DTC Troubleshooting: B1128

DTC B1128: Driver's Door Lock Switch Signal Error

1. Clear the DTCs using the HDS.

1. Cycle the ignition switch to OFF, and then back ON.

1. Operate the driver's door look switch.

1. Check the DTCs by selecting the DTCs MENU (DTCs) from 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.■

1. With no driver's door lock switch operation, select the TEST MODE MENU from the HDS, and enter the DATA LIST.

1. Check the ON/OFF information of the DRV RM DOR LK and DR RM DOR UNLK 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.■

1. Push the driver's door lock switch in LOCK and UNLOCK positions, and check the ON/OFF information of the DRV RM DOR LK and DR RM DOR UNLK in the DATA LIST.

Is the DRV RM DOR LK (DR RM DOR UNLK) 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.■
NO | - | Faulty door multiplex control unit; replace the power window master switch.■