Pinpoint Test 1: The Auto-Dimming Mirror Does Not Operate Correctly

PINPOINT TEST 1: THE AUTO-DIMMING MIRROR DOES NOT OPERATE CORRECTLY

See the Tribute Wiring Diagram for schematic information.

Normal Operation

The interior auto-dimming mirror receives voltage from Smart Junction Box (SJB) fuse 41 (15A) through circuit (GY) and ground from circuit (B/GY). When the vehicle is placed in REVERSE, voltage is supplied to the interior mirror through circuit (G/L) in order to the turn the dimming feature off. There are 2 photoelectric sensors: one in the front of the mirror and one mounted on the glass side of the mirror. If the sensors are blocked, the auto-dimming feature may not work correctly. Always verify both sensors are not physically blocked before attempting to diagnose interior auto-dimming mirror concerns.

Possible Causes
- Fuse
- Wiring, terminals or connectors
- Interior auto-dimming rear view mirror

Diagnostic Procedure

CAUTION:Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE:If the Transmission Range (TR) sensor is malfunctioning and the backup lamps are on all the time or do not turn on, the interior auto-dimming mirror will not darken or return to normal view.

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