Door Switch: Testing and Inspection

For circuit descriptions and diagrams, refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, REFER TO RESTRAINTS Air Bag(s) Arming and Disarming 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. Rotate the headlamp switch knob counterclockwise to ensure that the dome lamps are not switched OFF. Open the driver door and note whether the interior lamps light. They should light.
If OK, (Refer to HEADLAMP SWITCH - DIAGNOSIS AND TESTING Headlamp Switch).
If not OK, go to Step 2.

2. Disconnect and isolate the battery negative cable. Unplug the driver door ajar switch from its wire harness connector. Check for continuity between the ground circuit cavity of the driver door ajar switch wire harness connector and a good ground. There should be continuity.
If OK, go to Step 3.
If not OK, repair the circuit to ground as required.

3. Check for continuity between the door ajar switch ground circuit terminal and each of the other two terminals of the driver door ajar switch. There should be continuity with the switch plunger released, and no continuity with the switch plunger depressed.
If OK, go to Step 4.
If not OK, replace the faulty switch.

4. Remove the Central Timer Module (CTM) from its mounting bracket to access the CTM wire harness connectors (Refer to BODY CONTROL/CENTRAL TIMER MODULE - REMOVAL Body Control Module). Unplug the 14-way CTM wire harness connector. Check for continuity between the driver door switch sense circuit cavity of the 14-way CTM 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 driver door switch sense circuit cavities of the 14-way CTM wire harness connector and the driver door ajar switch wire harness connector. There should be continuity.
If OK, (Refer to HEADLAMP SWITCH - DIAGNOSIS AND TESTING Headlamp Switch)
If not OK, repair the open circuit as required.