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

GF88.79-P-2010FQ Automatic Dimming Outside Mirror and Inside Rearview Mirror, Function
MODEL 218
- with CODE (249) Automatically dimming inside rearview mirror and outside mirror (driver)
- with CODE (494) USA version
MODEL 218
- with CODE (249) Automatically dimming inside rearview mirror and outside mirror including fold-in outside mirrors
- except CODE (494) USA version

Function sequence for automatically dimming outside and inside rearview mirror
^ Circuit 15R ON
^ No overvoltage or undervoltage
^ Reverse gear not engaged
^ Interior illumination not switched on

The electronic ignition switch 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 electro-chromatically. 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 rearview mirror evaluates the input factors and transmits the mirror dimming request to the front SAM control unit vi a the wiper/ inside rearview mirror LIN (LIN 2).
The front SAM control unit sends the dimming information over the interior CAN to the left front door control unit (N69/1).
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 interior mirrors is dimmed by the interior mirror itself through activation by the mirror dimming (A67h3).
If an interior illumination is switched on during mirror dimming or the reverse gear is engaged, the dimming is interrupted.