DTC B0072[1B] Pretensioner(Front Left) Circuit High Resistance (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. Front left side pretensioner circuit resistance check

1) Observe the Pretensioner(Front Left) Loop Resistance parameter on the scan tool. Is the Pretensioner(Front Left) Loop Resistance parameter more than or equal to the specified value?

Value: 7 Ω

Yes (Except extend cab models)

=>Go to Connection check for front left side pretensioner harness connector.

Yes (Extend cab models)

=>Go to Intermediate harness connector connection check.

Go to Intermittent conditions of SRS control.

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

3. Intermediate harness connector connection check

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

2) Verify that the intermediate harness connector (H39) is securely connected. Is the intermediate harness connector (H39) securely connected?

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 Intermediate harness connector inspection.

Securely connect the intermediate harness connector (H39).

=>Go to Repair verification.

4. Intermediate harness connector inspection

1) Disconnect the intermediate harness connector (H39).

2) Inspect the intermediate harness connector terminals (pins 2 and 3 of H39) for bending, dirt, etc. 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 Current DTC check.

Repair the connections as necessary.

=>Go to Repair verification.

5. Current DTC check

1) Connect the intermediate harness connector (H39).

2) Turn ON the ignition switch.

3) Observe the DTC information with a scan tool for DTC B0072[1B] being set as a current failure. Is a DTC set?

Yes

=>Go to Connection check for front left side pretensioner harness connector.

=>Go to Repair verification.

6. Connection check for front left side pretensioner harness connector

1) Verify that the front left side pretensioner harness connector (R19 or D29) is securely connected. Is the front left side pretensioner harness connector (R19 or D29) securely connected?

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 Front left side pretensioner harness connector inspection.

Securely connect the front left side pretensioner harness connector (R19 or D29).

=>Go to Repair verification.

7. Front left side pretensioner harness connector inspection

1) Disconnect the front left side pretensioner harness connector (R19 or D29).

2) Inspect the front left side pretensioner harness connector terminals (pins 1 and 2 of R19 or D29) for bending, dirt, etc. 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 Current DTC follow-up check.

Repair the connections as necessary.

=>Go to Repair verification.

8. Current DTC follow-up check

1) Connect the front left side pretensioner harness connector (R19 or D29).

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.).

2) Turn ON the ignition switch.

3) Observe the DTC information with a scan tool for DTC B0072[1B] being set as a current failure. Is a DTC set?

Yes

=>Go to Front left side pretensioner circuit check.

=>Go to Repair verification.

9. Front left side pretensioner circuit check

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

2) Disconnect the front left side pretensioner harness connector (R19 or D29).

3) Connect the SRS alternative load and the appropriate adapter from the adapter harness kit to the front left side pretensioner harness connector (R19 or D29).

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

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 B0072[1B] being set as a current failure. Is a DTC set?

Yes

=>Go to Inspection for open circuit in front left side pretensioner ignition current output (High) circuit.

Replace the front left side seat belt with pretensioner.

Refer to "8.Restraints 8C.Seat Belt Systems front tongue side seat belt (with pretensioner) (regular cab) removal".

Refer to "8.Restraints 8C.Seat Belt Systems front tongue side seat belt (with pretensioner) (regular cab) installation".

Refer to "8.Restraints 8C.Seat Belt Systems front tongue side seat belt (with pretensioner) (crew cab) removal".

Refer to "8.Restraints 8C.Seat Belt Systems front tongue side seat belt (with pretensioner) (crew cab) installation".

Refer to "8.Restraints 8C.Seat Belt Systems front tongue side seat belt (with pretensioner) (extend cab) removal".

Refer to "8.Restraints 8C.Seat Belt Systems front tongue side seat belt (with pretensioner) (extend cab) installation".

=>Go to Repair verification.

10. Inspection for open circuit in front left side pretensioner ignition current output (High) circuit

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

2) Inspect the front left side pretensioner ignition current output (High) circuit between the SRS control unit (pin 9 of R7) and the front left side pretensioner (pin 2 of R19 or D29) for an open circuit or high resistance. 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 open circuit in front left side pretensioner ignition current output (Low) circuit.

Repair the circuit as necessary.

=>Go to Repair verification.

11. Inspection for open circuit in front left side pretensioner ignition current output (Low) circuit

1) Inspect the front left side pretensioner ignition current output (Low) circuit between the SRS control unit (pin 8 of R7) and the front left side pretensioner (pin 1 of R19 or D29) for an open circuit or high resistance. 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 harness connector inspection.

Repair the circuit as necessary.

=>Go to Repair verification.

12. SRS control unit harness connector inspection

1) Inspect for poor connections at the SRS control unit harness connector (pins 8 and 9 of R7). 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 connections as necessary.

=>Go to Repair verification.

13. 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.

14. 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.