Front Door Control Unit, Basic Function - GF72.29-S-9891A

Model All (Light transporter) 

Courtesy of MERCEDES-BENZ USA

Sample illustration of front door control unit 

Overview 

This document contains the following information:

• General 
• Function 
  • Controlling functions 
  • Exception 

General 

The front door control units are located in each case in the door module behind the door trim.

Function 

The front door control units are connected to the network architecture of the vehicle.

The left front door control unit is connected with the following component parts:

• Power window and outside mirror adjustment switch group
• Seat adjustment switch group (vehicles with memory function)
• Seat climate control switch group (vehicles with seat heating and/or seat climate control)
• Left rear door control unit

The right front door control unit is connected with the following component parts:

• Seat adjustment switch group (vehicles with memory function)
• Seat climate control switch group (vehicles with seat heating and/or seat climate control)
• Right rear door control unit

Controlling functions 

The front door control units control the following functions:

• Power window assembly.
• Outside mirror glass adjustment.
• Outside mirror glass heater.
• Outside mirror glass dimming.
• Central locking system.
• Fold in/out outside mirror (vehicles with electrically foldable outside mirrors).

For the implementation of the respective function, the front door control units evaluate - among other things - the following information:

• Terminal status of terminal 15.
• Reverse gear signal engaged.
• Rear window heater signal, switched on.
• Lock/unlock central locking system request.
• PRE-SAFE® adjustment request (vehicles with PRE-SAFE® System).
• Adopt memory position request (vehicles with memory function).
• Convenience feature request.
• Rain closing function request.
• Fold in/out outside mirror request (vehicles with electrically foldable outside mirrors).
• Crash signal.
• Operating requests via respective control elements.
• Status of the microswitches in the door locks.
• Blind Spot Assist warning output request (vehicles with Blind Spot Assist).

The front door control units actuate different actuators in the respective front door and/or transmit the corresponding information and requests to the respectively affected systems. This includes:

• Door status (open/closed).
• Adjust front passenger outside mirror request (left front door control unit).
• Actuate other power window assemblies request (left front door control unit).
• Open/close side window roller sunblinds request (left front door control unit, vehicles with roller sun blinds in rear doors).
• Convenience feature (vehicles with KEYLESS-GO).
• Seat heating and seat climate control request (vehicles with seat heating and seat climate control).
• Seat adjustment request (vehicles with electrical seat adjustment).
• Unlock rear-end door or tailgate request (left front door control unit).
• Power window assembly actuation.
• Outside mirror glass adjustment actuator motor actuation (left front door control unit).
• Fold in/out outside mirror actuator motor actuation (vehicles with electric foldable outside mirrors).

The front door control units also protect the respective power window motor against overheating.

The software simulates temperature characteristics depending on the operating time. The necessary parameters for this are stored in the respective front door control unit.

If the overheating protection is triggered, the actuation of the affected power window motor is blocked for a minimum cooling time.

Exception: 

The overheating protection function does not operate during roof reversal (after a blockage is detected).

	Component descriptions
	Component description for left front door control unit	Model 447 with code XM7 (MOPF II)	GF72.29-S-6001A
	Component description for right front door control unit	Model 447 with code XM7 (MOPF II)	GF72.29-S-6009A