DTC B1127: Driver's Door Key Cylinder Switch Input Circuit Malfunction (Simultaneous input of lock and unlock signal)
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 ).
- You will need two keys to do this troubleshooting.
- Clear the DTCs with the HDS.
- Turn the ignition switch to LOCK (0) and then back to ON (II).
- Insert the ignition key into the driver's door key cylinder, and turn the key to the LOCK and UNLOCK positions at least 10 times.
- Check for DTCs with the HDS.
Is DTC B1127 indicated?
YES -Go to step 5.
NO -Intermittent failure, the driver's door key cylinder switch system is OK at this time. Check for loose or poor connections.
- With the driver's door key cylinder in the neutral position, select KEYLESS TRANSMITTER with the HDS, and enter the DATA LIST.
- Check the ON/OFF information of the DRIVER'S DOOR KEY CYLINDER SWITCH (LOCK) and DRIVER'S DOOR KEY CYLINDER SWITCH (UNLOCK) in the DATA LIST.
Are both information indicators OFF?
YES -The MICU is faulty. Replace the under-dash fuse/relay box.
- USA models (see REMOVAL AND INSTALLATION )
- Canada models (see CANADA MODELS )
NO -Go to step 7.
- Disconnect the driver's door lock actuator/knob switch 10P connector.
- Check the ON/OFF information of the DRIVER'S DOOR KEY CYLINDER SWITCH (LOCK) and DRIVER'S DOOR KEY CYLINDER SWITCH (UNLOCK) in the DATA LIST.
Are both information indicators OFF?
YES -Faulty driver's door key cylinder switch; replace the driver's door latch (see DOOR LATCH REPLACEMENT ).
NO -Go to step 9.
- Turn the ignition switch to LOCK (0).
- Disconnect under-dash fuse/relay box connector F (12P).
- Check for continuity between body ground and under-dash fuse/relay box connector F (12P) terminals No. 3 (UNLOCK) and No. 4 (LOCK) individually.Fig 1: Checking Continuity Between Body Ground And Under-Dash Fuse/Relay Box Connector F (12P) Terminals No. 3 (Unlock) And No. 4 (Lock)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Repair a short to ground in the LOCK or UNLOCK wire.
NO -Go to step 12.
- Check for continuity between under-dash fuse/relay box connector F (12P) terminals No. 3 (UNLOCK) and No. 4 (LOCK).Fig 2: Checking Continuity Between Under-Dash Fuse/Relay Box Connector F (12P) Terminals No. 3 (Unlock) And No. 4 (Lock)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Repair a short in the wire between the LOCK and UNLOCK wires.
NO -Faulty MICU; replace the under-dash fuse/relay box.
- USA models (see REMOVAL AND INSTALLATION )
- Canada models (see CANADA MODELS )