1. DTC B1053[57] DTC description
The SRS control unit determines the vehicle model by reading the conditions of vehicle model identification terminals when the ignition switch is turned ON. Normal conditions for the terminals (pin 5 of B9, pin 3 of R6) vary depending on specifications. When the SRS control unit detects that the terminals are in the conditions other than the following combinations, the SRS control unit or SRS harness is determined to be incompatible with this model, and 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.
Note
- DTC may not be set when there are malfunctions with both the SRS control unit and the SRS harness.
2. Condition for setting DTC B1053[57]
- The SRS control unit detects that the combination of the SRS control unit and SRS harness is improper.
3. Action taken when DTC B1053[57] sets
- SRS airbag warning light illuminates.
Warning
- During the maintenance work, do not hit or shake the SRS control unit when handling it.
- If the SRS control unit is not properly installed, the SRS control unit may cause malfunctions. This may result in deployment of the SRS airbag and personal injury.
Caution
- To prevent the replacement SRS parts from malfunctioning and generating a battery short circuit, make sure to remove the battery cable before replacing the parts.