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

GF88.79-P-2010GM 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 sequence for automatically dimming outside and inside rearview mirror
^ C. 15R On
^ No overvoltage or undervoltage
^ Reverse gear not engaged
^ Interior illumination not switched on

Automatically dimming outside mirror and inside rearview mirror, function sequence
The mirror glass of the inside rearview mirror unit (A67) and left electrically adjustable and heated outside mirror (M21/1) (on left-hand drive vehicle) is electrochromatically 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 unit (master) and the overhead control panel control unit (N70) evaluate these input factors and provide dimming information in the form of an actuation voltage.

Dimming of the inside rearview mirror unit takes place by actuating the mirror dimming (A67h3).

Dimming the left outside mirror is accomplished by actuating the mirror dimming (M21/1h1) using the left front door control unit (N69/1), which receives the request via the interior CAN from the overhead control panel control unit.

If an interior lamp is switched on during mirror dimming or the central gateway control unit (N93) signals "Reverse gear is engaged" via the interior CAN, dimming is canceled.