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

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Clear the DTCs with the HDS.
Turn the ignition switch OFF, and then back ON (II).
Operate the front passenger's door lock switch several times.
Check for DTCs with the HDS.
Is DTC B1026 indicated?

YES -Go to step 5.

NO -Intermittent failure. The front passenger's door lock system is OK at this time.
With the front passenger's door lock switch in the neutral position, select KEYLESS from the HDS and enter the DATA LIST.
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 -Go to step 12.

NO -Go to step 7.
Disconnect the front passenger's power window switch 8P connector.
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 power window switch.

NO -Go to step 9.
Turn the ignition switch OFF.
Disconnect the under-dash fuse/relay box connector T (34P).
Check for continuity between the No. 1 (LOCK) and No. 6 (UNLOCK) terminals of the front passenger's power window switch 8P connector and body ground.

Fig 1: Checking Continuity Between 1 (LOCK) And 6 (UNLOCK) Terminals Of Front Passenger's Power Window Switch 8P Connector And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

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

NO -Faulty MICU, replace the under-dash fuse/relay box.
Turn the ignition switch OFF.
Disconnect the front passenger's window switch 8P connector.
Disconnect under-dash fuse/relay box connector T (34P).
Check for continuity between the No. 1 (LOCK) and No. 6 (UNLOCK) terminals of the front passenger's power window switch 8P connector.

Fig 2: Checking Continuity Between 1 (LOCK) And 6 (UNLOCK) Terminals Of Front Passenger's Power Window Switch 8P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

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

NO -Substitute a known-good passenger's window master switch, and recheck. If the symptom/indication goes away, replace the original passenger's window switch. If not, the MICU is faulty, replace the under-dash fuse/relay box.