Automatic Dimming Interior Rearview Mirror

Function requirements
- No overvoltage or undervoltage
- Term. 15 or term. 15 0N

Function
The glass of the interior rearview mirror unit (A67) can be electrochromatically dimmed. The mirror glass between the reflector and the glass cover contains a layer of electrolyte gel. The light transmission ratio of this gel changes when a voltage is applied to it.

The interior rearview mirror sets the amount of light from behind in relation to the ambient light, calculates the required amount of dimming, dims the surface the mirror and supplies data about the dimming of the mirror to the overhead control panel.

The two input parameters are recorded by the automatic forward mirror dimming sensor (A67h1) in the mirror housing (at the rear) and by the automatic rear mirror dimming sensor (A67h2) in the mirror glass of the interior rearview mirror unit (A67).

If an interior light is switched on or reverse gear (CAN message) is engaged. the interior rearview mirror is always adjusted quickly to the state of maximum brightness. This is achieved by means of an additional signal lead from the overhead control panel control module (N70) to the interior rearview mirror unit (A67).


NOTE: The interior rearview mirror unit (A67) also acts as the master for the exterior mirror dimming function (driver's side).