Vtm-4 Indicator Does Not Come on

The VTM-4 indicator does not come on
1. Turn the ignition switch ON (II), and check for operation all gauge assembly indicators.
Do the indicators come on?
YES-Go to step 2.
NO-Check for open or short in the power and ground circuits in the gauge assembly.
2. Disconnect the A (22P) and B (26P) connectors from the VTM-4 control unit.
3. Turn the ignition switch ON (II).





4. Connect the A14 or B20 terminals of the VTM-4 control unit to body ground with a jumper wire, and watch the VTM-4 indicator.
Does the VTM-4 indicator come on?
YES-Check for loose terminal fit in the VTM-4 control unit connectors. If it is normal, replace the VTM-4 control unit.
NO-Go to step 5.
5. Turn the ignition switch OFF.
6. Disconnect the A (30P) connector from the gauge assembly.








7. Connect the A6 terminal of the gauge assembly to body ground with a jumper wire, then check for continuity between the A14 and B20 terminals of the VTM-4 control unit and body ground.
Is there continuity?
YES-Check for a blown bulb in the VTM-4 indicator or a problem in gauge assembly.
NO-Repair open in the wire between the A6 terminal of the gauge assembly and driver's underdash fuse/relay box.