DTC Troubleshooting: B1026DTC B1026: Front Passenger's Door Lock Switch Lock/Unlock Signal Error
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.
Troubleshooting - B-CAN System Diagnosis Test Mode A 1.
Clear the DTCs with the HDS.
2.
Turn the ignition switch to LOCK (0), and then back to ON (II).
3.
Operate the front passenger's door lock switch several times.
4.
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.
5.
With the front passenger's door lock switch in the neutral position, select KEYLESS from the HDS and enter 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 - Go to step 12.
NO - Go to step 7.
7.
Disconnect the front passenger's power window switch 14P 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 power window switch.
NO - Go to step 9.
9.
Turn the ignition switch to LOCK (0).
10.
Disconnect under-dash fuse/relay box connector T (34P).
11.
Check for continuity between front passenger's power window switch 14P connector terminals No. 12 and No. 10 and body ground.
Is there continuity?
YES - Repair a short to ground in the wire.
NO - Faulty MICU; replace the under-dash fuse/relay box.
12.
Turn the ignition switch to LOCK (0).
13.
Disconnect the front passenger's window switch 14P connector.
14.
Disconnect under-dash fuse/relay box connector T (34P).
15.
Check for continuity between front passenger's power window switch 14P connector terminals No. 12 and No. 10.
Is there continuity?
YES - Repair a short to ground in the wire.
NO - Substitute a known-good passenger's window 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.
