Door modules

The door modules register the signals of the switches and sensors installed in the doors and control the drives installed in the doors. Information is received and sent via the K-CAN PERIPHERALS data bus.

The functions differ in the individual door modules depending on the vehicle equipment and installation position.

The door modules are connected to the switch blocks in the doors by a one-wire data bus.

Components and functions

Switch block, driver's door

From the switch block in the driver's door, functions are operated with the following control elements:

• Adjusting switch for mirror adjustment
  
• Button for folding mirror (special equipment)
  
• Outside mirror selection switch (slide switch for outside mirror operation on driver or passenger side)
  
• Control button for rear-window roller blind
  
• Child lock switch for rear power windows
  

Switch block in rear of car interior (in the case of special equipment roller sunblind)

In the case of special equipment with side window roller sunblind, a switch block is fitted in place of the autonomous power window switch in the rear doors. The signal transfer to the door module is across a one-wire data bus.

The functions are operated using the following switches and buttons:

• Switch for power window
  
• Buttons for side window roller sunblinds
  
• Button for rear window roller
  
• selection switch for roller sunblind operation: left-hand side or right-hand side
  

Power windows

For the function of the power windows, each door module measures:

• the voltage supply of the power window
  
• the direction of rotation and the speed of the power window motor
  
• the required actuating force of the power window motor
  
• the position of the window pane.
  

In the interplay of the power window mechanism with the electronics unit and the door module, the following functions are possible:

• Manual operation (first detent)
  
• One-touch function (second detent)
  
• Convenience opening and convenience closing (all windows are activated simultaneously by the remote control or the locking cylinder)
  
• Emergency closing (closing the windows without anti-trapping protection)
  
• Anti-trapping protection
  
• End-position cut-out
  
• Soft ON/OFF (soft start-up of the power windows on closing and opening)
  
• Speed-controlled opening and closing of the windows
  
• Protection of the drive against overheating
  
• Child safety lock
  
• Country-specific versions
  
• Diagnosis via sensor wires (for interruption and short circuit; not for ohmic loads)
  

System lock

At the system lock, the door module controls the functions:

• central locking system (control from CAS, Car Access System)
  
• SCA Soft Close Automatic
  
• Electrical opening of the doors (in the case of special equipment Passive Access)
  

Door light

The door module controls the functions of the door light:

• Door entry lighting
  
• Ambient light (brightness adjustable by means of knurled wheel, controlled from the light module)
  
• Courtesy lighting
  
• Cold and hot monitoring of the light sources
  

Mirror adjustment and folding mirror

The front door modules control the adjustment drives in the outside mirrors and the drive for the folding mirror function.

Mirror heating

The data for the mirror heating is supplied to the front door modules via the data bus K-CAN PERIPHERIE. The heat output is controlled via the outside temperature and wiper operation.

Electrochromic exterior mirror

For the function ”automatic darkening” of the outside mirrors, 2 cables are looped through the front door modules. The function is controlled through the inside mirror.