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

GF88.79-P-2010FL Automatic Dimming Outside Mirror And Inside Rearview Mirror, Function
- with CODE (249) Automatically dimming inside rearview mirror and outside mirror (driver)
- except CODE (494) USA version


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

The electronic ignition lock control unit (N73) transmits circuit 15 status to the front SAM control unit with fuse and relay module (N10/1) via the interior CAN (CAN B).

Automatically dimming outside mirror and inside rearview mirror, function sequence
The mirror glass on the inside rearview mirror (A67) and left outside mirror (M21/1) dims electrochromatically. 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 senses the ambient light via the mirror dimming light sensor, forward (A67h1) and the light hitting the mirror glass via the mirror dimming light sensor, rearward (A67h2). The inside mirror evaluates the input factors and transmits the mirror dimming request via the wiper/inside review mirror LIN (LIN 2) over the overhead control panel control unit (N70) (with code (414) Power glass tilting/sliding sunroof) or the overhead control panel electronic circuitry (N70/3) (without code (414) Power glass tilting/sliding sunroof) to the front SAM control unit.
The front SAM control unit transmits the dimming information to the left front door control unit (N69/1) via the interior CAN.

The left door control unit receives the dimming information and supplies the corresponding actuation voltage to the mirror dimming (M21/1h1) of the left outside mirror.
The mirror glass in the inside rearview mirror is dimmed by the inside rearview mirror itself actuating the mirror dimming (A67h3).

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