Door control module

Door control module (in WIS) or Electric Seat Adjuster Switch (in EPC) is electrical part responsible for several tasks. When looking for part in catalogs, you may need to add color code to end of the part number (e.g., A22082106587C45).

Functionality

The door control module in itself is a pretty dumb device. All key presses are sent over CANBUS to SAM. SAM then broadcasts message to all modules and module which understands the message acts appropriately (whether lighting up some bulb, engaging seat heating, moving seat, etc.).

DCM is responsible for:

External mirror:
- Lighting up mirror turn signal light
- Lighting up mirror courtesy light
- Mirror heating
- Mirror angle altering
- Mirror fold-in
Receiving signal from infrared receiver
Engaging door power close
Opening door window
Receiving signal from window control switch
receiving signal from trunk open switch
Receiving signal from mirror control switch
Powering door handle LED
Powering door courtesy light
Receiving signal from seat regulation switch

Power for driver side front DCM is controlled by fuse X.

Location

DCM is located in door trim held by plastic clips.

Connectors

Seat Adjustment

The seat adjustment switches are located on the front doors.

Head restraint height
Seat height
Seat cushion tilt
Seat cushion depth
Seat fore and aft adjustment
Seat backrest tilt

Mirror Adjustment

Driver’s side exterior rear view mirror button
Passenger-side exterior rear view mirror button
Adjustment button

Mirror adjustment switch is not part of DCM, but connects to it.

Seat ventilation

All W220s are equipped with seat heating feature for front seats. Vehicles with option code 401 are equipped also with seat ventilation feature.

Seat ventilation functionality does not depend on DCM. Appropriate buttons are not part of DCM and can be bought separately.

A2208210358 -- Heated seat button for left DCMs.
A2208210458 -- Heated seat button for right DCMs.
A2208210558 -- Heated and ventilated seat button for left DCMs.
A2208210658 -- Heated and ventilated seat button for right DCMs.

Memory seats

Memory seat function is determined by DCM itself. Even more, by controls board.

It has been tested that vehicle originally equipped with DCM A2208214179 in drivers doors can be replaced with DCM A2208211579 and memory seats will work out of the box. To mount DCM with memory buttons appropriate door panel with holes for memory buttons must be mounted. Alternatively, if memory functionality is not needed, one can replace front control board connected by wire with control board from A2208214179.

Using right hand drive DCM in left hand drive vehicle

It has been tested that RHD DCM A2208212179 installed on left side of LHD vehicle originally equipped with A2208214179 will work fine, however, the mirror controlling switch will not work and window controlling switch will be able open only driver's door window. Similarly, RHD DCM A2208211879 installed on left side of LHD vehicle originally equipped with A2208214979 will work fine, however, the window opening switch will open left side driver's door window.

Using left DCM on the right side

The physical location of DCM is programmed into DCM. E.g., if left DCM is connected to right side, the DCM will still move left seat.

Using pre-facelift DCM in facelift vehicle

Has not been tested.

List of door control modules

Facelift (from 30/09/2002)

Front Left

Part No.	Front	Back	Controls board	Board side A	Board side B
A2208214179 (left hand drive vehicles)
A2208211579 (left hand drive vehicles)
A2208214479 (right hand drive vehicles)
A2208212179 (right hand drive vehicles)

Front Right

Part No.	Front	Back	Controls board	Board side A	Board side B
A2208214979 (left hand drive vehicles)
A2208211679 (left hand drive vehicles)
A2208215079 (right hand drive vehicles)
A2208211879 (right hand drive vehices)

Rear Left

Part No.	Front	Back	Controls board	Board side A	Board side B
A2208216279
A2208215779
A2208212379
A2208212779 (right hand drive vehicles)

Rear Right

Part No.	Front	Back	Controls board	Board side A	Board side B
A2208216879
A2208216379
A2208212479
A2208212879 (left hand drive vehicles)

Pre-facelift (to 01/09/2002)

Front Left

Part No.	Front	Back	Controls board	Board side A	Board side B
A2208208710 (left hand drive vehicles, to date 29/07/1999, replaced by A2208218751)
A2208218751 (left hand drive vehicles, to date 30/06/2011)
A2208212958 (left hand drive vehicles, from date 30/06/2001 to date 01/09/2002)
A2208200110 (left hand drive vehicles, to date 29/07/1999, replaced by A2208219351)
A2208219351 (left hand drive vehicles, to date 30/06/2001)
A2208213358 (left hand drive vehicles, from date 30/06/2001 to date 01/09/2002)
A2208208910 (right hand drive vehicles, to date 30/06/2001, replaced by A2208219151)
A2208219151 (right hand drive vehicles, to date 30/06/2001)
A2208213158 (right hand drive vehicles, from date 30/06/2001 to date 01/09/2002)
A2208202610 (right hand drive vehicles, to date 30/06/2001, replaced by A2208219751)
A2208219751 (right hand drive vehicles, to date 30/06/2001)
A2208213758 (right hand drive vehicles, from date 30/06/2001 to date 01/09/2002)

Front Right

Part No.	Front	Back	Controls board	Board side A	Board side B
A2208208810 (left hand drive vehicles, to date 30/06/2001, replaced by A2208219251)
A2208219251 (left hand drive vehicles, to date 30/06/2001)
A2208213258 (left hand drive vehicles, from date 30/06/2001 to date 01/09/2002)
A2208200110 (left hand drive vehicles, to date 30/06/2011, replaced by A2208219851)
A2208219851 (left hand drive vehicles, to date 30/06/2011)
A2208213858 (left hand drive vehicles, from date 30/06/2001 to date 01/09/2002)
A2208209010 (right hand drive vehicles, to date 29/06/1999, replaced by A2208218851)
A2208218851 (right hand drive vehicles, to date 01/09/2002)
A2208202710 (right hand drive vehicles, to date 30/06/2011, replaced by A2208219451)
A2208219451 (right hand drive vehicles, to date 30/06/2011)
A2208213458 (right hand drive vehicles, from date 30/06/2001 to date 01/09/2002)

Rear Left

Part No.	Front	Back	Controls board	Board side A	Board side B
A2208214351 (to date 30/06/2001, replaced by A2208211558)
A2208211558 (to date 30/06/2001, replaced by A2208214958)
A2208214958
A2208203310 (to date 30/06/2011, replaced by A2208210958)
A2208210958 (to date 30/06/2011, replaced by A2208214758)
A2208214758
A2208200310 (to date 30/06/2011, replaced by A2208211358)
A2208211358 (to date 30/06/2011, replaced by A2208215158)
A2208215158
A2208214551 (right hand drive vehicles, replaced by A2208218351)
A2208218351 (right hand drive vehicles, replaced by A2208215558)
A2208215558 (right hand drive vehicles)

Rear Right

Part No.	Front	Back	Controls board	Board side A	Board side B
A2208214451 (to 30/06/2001, replaced by A2208211658)
A2208211658 (to 30/06/2001, replaced by A2208215058)
A2208215058
A2208203410 (to 30/06/2001, replaced by A2208211058)
A2208211058 (to 30/06/2001, replaced by A2208214858)
A2208214858
A2208200410 (to 30/06/2001, replaced by A2208211458)
A2208211458 (to 30/06/2001, replaced by A2208215258)
A2208215258
A2208214651 (left hand drive vehicles, replaced by A2208218451)
A2208218451 (left hand drive vehicles, replaced by A2208215658)
A2208215658 (left hand drive vehicles)