Durango 4WD V8-5.9L VIN Z (1998)
Overdrive Indicator Lamp: Testing and Inspection
The diagnosis found here addresses an inoperative overdrive-off indicator lamp condition. If the overdrive-off indicator lamp comes on and stays on with
the engine running, refer to the proper Diagnostic Procedures for diagnosis of the Powertrain Control Module (PCM) and the transmission control
system circuits.
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, REFER TO AIR BAGS AND SEAT BELTS/AIR BAGS BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE.
FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
1. Check the fuse in the junction block. If OK, go to Step 2. If not OK, repair the shorted circuit or component as required and replace the faulty fuse.
2. Turn the ignition switch to the On position. Check for battery voltage at the fuse in the junction block. If OK, go to Step 3. If not OK, repair the
open circuit to the ignition switch as required.
3. Disconnect and isolate the battery negative cable. Unplug the gray PCM wire harness connector. Install a jumper wire between the overdrive lamp
driver circuit cavity of the gray PCM wire harness connector and a good ground. Connect the battery negative cable. Turn the ignition switch to
the On position. The overdrive-off indicator lamp should light. Remove the jumper wire and the lamp should turn off. If OK, refer to the proper
Diagnostic Procedures for diagnosis of the Powertrain Control Module (PCM) and the transmission control system circuits. If not OK, go to Step
4.
4. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Remove the instrument cluster. Check for continuity
between the overdrive lamp driver circuit cavity of the gray PCM wire harness connector and a good ground. There should be no continuity. If
OK, go to Step 5. If not OK, repair the short circuit as required.
5. Check for continuity between the overdrive lamp driver circuit cavities of the gray PCM wire harness connector and the instrument cluster wire
harness connector (connector A). There should be continuity. If OK, replace the faulty bulb. If not OK, repair the open circuit as required.