Exterior mirrors

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Description

Facelift vehicles compared to pre-facelift vehicles have differences exterior mirror appearance and mechanism.

Exterior mirror of facelift vehicle.
Exterior mirror of pre-facelift vehicle.

Parts (facelift)

Left outside rearview mirror (from EPC).
Right outside rearview mirror (from EPC).

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.

Rearview mirror (A2208100876).
Holes in the door.

Mirror cover

Part number for mirror cover is A2208100964 (left) and A2208101064 (right). The part comes without turn signal light module.

A2208100964 (front).
A2208100964 (back).
A2208100964 (vanity light opening).

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.

A2208200621 (front).
A2208200621 (back).

Adjustment motor

Electronic adjustment motor A2038202242 is used on both sides.

A2038202242 (front).
A2038202242 (back).
A2038202242 (connector pins).
A2038202242 opened (outside).
A2038202242 opened (inside).
Error Code Generated By Description
B1208 DCM-FL - Door control module front left The signal from component M21/1r3 (Mirror in/out adjustment potentiometer) is faulty.

Gasket

Mirror gasket (seal) part number is A2208110198 (left) and A2208110298 (right).

Gaskets A2208110198 and A2208110298.
Worn gasket.

Glass

Original mirror glass is expensive high theft risk part (especially driver's side mirror glass for option code 249 - INSIDE AND OUTSIDE MIRROR AUTOMATIC DIMMING).

Aftermarket mirror glasses with heating are available in ebay for as cheap as 15 EUR.

A2208101321 with dimming for LHD vehicles.
A2208101821 (front).
A2208101821 (back).

Adjust left/right exterior mirror function

(Shown on LHS vehicle)

W220 Adjust left right exterior mirror function.png
  • 1 - CAN message: "Left exterior mirror to left/right/up/down"
  • M21/1 - Left exterior mirror, electrically adjustable and heated
  • M21/2 - Right exterior mirror, electrically adjustable and heated
  • N69/1 - Door control module front left
  • N69/2 - Door control module front right
  • S50/1 - Switch for exterior mirror adjustment with fold in/out function

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.

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)

W220 Exterior rearview mirror adjustment switch location photo.jpg W220 Exterior rearview mirror adjustment switch location.png
  • S50/1 - Exterior mirror adjustment switch with mirror fold-in/fold-out feature
  • S50/1s1 - Exterior mirror adjustment up/down switch
  • S50/1s2 - Exterior mirror adjustment left/right switch
  • S50/1s3 - Exterior mirror changeover switch to left mirror
  • S50/1s4 - Exterior mirror fold-in switch
  • S50/1s5 - Exterior mirror fold-out switch
  • S50/1s6 - Exterior mirror changeover switch to right mirror

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 mirror adjustment switch.
  1. Driver's side exterior rear view mirror button
  2. Passenger-side exterior rear view mirror button
  3. Adjustment button

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).

W220 Exterior rearview mirror adjustment motor location.png
  • M21/1 - Left electrically adjustable and heated exterior rearview mirror
  • M21/1m1 - Vertical mirror adjustment motor (up/down)
  • M21/1m2 - Horizontal mirror adjustment motor (in/out)
  • M21/1m3 - Mirror fold-in motor
  • M21/2 - Right electrically adjustable and heated exterior rearview mirror
  • M21/2m1 - Vertical mirror adjustment motor (up/down)
  • M21/2m2 - Horizontal mirror adjustment motor (in/out)
  • M21/2m3 - Mirror fold-in motor

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.

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.

Heating left/right exterior rearview mirrors function

W220 Heating left right exterior rearview mirrors function.png
  • 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

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)).

Automatic dimming feature for exterior rearview mirror on driver's side function

For vehicles with option code 249 - INSIDE AND OUTSIDE MIRROR AUTOMATIC DIMMING the exterior rearview mirror on driver's side (M21/1) can be dimmed electro-chromatically.

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).

W220 mirror automatic dimming feature.png
  • 1 - CAN-message: "Shift lever position"
  • 2 - CAN-message: "Reverse gear engaged"
  • A67 - Interior rearview mirror unit
  • M21/1 - Left electrically adjustable and heated exterior rearview mirror
  • M21/2 - Right electrically adjustable and heated exterior rearview mirror
  • N15/5 - Electronic shift lever module control module
  • N70 - Overhead control panel control module
  • N73 - Electronic ignition/starter switch control module

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.

DIY

Remove/install complete outside mirror

Shown on model 220 as of VIN 316717 (facelift):

W220 Remove install complete outside mirror 1.jpg
  • 7 - Screw
  • 8 - Bolts

Shown on model 220 up to VIN 316716 (pre-facelift):

W220 Remove install complete outside mirror 2.png W220 Remove install complete outside mirror 3.jpg
  • 1 - Trim strip
  • 2 - Door control unit cover
  • 4 - Door lining
  • 5 - Mounting wedge
  • N69/1 - Left front door control unit
  • N69/2 - Right front door control unit

Shown on model 220 As of VIN 316717 (facelift):

W220 Remove install complete outside mirror 4.jpg
  • 6 - Outside mirrors
  • 9 - Connectors
  • 10 - Sheet metal flap
  • 11 - Cord
  1. Remove paneling on outside mirror
  2. Fold outside mirror (6) manually toward front and unscrew bolt (7)
  3. Fold outside mirror (6) electronically toward rear and unscrew bolt (8)
  4. Press door control unit cover (2) off of door lining (4) with mounting wedge (5). The mount was modified with model refinement as of VIN 316717 (facelift).
  5. Disconnect connector (9) from left front door control unit (N69/1) or right front door control unit (N69/2). Only outside mirrors with EC dimming (2 connectors) are delivered as replacement parts. On vehicles without EC dimming fasten connector (9) not required to wiring harness (tie strap or insulating tape).
  6. Bend sheet metal cap (10) toward inside to achieve more space for lines and connectors (9).
  7. Fasten cord (11) to connectors (9) with friction tape.
  8. Pull outside mirror (6) out of door with electrical lines without damaging them.
  9. Remove cord (11) from connectors
  10. Remove outside mirror (6)
  11. Install in the reverse order

Remove/install gasket on outside mirror

W220 Remove install gasket on outside mirror.jpg
  • 1 - Old gasket
  • 2 - New gasket
  • 3 - Vapor barrier
  • 4 - Remaining piece
  • M21/1 - Left electrically adjustable and heated outside mirror
  • M21/2 - Right electrically adjustable and heated outside mirror
  • A - Recess
  • B - Separation line
  1. Completely remove left electrically adjustable and heated outside mirror (M21/1) or right electrically adjustable and heated outside mirror (M21/2)
  2. Remove vapor barrier (3). Note correct installation positions.
  3. Lay new gasket (2) over old gasket (1) of left electrically adjustable and heated outside mirror (M21/1) or right electrically adjustable and heated outside mirror (M21/2).
  4. Mark cutout (A) for new gasket (2) on old gasket (1).
  5. Remove new gasket (2)
  6. Increase cutout transferred to old gasket (1) by dimension min. 5 mm. and mark cutting line (B).
  7. Cut off gasket (1) off along cutting line (B) and remove outer part from old gasket (1).
  8. Cut elevations off of remaining piece (4) remaining on left electrically adjustable and heated outside mirror (M21/1) or right electrically adjustable and heated outside mirror (M21/2) on old gasket (1). The remaining piece (4) should not have elevations, otherwise the remaining piece (4) and new gasket (2) will not seal properly with one another.
  9. Install new gasket (2) on left electrically adjustable and heated outside mirror (M21/1) or right electrically adjustable and heated outside mirror (M21/2).
  10. Insert vapor barrier (3)
  11. Completely install left electrically adjustable and heated outside mirror (M21/1) or right electrically adjustable and heated outside mirror (M21/2).

Note: You need to keep the old gasket, a part of it is used to seal the hole. The new gasket needs the piece from the old one around the wires. And when you do cut it from the old one make sure you cut it larger than the hole in the new gasket, so when it is installed it seals over the whole area.

Remove/install outside rearview mirror cover

Shown on model 220 as of VIN 316717 (facelift):

W220 Remove install outside rearview mirror cover 2.jpg
  • 1 - Paneling
  • 4 - Outside mirrors
  • 7 - Upper catch spring

Shown on model 220 up to VIN 316716 (pre-facelift):

W220 Remove install outside rearview mirror cover 1.jpg
  • 1 - Paneling
  • 2 - Bottom catch spring
  • 3 - Turn signals
  • 4 - Outside mirrors
  • 5 - Turn signal connector on outside rearview mirror
  • 6 - Turn signal connector in outside rearview mirror covering
  1. Remove mirror glass
  2. Facelift: Release top catch spring (7). Pre-facelift: release bottom catch spring (2).
  3. Remove paneling (1)
  4. Pre-facelift: move bottom catch spring (2) to initial position.
  5. Pre-facelift: check position of connector for turn signal on outside rearview mirror (5) and turn signal connectors in outside rearview mirror covering (6). If the connectors are not in the correct position, damage can occur when the covering (1) is installed.
  6. Push on paneling (1). Ensure that the covering (1) is arrested in the end position by the top catch spring (7) for facelift or bottom catch spring (2) for pre-facelift.
  7. Pre-facelift: Ensure that the turn signal connector is connected properly to the outside rearview mirror (5).
  8. Check for proper function

Removing and installing auxiliary turn signal lamp

Illustrated on facelift vehicle:

W220 Removing and installing auxiliary turn signal lamp facelift.jpg
  • E6/5 - Left exterior mirror turn signal lamp
  • E6/6 - Right exterior mirror turn signal lamp
  • M21/1e1 - Left outside mirror ambient lamp
  • M21/2e1 - Right outside mirror ambient lamp

Illustrated on pre-facelift vehicle:

W220 Removing and installing auxiliary turn signal lamp prefacelift.jpg
  • 1 - Screws
  • 2 - Cover
  • 3 - Guides
  • E6/5 - Left exterior mirror turn signal lamp
  • E6/6 - Right exterior mirror turn signal lamp
  1. Remove covering on exterior rearview mirror
  2. Pre-facelift: unscrew screws (1).
  3. Pre-facelift: remove cover (2) with guides (3) from covering. Installation: Ensure that guides (3) are correctly seated in cover.
  4. Facelift: pull out outside mirror ambient lamp bulb.
  5. Remove left/right exterior mirror turn signal lamp (E6/5, E6/6) from covering
  6. Install in opposite order
  7. Check for proper function

Remove/install mirror glass

Shown on model 220 as of VIN 316717 (facelift):

W220 Remove install mirror glass 2.jpg
  • 1 - Retaining spring
  • 2 - Connector
  • 3 - Mirror lens

Shown on model 220 up to VIN 316716 (pre-facelift):

W220 Remove install mirror glass 1.jpg
  • 1 - Mirror lens
  • 2 - Retaining spring
  • 3 - Connector
  • 4 - Support spring
  • 5 - Retaining lugs
  • 6 - Clamp
  1. Pre-facelift: remove covering on outside rearview mirror.
  2. Unhook retaining spring (2).
  3. Facelift: Remove mirror glass (1) from drive.
  4. Pre-facelift: Press clip (6) in direction of arrow and remove mirror glass (1) from drive. Do not break off clip (6). Installation: First hook in mirror glass (1) at bottom with retaining lugs (5) into retaining pockets (arrows) on drive. Observe support springs (4).
  5. Disconnect coupling (3)
  6. Install in the reverse order

Removing and installing mirror adjustment drive motor

W220 Removing and installing mirror adjustment drive motor.jpg
  • 1 - Mirror adjustment motor
  • 2 - Screws
  • 3 - Connector
  1. Remove cover on outside rearview mirror
  2. Remove mirror glass
  3. Unscrew screws (2)
  4. Remove mirror adjustment motor (1)
  5. Disconnect connector (3)
  6. Install in opposite order

Resources

Remove mirror (facelift).
Remove mirror cover (pre-facelift).