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4. Disconnect and isolate the battery negative cable. Check for continuity between the ground circuit cavity in the door wire harness half of the power mirror switch wire harness connector and a good ground. There should be MIRROR-INSIDE REARVIEW DESCRIPTION The automatic day/night mirror uses a thin layer of electrochromic material between two pieces of conductive glass OPERATION The ambient photocell sensor is located on the forward-facing (windshield side) of the rear view mirror housing, and The automatic day/night mirror circuitry also monitors the transmission using an input from the backup lamp circuit. The automatic day/night mirror is a completely self-contained unit and cannot be repaired. If faulty or damaged, the DIAGNOSIS AND TESTING AUTOMATIC DAY/NIGHT MIRROR For complete circuit diagrams, refer to the appropriate wiring information. 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. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Unplug the wire harness connector from the automatic day/night mirror. Connect the battery negative cable. Turn the ignition 8N - 212 POWER MIRRORS-SERVICE INFORMATION WK |