Power Mirror System

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. If the problem being diagnosed is inoperative power mirror switch directional button illumination for the Driver Door Module (DDM)-type switch, proceed as follows. If not, go to Step 4. Check the power window circuit breaker in the junction block. If OK, go to Step 3. If not OK, replace the faulty circuit breaker.
3. Check for battery voltage at the fused ignition switch output circuit cavity of the 12-way DDM wire harness connector with the ignition switch in the On position. If OK, replace the faulty DDM. If not OK, repair the open circuit to the power window circuit breaker in the junction block as required.
4. If the problem being diagnosed is an inoperative power mirror electric heating grid, proceed as follows. If not, go to Step 7. Disconnect and isolate the battery negative cable. Unplug the wire harness connector at the inoperative mirror as described. Check for continuity between the ground circuit cavity in the body half of the power mirror wire harness connector and a good ground. If OK, go to Step 5. If not OK, repair the open circuit to ground as required.
5. Connect the battery negative cable. Turn the ignition switch to the On position. Turn on the rear window defogger system. Check for battery voltage at the rear window defogger relay output circuit cavity in the body half of the power mirror wire harness connector. If OK, go to Step 6. If not OK, repair the open circuit to the rear window defogger relay as required.
6. Check for continuity between the ground circuit and the rear window defogger relay output circuit cavities in the mirror half of the power mirror wire harness connector. There should be continuity. If not OK, replace the faulty power mirror. If OK, check the resistance through the electric heating grid circuit. Correct resistance through the electric heating grid should be from 10 to 16 Ohms when measured at an ambient temperature of 21 °C (70 °F). If not OK, replace the faulty power mirror.
7. Disconnect and isolate the battery negative cable. Remove the stand-alone power mirror switch or the DDM as described. Unplug the wire harness connector from the stand-alone switch or the 8-way wire harness connector from the DDM. Connect the battery negative cable. Turn the ignition switch to the On position. Check for battery voltage at the fused ignition switch output circuit cavity of the stand-alone switch wire harness connector or the 8-way DDM wire harness connector. If OK, go to Step 8. If not OK, repair the open circuit to the junction block as required.
8. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Check for continuity between the ground circuit cavity of the stand-alone switch wire harness connector or the 8-way DDM wire harness connector and a good ground. There should be continuity. If OK, go to Step 9. If not OK, repair the circuit to ground as required.

Stand-Alone Power Mirror Switch Continuity:

Driver Door Module Power Mirroe Switch Continuity:

9. Check the stand-alone power mirror switch or DDM-mounted power mirror switch continuity as shown in. If OK, go to Step 10. If not OK, replace the faulty stand-alone power mirror switch or the faulty DDM.

Power Mirror Test:

10. Connect the battery negative cable. Use two jumper wires, one connected to a 12 Volt battery feed, and the other connected to a good body ground. See the Body and Frame/Mirrors/Power Mirror Test chart for the correct jumper wire connections at the mirror half of the power mirror wire harness connector. If the mirror reactions are OK, repair the wire harness between the mirror and the stand-alone power mirror switch or the DDM as required. If the mirror reactions are not OK, replace the faulty power outside mirror assembly.