Dodge Durango

 Service Manual

Electrically Heated Systems » Diagnosis and testing
Defogger switch

For circuit descriptions and diagrams, refer to 8W-48 - Rear Window Defogger in Group 8W - Wiring Diagrams.

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, REFER TO GROUP 8M - PASSIVE RESTRAINT SYSTEMS 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) Disconnect and isolate the battery negative cable. Remove the lower bezel from the instrument panel and unplug the rear window switch pod wire harness connector.

(2) Check for continuity between the ground circuit cavity of the rear window switch pod wire harness connector and a good ground. There should be continuity. If OK, go to Step 3. If not OK, repair the open circuit as required.

(3) Connect the battery negative cable. Check for battery voltage at the fused B(+) circuit cavity of the rear window switch pod wire harness connector. If OK, go to Step 4. If not OK, repair the circuit to the Power Distribution Center (PDC) fuse as required.

(4) Turn the ignition switch to the On position.

Check for battery voltage at the fused ignition switch output (run) circuit cavity of the rear window switch pod wire harness connector. If OK, go to Step 5. If not OK, repair the circuit to the junction block fuse as required.

(5) Turn the ignition switch to the Off position.

Disconnect and isolate the battery negative cable.

Plug the wire harness connector into the rear window switch pod. Connect the battery negative cable.

Turn the ignition switch to the On position. Back probe the rear window defogger relay output circuit cavity of the rear window switch pod wire harness connector. Depress and release the rear window defogger switch. There should be battery voltage.

Depress and release the rear window defogger switch again. There should be zero volts. If OK, go to Step 6.

If not OK, replace the faulty rear window switch pod.

(6) Depress and release the rear window defogger switch. The rear window defogger indicator lamp should light. If the indicator lamp does not light, replace the bulb with a known good unit and test again. If the lamp is still inoperative, replace the faulty rear window switch pod.

Defogger system

Rear glass heating grid

Defogger switch