DTC B0073[1B] Pretensioner(Rear 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. Rear left side pretensioner circuit resistance check

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

Value: 7 Ω

Yes

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

Go to Intermittent conditions of SRS control.

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

3. Connection check for rear left side pretensioner harness connector

1) Verify that the rear left side pretensioner harness connector (R61) is securely connected. Is the rear left side pretensioner harness connector (R61) securely connected?

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 Rear left side pretensioner harness connector inspection.

Securely connect the rear left side pretensioner harness connector (R61).

=>Go to Repair verification.

4. Rear left side pretensioner harness connector inspection

1) Disconnect the rear left side pretensioner harness connector (R61).

2) Inspect the rear left side pretensioner harness connector terminals (pins 1 and 2 of R61) for bending, dirt, etc. Is the result normal?

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 rear left side pretensioner harness connector (R61).

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 B0073[1B] being set as a current failure. Is a DTC set?

Yes

=>Go to Rear left side pretensioner circuit check.

=>Go to Repair verification.

6. Rear left side pretensioner circuit check

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

2) Disconnect the rear left side pretensioner harness connector (R61).

3) Connect the SRS alternative load and the appropriate adapter from the adapter harness kit to the rear left side pretensioner harness connector (R61).

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 B0073[1B] being set as a current failure. Is a DTC set?

Yes

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

Replace the rear left side seat belt with pretensioner.

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

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

=>Go to Repair verification.

7. Inspection for open circuit in rear left side pretensioner ignition current output (High) circuit

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

2) Inspect the rear left side pretensioner ignition current output (High) circuit between the SRS control unit (pin 6 of R7) and the rear left side pretensioner (pin 2 of R61) for an open circuit or high resistance. Is the result normal?

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 rear left side pretensioner ignition current output (Low) circuit.

Repair the circuit as necessary.

=>Go to Repair verification.

8. Inspection for open circuit in rear left side pretensioner ignition current output (Low) circuit

1) Inspect the rear left side pretensioner ignition current output (Low) circuit between the SRS control unit (pin 7 of R7) and the rear left side pretensioner (pin 1 of R61) for an open circuit or high resistance. Is the result normal?

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.

9. SRS control unit harness connector inspection

1) Inspect for poor connections at the SRS control unit harness connector (pins 6 and 7 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.

10. 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.

11. 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.