Automatic dimming feature for exterior rearview mirror on driver's side, function - GF88.79-P-2003S

MODEL 220.063 /065 with CODE (249b) Automatic dimming interior and exterior (driver-side) rearview mirrors 

MODEL 215, 220 / (except, 220.063 /065) 

Driver-side exterior rearview mirror automatic dimming feature 

Function prerequisites 

• Voltage not too low or too high
• 15R or c.15 ON

Function 

The mirror glass in the exterior rearview mirror on the driver's side can be dimmed electro-chromatically. For this purpose a layer of electrolytic gel is located in the mirror glass between the reflector and cover glass. When a voltage is supplied to this gel it changes its permeability to light.

The light reaching the surface of the mirror is reflected to a greater or lesser extent depending on the magnitude of the control voltage. The control voltage is regulated by the interior rearview mirror unit (A67)  (master) and the overhead control panel control module (N70)  . Two discrete leads are connected to the left front door control module (N69/1)  for this purpose (vehicles with right-hand steering: right front door control module ((N69/2)).

Regulation is accomplished depending on the ambient light and the light reaching the mirror. These two variables are measured by the ambient light sensor (A67h2)  in the interior rearview mirror housing (rear) and the automatic dimming interior rearview mirror sensor (A67h1)  in the mirror glass in the interior rearview mirror unit.

If one of the interior lights is switched on or the CAN message "Reverse gear engaged" is received from the electronic ignition/starter switch control module (N73)  , the exterior rearview mirror as well as interior rearview mirror become brighter.

	Interior rearview mirror unit, location/purpose/design/function		GF68.49-P-2100S
	Overhead control panel control module, location/purpose/design/function		GF82.20-P-4101S