Exterior mirrors: Difference between revisions
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(M21/1m1)/(M21/2m1) and horizontal mirror adjustment motors | (M21/1m1)/(M21/2m1) and horizontal mirror adjustment motors | ||
(in/out) (M21/1m2)/(M21/2m2) in the left and right exterior mirrors. | (in/out) (M21/1m2)/(M21/2m2) in the left and right exterior mirrors. | ||
==Heating left/right exterior rearview mirrors function== | |||
<!-- GF88.79-P-2000S, MODEL 215, 220, Heating left/right exterior rearview mirrors, function, 6.4.98 --> | |||
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|[[File:W220_Heating_left_right_exterior_rearview_mirrors_function.png]] | |||
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* 1 - CAN-message: outside temperature | |||
* 2 - CAN-message: dew point | |||
* 3 - CAN-message: "Generator running (C.61)" | |||
* B14 - Outside temperature sensor | |||
* B31/1 - A/C multifunction sensor | |||
* G2 - Generator | |||
* K40/6 - Left front fuse and relay module | |||
* K40/7 - Right front fuse and relay module | |||
* M21/1r1 - Left mirror heater | |||
* M21/2r1 - Right mirror heater | |||
* N10/6 - Left front SAM control module | |||
* N10/7 - Right front SAM control module | |||
* N22 - A/C pushbutton control module | |||
* N69/1 - Left front door control module | |||
* N69/2 - Right front door control module | |||
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Function prerequisites: | |||
* Voltage not too low or too high | |||
* C.61 ON | |||
The left mirror heater (M21/1r1) in the left electrically adjustable and heated exterior rearview mirror (M21/1) | |||
and the right mirror heater (M21/1r1) in the right electrically adjustable and heated exterior rearview mirror (M21/2) | |||
consist of a heater resistor connected in series with a PTC resistor. | |||
The heater resistor is located on the rear of the mirror glass to which it is permanently bonded. | |||
The power supply and regulated switching on and switching off of the heater resistors | |||
is accomplished by the left front [[door control module]] (N69/1)/right front [[door control module]] (N69/2). | |||
The mirror heater is controlled in relation to the outside air temperature | |||
(CAN message from the left front SAM control module (N10/6)) | |||
and the dew point (CAN message from automatic A/C pushbutton control module (N22)). | |||
Revision as of 23:11, 13 February 2017
Facelift
Parts
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Outside rearview mirror
Part number A2208100576 (left) and A2208100876 (right). The part comes without glass and cover as shown in the picture below. The part is attached to front door using 3 A0029843729 (M4X22) bolts.
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Mirror cover
Part number for mirror cover is A2208100964 (left) and A2208101064 (right). The part comes without turn signal light module.
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Turn signal light
Turn signal light (blinker lamp) has part number A2208200521 (left) and A2208200621 (right).
For the vanity light bulb there is LED upgrade available.
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Adjustment motor
Electronic adjustment motor A2038202242 is used on both sides.
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| Error Code | Generated By | Description |
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| B1208 | DCM-FL - Door control module front left | The signal from component M21/1r3 (Mirror in/out adjustment potentiometer) is faulty. |
Seals
Mirror seals (gaskets) have part number A2208110198 (left) and A2208110298 (right).
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Glass
Original mirror glass is expensive high theft risk part (especially driver's side mirror for option code 249 - INSIDE AND OUTSIDE MIRROR AUTOMATIC DIMMING).
Aftermarket mirrors with heating are available in ebay for as cheap as 15 EUR.
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DIY
Pre-facelift
DIY
- Remove the mirror cover by pressing in a small spring clip at the top.
- Release the mirror housing cover by also pressing in a spring clip near the outer edge.
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.
Adjust left/right exterior mirror function
(Shown on LHS vehicle)
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Function requirements:
- no overvoltage/undervoltage
- Term.15R or 15 ON
The left and right exterior mirrors can be electrically adjusted via the switches in the switch train for exterior mirror adjustment with fold in/out function (S50/1) in the front left door control module (N69/1) (RHS vehicle: Front right door control module (N69/2)). The following settings are possible:
- Horizontal mirror glass adjustment
- Vertical mirror glass adjustment
- Mirror housing folding-in (garage position) and folding-out (driving position)
The adjustments are carried out by the motors in the left electrically adjustable and heated exterior mirror (M21/1) and the right electrically adjustable and heated exterior mirror (M21/2). The motors are actuated via the front left door control module (N69/1) and the front right door control module (N69/2).
The memory function (special equipment) can be used to call up stored mirror settings. Setting the parking position of the exterior mirror on the front passenger's side enables the driver to check the distance of the relevant rear wheel from the edge of the curb when reversing into a parking space.
Fold in left/right exterior mirror function
The left and right exterior mirror housings can be electrically folded in and out. Via the switches in the switch train for exterior mirror adjustment with fold in/out function (S50/1) in the front left door control module (N69/1) (RHS vehicle: Front right door control module (N69/2) ), the left/right exterior mirror housing can be moved to the garage position (mirror housings folded in) or the driving position (mirror housings folded out). The switch statuses of the switches for folding the exterior mirror in (S50/1s4) and the switches for folding the exterior mirror out (S50/1s5) are read in by the front left [[door control module]] (N69/1) (RHS vehicle: Front right door control module (N69/2)) inserted and placed onto the CAN as a message for the door control module on the front passenger's side.
The front left door control module (N69/1) and the front right door control module (N69/2) then actuate the motor for folding the mirror in (M21/1m3) and the motor for folding the mirror in (M21/2m3) in the left and right exterior mirror housings.
Up to 31.05.01 the fold in exterior mirror switch (S50/1s4) or the fold out exterior mirror switch (S50/1s5) must be actuated until the mirror housings are in the desired position.
As of 01.06.01 the fold in exterior mirror switch (S50/1s4) or the fold out exterior mirror switch (S50/1s5) merely have to be touched, and the mirror housings are automatically moved to the desired position.
Exterior rearview mirror adjustment switch
The switches for adjusting the exterior rearview mirrors are located in a separate assembly in the exterior mirror adjustment switch with mirror fold-in/out (S50/1) on the left front door control module (N69/1) (vehicles with right-hand steering : right front door control module (N69/2)).
Left front door control module (N69/1) (left-hand steering)
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The left and right exterior rearview mirror glass can be adjusted in the vertical and horizontal directions with the exterior mirror up/down adjustment switch (S50/1s1) and exterior mirror in/out adjustment switch (S50/1s2). The switch can be set to the exterior rearview mirror to be adjusted with the
All switches for adjusting the exterior rearview mirrors are located in the exterior rearview mirror switch group with fold-in/out feature (S50/1). This switch group is connected to the door control module on the driver's side by a discrete wiring harness.
The switching status of the switches for adjustment of the exterior rearview mirrors is read in by the door control module on the driver's side evaluated and transferred to the CAN bus as a message.
Exterior rearview mirror adjustment motor
The motors for adjusting the mirror glass and housing are located in the left electrically adjustable and heated exterior rearview mirror (M21/1)/right electrically adjustable and heated exterior rearview mirror (M21/2).
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The left exterior rearview mirror glass can be adjusted vertically and horizontally with the vertical mirror adjustment motor (up/down) (M21/1m1) and horizontal mirror adjustment motor (in/out) (M21/1m2) in the left electrically adjustable and heated exterior rearview mirror (M21/1). The right exterior rearview mirror glass can be adjusted vertically and horizontally with the vertical mirror adjustment motor (up/down) (M21/2m1) and horizontal mirror adjustment motor (in/out) (M21/2m2) in the right electrically adjustable and heated exterior rearview mirror (M21/2). The housing of the left/right exterior rearview mirror can be folded in (garage position) and out (driving position) with the mirror fold-in motors (M21/1m3)/(M21/2m3).
The motors are DC motors. Two potentiometers each are located on the motor shafts (M21/1m1)/(M21/2m1) and (M21/1m2)/(M21/2m2) for position recognition. The motors for outside rearview mirror (with fold-in/out feature) (M21/1m3)/(M21/2m3) are not equipped with a position recognition feature.
The motors turn to the left or right depending on the polarity of the actuating voltage. Actuation is accomplished by the left front door control module (N69/1)/right front door control module (N69/2).
Exterior rearview mirror position measurement function
A potentiometer for measuring the position is located on each of the shafts for the vertical mirror adjustment motors (up/down) (M21/1m1)/(M21/2m1) and horizontal mirror adjustment motors (in/out) (M21/1m2)/(M21/2m2) in the left and right exterior mirrors.
Heating left/right exterior rearview mirrors function
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Function prerequisites:
- Voltage not too low or too high
- C.61 ON
The left mirror heater (M21/1r1) in the left electrically adjustable and heated exterior rearview mirror (M21/1) and the right mirror heater (M21/1r1) in the right electrically adjustable and heated exterior rearview mirror (M21/2) consist of a heater resistor connected in series with a PTC resistor. The heater resistor is located on the rear of the mirror glass to which it is permanently bonded. The power supply and regulated switching on and switching off of the heater resistors is accomplished by the left front door control module (N69/1)/right front door control module (N69/2). The mirror heater is controlled in relation to the outside air temperature (CAN message from the left front SAM control module (N10/6)) and the dew point (CAN message from automatic A/C pushbutton control module (N22)).