DTC B1053[57] Vehicle Variant Missing (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. SRS harness inspection

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

2) Disconnect the SRS control unit harness connectors (B9 and R6).

3) Verify that each terminal of the SRS control unit harness connector is as follows. Are the terminals properly connected?

Note

  • When the SRS control unit detects conditions other than the following, the DTC is set.

[Models without far side airbags and knee airbags]

  • The vehicle model identification terminal (pin 5 of B9) is not connected to ground.
  • The vehicle model identification terminal (pin 3 of R6) is connected to ground.

[Models with far side airbags and knee airbags (Regular cab models)]

  • The vehicle model identification terminal (pin 3 of R6) is not connected to ground.

Note

  • On the SRS control unit side, there is no terminal to be connected with the vehicle identification terminal (pin 5 of B9).

[Models with far side airbags and knee airbags (Except regular cab models)]

  • The vehicle model identification terminal (pin 5 of B9) is not connected to ground.
  • The vehicle model identification terminal (pin 3 of R6) is not connected to ground.

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.

No

Repair or replace the SRS harness.

=>Go to Repair verification.

3. 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.

4. 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.