B1127

DTC Troubleshooting: B1127

DTC B1127:

Driver's Door Key Cylinder Switch Malfunction

NOTE:

- 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.

- You will need two keys to do this troubleshooting.

1. Clear the DTCs with the HDS.

2. With the one ignition key, turn the ignition switch to LOCK (0), and then back to ON (II).

3. Insert the ignition key into the driver's door key cylinder switch, and turn the key to the LOCK and UNLOCK positions 10 times.

4. 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.

5. With the driver's door key cylinder in the neutral position, select KEYLESS TRANSMITTER with the HDS, and enter the DATA LIST.

6. 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 -

Go to step 12.

NO -

Go to step 7.

7. Disconnect the driver's door lock actuator 10P connector.

8. 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 Service and Repair.

NO -

Go to step 9.

9. Turn the ignition switch to LOCK (0).

10. Disconnect the power window master switch 37P connector.

11. Check for continuity between body ground and power window master switch 37P connector terminals No. 28 and No. 29 individually.





Is there continuity?

YES -

Repair a short to ground in the LOCK or UNLOCK wire(s).

NO -

Replace the power window master switch Power Window Master Switch Replacement.

12. Turn the ignition switch to LOCK (0).

13. Disconnect the driver's door lock actuator 10P connector.

14. Disconnect the power window master switch 37P connector.

15. Check for continuity between power window master switch 37P connector terminals No. 28 and No. 29.





Is there continuity?

YES -

Repair a short between the LOCK and UNLOCK wires.

NO -

Substitute a known-good power window master switch. If the symptom goes away, replace the original power window master switch Power Window Master Switch Replacement. If not, the driver's door key cylinder switch is faulty; replace the driver's door latch Service and Repair.