DTC Troubleshooting: B1026

DTC B1026:  Front Passenger's Door Lock Switch Signal Error

1.Clear the DTCs with the HDS.

2.Turn the ignition switch OFF, and then back ON (II).

3.Operate the front passenger's door lock switch ten times.

4.Check for DTCs with the HDS.

Is DTC B1026 indicated?


YES - Go to 5.


NO - Intermittent failure. The front passenger's door lock system is OK at this time.n


5.With the front passenger's door lock switch in the neutral position, select KEYLESS from the HDS and enter the DATA LIST.

6.Check the ON/OFF information of the FRONT PASSENGER'S DOOR LOCK SWITCH (LOCK) and FRONT PASSENGER'S DOOR LOCK SWITCH(UNLOCK) in the DATA LIST.

Are both information indicators OFF?


YES - Faulty MICU, replace the under-dash fuse/relay box.n


NO - Go to 7.

7.Disconnect the front passenger's power window switch 8P connector.

8.Check the ON/OFF information of the FRONT PASSENGER'S DOOR LOCK SWITCH (LOCK) and FRONT PASSENGER'S DOOR LOCK SWITCH(UNLOCK) in the DATA LIST.

Are both information indicators OFF?


YES - Faulty door lock switch; replace the front passenger's window switch.n


NO - Go to 9.


9.Turn the ignition switch OFF.

10.Disconnect the under-dash fuse/relay box connector T (34P).

11.Check for continuity between the No. 1 (UNLOCK) and No. 6 (LOCK) terminals of the front passenger's window switch 8P connector and body ground.

 

Is there continuity?


YES - Repair a short in the LOCK or UNLOCK wire.n


NO - Go to 12.

12.Check for continuity between the No. 1 (UNLOCK) and No. 6 (LOCK) terminals of the front passenger's window switch 8P connector.

 

Is there continuity?


YES - Repair a short in the wire between the LOCK and UNLOCK wires.n


NO - Faulty MICU, replace the under-dash fuse/relay box.n