The VTM-4 Lock Indicator Comes On When The Ignition Switch Is Turned On (II) And Does Not Go Off

Rear Differential Symptom Troubleshooting - The VTM-4 LOCK indicator comes on when the ignition switch is turned ON (II) and does not go off

The VTM-4 LOCK indicator comes on when the ignition switch is turned ON (II) and does not go off

NOTE: Before you troubleshoot, review the general troubleshooting information Initial Inspection and Diagnostic Overview.

1. Disconnect VTM-4 control unit connector A (22P).

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

3. Check the VTM-4 LOCK indicator.

Does the VTM-4 LOCK indicator come on?

YES -

Go to step 4.

NO -

Check for poor connections or loose terminals at the VTM-4 control unit connectors. If the connections are OK, substitute a known-good VTM-4 control unit Service and Repair and recheck. If the symptom/indication goes away with the known-good VTM-4 control unit, replace the original VTM-4 control unit Service and Repair.�

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

5. Disconnect the VTM-4 LOCK switch 5P connector.

6. Check for continuity between VTM-4 control unit connector terminal A16 and body ground.





Is there continuity?

YES -

Repair a short to body ground in the wire between VTM-4 control unit (A16) and the VTM-4 LOCK switch.�

NO -

Replace the VTM-4 LOCK switch Service and Repair.�