

Procedure completion

=>Go to Repair verification.

8. Repair verification

1) Reconnect all of the disconnected harness connectors.

2) Clear the DTC with a scan tool.

3) Turn OFF the ignition switch for 15 seconds or more.

4) Turn ON the ignition switch.

5) Observe the DTC information with a scan tool.