Starting in 2000 an accessory Auto Dimming Mirror was available. The mirror could come equipped with an electronic compass or an ambient temperature sensor or Homelink (Homelink allows you to program your garage remote to one of three buttons on the mirror assembly). This bulletin describes the mirror operation and diagnosis. NOTE: Mazda6 may come with factory or accessory installed auto-dimming mirror. If the unit is factory installed, look in the wiring diagram for wiring information, if the unit is port or dealer installed, then the wiring information in this bulletin applies.
PINPOINT TEST “A” MIRROR FACE DOES NOT DIM
The forward facing sensor detects ambient light. This is to determine day or night time. This sensor will dim the mirror during night driving. NOTE: The forward sensor dims in proportion to how dark it is. If the forward sensor is covered entirely, the mirror defaults to its darkest setting. The rear facing sensor detects light coming from vehicle headlights from behind. The rear facing sensor is used to darken the mirror further when headlights are detected.

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