GF88.79-P-2010LE Automatic Dimming Outside Mirror and Inside Rearview Mirror, Function

GF88.79-P-2010LE Automatic Dimming Outside Mirror And Inside Rearview Mirror, Function
- with CODE (249) Automatically dimming inside rearview mirror and outside mirror (driver)
- as of model year 09



Function requirements
^ Reverse gear not engaged
^ Interior illumination not switched on

The reverse gear status is transmitted by the central gateway control unit (N93) to the interior CAN.

Automatically dimming outside mirror and inside rearview mirror, function sequence
The mirror glass of the inside rearview mirror (A67) and left electrically adjustable and heated outside mirror (M21/1) is electro-chromatically dimmable. This is realized by a layer of electrolyte gel in the mirror which controls the light permeability in increments depending on the voltage applied.

The inside rearview mirror unit senses the ambient light via the mirror dimming sensor, forward (A67h1) and the light hitting the mirror glass via the mirror dimming sensor, rearward (A67h2).

The inside rearview mirror evaluates these input variables and supplies dimming information to the overhead control panel control unit (N70), which transmits the message for mirror dimming to the passenger compartment CAN-B bus.

The left front door control unit (N69/1) (model 221) or left door control unit (N69/1) (model 216) relays the dimming information and transmits the corresponding actuation voltage to the mirror dimming circuit (M21/1h1) in the left electrically adjustable and heated outside mirror.

The inside mirror dimming information is sent to the overhead control panel control unit, which supplies the voltage to the inside rearview mirror dimming circuit.

If an interior lamp is switched on during mirror dimming or the reverse gear is engaged, the dimming is interrupted.