B1128

DTC B1128: Driver's Door Lock Switch Signal Error

1. Clear the DTCs using the HDS.
2. Cycle the ignition switch to OFF, and then back ON.
3. Operate the driver's door look switch.
4. Check for DTCs using the HDS.

Is DTC B1128 indicated?

YES - Go to step 5.

NO - Intermittent failure. The driver's door lock switch system is OK at this time. Check pinfits and connections.

5. With no driver's door lock switch operation, select SECURITY from the HDS, and enter the DATA LIST.
6. Check the ON/OFF information of the Driver's Door Lock Switch (LOCK) and Driver's Door Lock Switch (UNLOCK) in the DATA LIST.

Are both information indicators OFF?

YES - Go to step 7.

NO - Check the door lock switch. If the driver's door lock switch is OK, faulty door multiplex control unit-replace the power window master switch.

7. Push the driver's door lock switch in LOCK and UNLOCK positions, and check the ON/OFF information of the Driver's Door Lock Switch (LOCK) and Driver's Door Lock Switch (UNLOCK) in the DATA LIST.

Is the Driver's Door Lock Switch (LOCK) (Driver's Door Lock Switch (UNLOCK)) information indicator ON when the door lock switch is pushed in each switch position, and OFF when the door lock switch is released?

YES - Intermittent failure, the door multiplex control unit (power window master switch) is OK at this time. Check pinfits and connections.

NO - Faulty door multiplex control unit; replace the power window master switch.