The VTM-4 Lock Indicator Comes on When the Ignition Switch Is Turned ON (II) and Does Not Go Off

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

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

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

3. Watch 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 short to ground in the wire between VTM-4 control unit (A16) and the VTM-4 LOCK switch.

NO - Replace the VTM-4 LOCK switch. Testing and Inspection