VTM-4 Lock Indicator Light Circuit Troubleshooting
VTM-4 LOCK Indicator Light Circuit TroubleshootingThe VTM-4 LOCK indicator light does not come on when the VTM-4 lock switch is pushed.
NOTE: The VTM-4 LOCK indicator will only come on when the engine is running and the transmission is in R, 1, or 2 before the switch is pressed.
1. Check the No. 9 (10A) fuse in the driver's under dash fuse/relay box.
Is the fuse OK?
YES - Go to step 2.
NO - Replace the fuse and recheck.
2. Turn the ignition switch ON (II), and watch the VTM-4 LOCK indicator light.
Does the VTM-4 LOCK indicator light come on with the ignition switch ON (II), and does the light go off 4 seconds later?
YES - Go to step 3.
NO - Go to step 10.
3. Start the engine, and move the shift lever to the R, 1, and 2 positions, then watch the VTM-4 LOCK indicator light.
Does the VTM-4 LOCK indicator light come on when the VTM-4 lock switch is pushed?
YES - The system is OK at this time.
NO - Go to step 4.
4. Check for A/T system DTC.
Is there DTC?
YES - Troubleshoot the A/T system for the cause of the DTC.
NO - Go to step 5.
5. Turn the ignition switch OFF.
6. Disconnect the A (22P) and B (26P) connectors from the VTM-4 control unit.
7. Turn the ignition switch ON (II).
8. Connect a voltmeter between the B11 terminal of the VTM-4 control unit and body ground.
Is there battery voltage when the VTM-4 lock switch is pushed?
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 9.
9. Test the VTM-4 lock switch.
Is the VTM-4 lock switch OK?
YES - Repair open in the wire between the VTM-4 lock switch and the VTM-4 control unit.
NO - Replace the VTM-4 lock switch.
10. Connect the B9 terminal of the VTM-4 control unit to body ground with a jumper wire, and watch the VTM-4 LOCK indicator light.
Does the VTM-4 LOCK indicator light 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 11.
11. Turn the ignition switch OFF.
12. Remove the VTM-4 lock switch.
13. Connect the No. 1 terminal of the VTM-4 lock switch 6P connector to body ground with a jumper wire. Check the continuity between the B9 terminal and body ground.
Is there continuity?
YES - Go to step 14.
NO - Repair open in the wire between the B9 terminal and the VTM-4 lock switch.
14. Turn the ignition switch ON (II).
15. Measure the voltage between the No. 2 terminal of the VTM-4 lock switch 6P connector and body ground.
Is there battery voltage?
YES - Replace the VTM-4 LOCK indicator light bulb.
NO - Repair open in the wire between the No. 2 terminal of the VTM-4 lock switch 6P connector and the driver's underdash fuse/relay box.
The VTM-4 LOCK indicator light comes on with ignition switch ON (II), and does not go off.
1. Disconnect the B (26P) connector from the VTM-4 control unit.
2. Turn the ignition switch ON (II), and watch the VTM-4 LOCK indicator light.
Does the VTM-4 LOCK indicator light come on with ignition switch ON
YES - Go to step 3.
NO - Check for loose terminal fit in the VTM-4 control unit connectors. If it is normal, replace the VTM-4 control unit.
3. Turn the ignition switch OFF.
4. Disconnect the VTM-4 lock switch connector.
5. Check for continuity between the B9 terminal of the VTM-4 control unit and body ground.
Is there continuity?
YES - Repair short to ground in the wire between the B9 terminal of the VTM-4 control unit and the VTM-4 lock switch.
NO - Replace the VTM-4 lock switch.
The VTM-4 LOCK indicator light does not come on for about 4 seconds when ignition switch ON (II).
1. Disconnect the B (26P) connector from the VTM-4 control unit.
2. Turn the ignition switch ON (II).
3. Connect the B9 terminal of the VTM-4 control unit to body ground with a jumper wire, and watch the VTM-4 LOCK indicator light.
Does the VTM-4 LOCK indicator light 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 4.
4. Turn the ignition switch OFF.
5. Remove the VTM-4 lock switch.
6. Connect the No. 1 terminal of the VTM-4 lock switch 6P connector to the body ground with a jumper wire. Check for continuity between the B9 terminal and body ground.
Is there continuity?
YES - Go to step 7.
NO - Repair open in the wire between the B9 terminal of the VTM-4 control unit and VTM-4 lock switch.
7. Turn the ignition switch ON (II).
8. Measure the voltage between the No. 2 terminal of the VTM-4 lock switch 6P connector and body ground.
Is there battery voltage?
YES - Replace VTM-4 LOCK indicator light bulb.
NO - Repair open in the wire between the No. 2 terminal of the VTM-4 lock switch 6P connector and the driver's underdash fuse/relay box.