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Home >> Lincoln >> 2004 >> LS V8-3.9L VIN A >> Repair and Diagnosis >> Body and Frame >> Mirrors >> Testing and Inspection >> Pinpoint Tests >> Test C
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Test C

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


Test C1-C4:






Test C4-C5:






Test C6-C7:






Test C8-C10:






Test C10-C12:






Test C13-C14:






Normal Operation
The auto-dimming mirror receives power from circuit 75-AD15 (YE/BU) and ground from circuit 31-AD15 (BK/OG). When the transmission is in REVERSE, the digital transmission range (TR) sensor signals the powertrain control module (PCM) the transmission range. The PCM sends a signal to the rear electronic module (REM) over the standard corporate protocol (SCP) communication link, at which time the REM sends a voltage through circuit 8-AD15 (WH/BU) to the auto-dimming interior mirror, which turns the dimming feature off. Then the auto-dimming interior mirror sends a voltage through circuit 7AD-15 (YE/BU) to the LH exterior mirror, which turns the dimming feature off.

Possible Causes
- circuit 75-AD15 (YE/BU) open
- circuit 31-AD15 (BK/OG) open
- circuit 8-AD15 (WH/BU) open, shorted to ground or power
- auto-dimming interior mirror
- LH auto-dimming exterior mirror
- REM
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