Rearview mirror
Location
The interior rearview mirror unit (A67) is located on the overhead control panel control module (N70) centered at front of the headliner.
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Design
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Tasks:
- The inside rearview mirror (A67) can be adjusted manually.
- Depending on the equipment (see below), the manually adjusted mirror position can be stored, called up later with the memory function and actuated automatically.
- The mirror lens of the inside rearview mirror (A67) can be electro-chromatically dimmed. Dimming is accomplished according to the variables measured by the mirror dimming forward sensor (A67h1) and mirror dimming backward sensor (A67h2).
- The left reading lamp (A67e1) and right reading lamp (A67e2) as well as the ambient light (A67e3) are also integrated in the mirror housing.
Ambient lamp
The ambient lamp (A67e3) is a bright LED located in the interior rear view mirror (A67). It serves for illumination of the center console.
The ambient lamp is switched on automatically when C.15r switched on and switched off automatically when C.15r is switched off.
The ambient lamp (A67e3) is controlled directly by the overhead control panel control module (N70). The overhead control panel control module (N70) receives the information "Status c.15r" for this purpose via the CAN bus from the electronic ignition/starter switch control module (N73).
The ambient lamp is independent of the automatic light switch daylight sensor (B32/1) and the position of the door contact ON and OFF switch (N70s3).
Reading lamps
The left reading lamp (A67e1) and right reading lamp (A67e2) are integrated in the mirror housing.
Automatic dimming function
Function prerequisites:
- No voltage or voltage too low
- C. 15R or C. 15 ON
The interior rearview mirror unit (A67) can be dimmed electro-chromatically. For this purpose, a layer of electrolyte gel is located in the mirror glass between the reflector and the cover lens. Voltage connected to the gel modifies its permeability to light. The light reaching the surface of the mirror is reflected to a greater or lesser extent due to the magnitude of the actuating voltage. The actuating voltage is controlled by the electronic circuitry in the interior rearview mirror. This procedure is subject to the ambient light and the light reaching the mirror.
These two input variables are sensed by the ambient light sensor (A67h2) in the mirror housing (rear side) and the automatic dimming interior rearview mirror sensor (A67h1) in the mirror glass of the interior rearview mirror unit (A67).
If an interior light is switched on or the reverse gear (CAN message) is engaged, the interior rearview mirror is always switched to a brighter setting. This is accomplished by an additional signal lead from the overhead control panel control module (N70) to the interior rearview mirror unit (A67).
The interior rearview mirror unit (A67) serves also as master for the automatic dimming exterior rearview mirror (driver's side).
Driver-side exterior rearview mirror automatic dimming feature
The inside rearview mirror (A67) in combination with the overhead control panel control module (N70) serves as master for dimming the electrically adjustable and heated left outside mirror (M21/1) (special equipment).
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Function prerequisites:
- Voltage not too low or too high
- C. 15R or c.15 ON
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.
Memory feature
The inside rearview mirror (A67) can be adjusted automatically with the memory function (depending on equipment), i.e. stored mirror position can be called up. For this purpose, two DC motors, a vertical adjustment motor (A67m1) and a horizontal adjustment motor (A67m2) are present in the housing actuated by the overhead control panel control module (N70). The vertical position potentiometer (A67r1) and horizontal position potentiometer (A67r2) are located next to the motors for position recognition.
Note: As of chassis 392659 with CODE (275a) Memory package (driver's seat, steering column, mirrors) the inside rearview mirror memory function is no longer part of the memory package (seat adjustment, steering wheel height adjustment and outside mirror adjustment). The memory feature for the electrical inside rearview mirror can no longer be ordered and is no longer installed in the series production of the models specified above.
Hands-free system microphone group
On vehicles as of 01/09/2003 with telephone or with telephone and voice control system (VCS) a hands-free system microphone group (A67b1) is integrated in the inside rearview mirror (A67). The following functions can be performed via the hands-free system microphone group (A67b1):
- Voice input for making telephone calls using the hands-free system
- Voice input for voice control system (VCS) (interactive dialog with VCS)
The signals are transmitted to the hands-free system control module (A35/1) or the voice control module (A35/11) via the hands-free system microphone group (A67b1).
Removing inside rearview mirror
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- Remove overhead control panel control module with front dome lamp
- Unclip paneling (2) on inside rearview mirror
- Remove paneling (3)
- Remove inside rearview mirror (1) by inserting screwdriver between inside rearview mirror (1) and retaining plate (4) and prying out inside rearview mirror
- Install in opposite order