Drivers Door Key Cylinder Switch Circuit Troubleshooting

Keyless/Power Door Locks/Security System Symptom Troubleshooting - Driver's door key cylinder switch circuit troubleshooting

Driver's door key cylinder switch circuit troubleshooting

NOTE: Before troubleshooting, check the B-CAN DTCs.
If any DTC is indicated, refer to B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A, and troubleshoot the indicated DTCs first.

1. Turn the ignition switch to ON (II).

2. Disconnect the driver's door latch 10P connector.

3. Connect driver's door latch 10P connector terminal No. 9 to body ground with a jumper wire.





4. Select SECURITY with the HDS, and enter the DATA LIST.

5. Check the ON/OFF information of the DRIVER'S DOOR KEY CYLINDER SWITCH (LOCK) in the DATA LIST.

Is information indicator ON?

YES -

Go to step 6.

NO -

Go to step 8.

6. Test the driver's door key cylinder switch Door Key Cylinder Switch Test.

Is the switch OK?

YES -

Go to step 7.

NO -

Faulty driver's door key cylinder switch; replace the driver's door latch Service and Repair.

7. Check for continuity between driver's door latch 10P connector terminal No. 5 and body ground.





Is there continuity?

YES -

Replace the driver's MPCS unit Power Windows (Drivers MPCS Unit) Input Test/Replacement.

NO -

Repair an open or high resistance in the wire or poor ground (G601).

8. Connect driver's MPCS unit connector A (40P) terminal No. 22 to body ground with a jumper wire.





9. Check the ON/OFF information of the DRIVER'S DOOR KEY CYLINDER SWITCH (LOCK) in the DATA LIST.

Is information indicator ON?

YES -

Repair an open or high resistance in the wire.

NO -

Replace the driver's MPCS unit Power Windows (Drivers MPCS Unit) Input Test/Replacement.