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

Model All (4xWD, CAR) 

Courtesy of MERCEDES-BENZ USA

Sample illustration of front door control unit 

Overview 

This document contains information on:

• General 
• Function 
  • Networking 
  • Controlling functions 
  • Evaluated information 
  • Actuation 

General 

The driver's and front-passenger door control units (1, 2) evaluate the requests from the equipment-dependent consumers (e.g. seat adjustment switch group) and pass these onto the signal acquisition and actuation module.

Function 

Networking 

The driver's door and front-passenger door control units (1, 2) are connected to the network architecture of the vehicle.

The driver's door control unit (1) is connected to 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 front-passenger door control unit (2) is connected to 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 driver's door and front-passenger door control units (1, 2) control the following functions:

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

Evaluated information 

For the implementation of the respective function, the driver's door and front passenger door control units (1, 2) 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.
• Status of the power closing function microswitches (vehicles with power closing function).
• Blind Spot Assist warning output request (vehicles with Blind Spot Assist).

Actuation 

The driver's door and front-passenger door control units (1, 2) actuate different actuators in the respective front door and/or transmit corresponding information and requests to the respectively affected systems. This includes:

• Door status (open/closed).
• Adjust front passenger outside mirror request (driver's door control unit (1)).
• Actuate other power window assembly request (driver's door control unit (1)).
• Open/close side window roller sunblinds request (driver's door control unit (1), vehicles with roller sunblinds 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 trunk lid or tailgate request (driver's door control unit (1)).
• Power window assembly actuation.
• Power closing function motor actuation (vehicles with power closing function).
• Outside mirror glass adjustment actuator motor actuation (driver's door control unit (1)).
• Fold in/out outside mirror actuator motor actuation (vehicles with electric foldable outside mirrors).

The driver's door and front-passenger door control units (1, 2) 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 214	GF72.29-P-6001K
		Model 294	GF72.29-P-6001N
		Model 192	GF72.29-P-6001R
	Component description for right front door control unit	Model 214	GF72.29-P-6009K
		Model 294	GF72.29-P-6009N
	Door control unit component description	Model 223	GF72.29-P-2011A
		Model 243	GF72.29-P-2011B
		Model 206	GF72.29-P-2011C
		Model 297	GF72.29-P-2011D
		Model 295	GF72.29-P-2011E
		Model 232	GF72.29-P-2011F
		Model 296	GF72.29-P-2011G
		Model 254	GF72.29-P-2011H
		Model 118 as of model year 2023 Model 177, 247 as of model year 2022	GF72.29-P-2011L
		Model 167 as of model year 2023	GF72.29-P-2011M