Slide/tilt sunroof (SHD)

The electric sunroof enables opening, closing and lifting the glass roof placed in the roof opening.

Brief description of components

Sunroof (SHD module)

The following components are integrated in the sunroof module:

• DC motor with attached step-down gear mechanism
  
• Electronic unit
  

The electronic unit controls and monitors all electrical functions of the sunroof.

Hall sensors are integrated in the sunroof module to detect mechanical limit positions.

Operating switch

The operating switch can be moved in three directions. For the positions ”Open” and ”Close”, there are two switching points that enable manual actuation (roof moves as long as the switch is pressed) or automatic function (roof moves automatically to the limit position).

The operating switch is connected by cables with the sunroof module.

Car Access System (CAS)

The Car Access System (CAS) control unit contains the functions of the radio remote control, the ignition switch, the terminal control and the immobiliser. It is also the gateway module between the data buses K-CAN SYSTEM and K-CAN PERIPHERALS.

The CAS routes the requirement for convenience opening or convenience closing of the windows and the sunroof via the data buses.

Main functions

Operations

The following operations are possible:

• Manual closing or opening
  Press the control button forward until it contacts the first switching point (for closing) or backward (for opening). The sunroof is moved as long as the switch is pressed.
  
• Automatic process for opening and closing
  Press the control button beyond the first switching point until it reaches the mechanical stop (towards opening or closing). The sunroof moves automatically to the relevant end position.
  A second operation of the switch interrupts the automatic process immediately.
  NOTE: Automatic closing from the position ”Glass lid lifted” is not possible on vehicles prior to production date 25 February 2002!
  
• Lift
  If the operating switch is pressed towards ”Lift”, the sunroof moves from any position into the tilt position.
  NOTE: Automatic closing from the position ”Glass lid lifted” is not possible on vehicles prior to production date 25 February 2002!
  
• Convenience operation
  In the same way as the power windows, the sunroof is also opened or closed when the buttons on the radio-control key are kept pressed when locking or unlocking the central locking system. The buttons must be pressed until the sunroof reaches the desired position.
  The convenience operation can also run via the door lock on the driver's door. Here, the mechanical key must be held in the positions ”Lock” or ”Unlock” until the sunroof reaches the desired position.
  NOTE: The comfort opening function from the position ”Glass lid lifted” is not possible on vehicles prior to production date 25 February 2002!
  

Anti-trapping protection

To prevent injury due to trapping, anti-trapping protection is active both in the manual and automatic control procedure towards ”Close”. The anti-trapping protection is designed in such a way that in the case of a defined blocking the motion of the sunroof is interrupted independent of the temperature and vehicle voltage. In addition, the sunroof is opened a little to release the blocking.

A requirement for faultless operation of the anti-trapping protection is that the sunroof has been initialised (see chapter on service functions).

NOTE: On vehicles prior to production date 25 February 2002, there is no anti-trapping protection for the function ”Close from lifted position”!

Panic mode

The panic mode serves to close the sunroof very quickly and deactivate the anti-trapping protection.

The panic mode is divided into 2 phases:

• Phase 1:
  Press the control button beyond the first switching point until it reaches the mechanical stop towards ”Close sunroof” and keep it pressed. After a short response time, the sunroof is closed at maximum speed.
  If the switch is released, the sunroof moves more slowly, but in automatic mode up to the ”Closed” position.
  If trapping is detected during the closing operation, the closing procedure is aborted and the sunroof is moved back slightly.
  
• Phase 2:
  If the operating switch is released during phase 1 and within 1 second again pressed into the overpressed position and held there, the sunroof is closed at the maximum possible speed.
  The anti-trapping protection is not active during this phase!
  

Depending on the coding, the following functions are possible:

• Panic mode is in 2 phases (as described)
  
• Panic mode only with phase 2 (as in the case of series 5 E39)
  
• No panic mode available
  

Service functions

Initialisation

The initialisation of the sunroof consists of the following events:

• The standardisation in which the sunroof module registers and stores the mechanical end position of the sunroof in the end position ”Lift”. This end position is used by the module to calculate the remaining end positions.
  
• Learning the characteristic curve in which the sunroof module registers and stores the required force to move the sunroof.
  

Procedure

Initialisation is to be performed as follows:

• Press the operating switch to the ”Lift” position and hold it there
  
• After 15 seconds, the slide/tilt sunroof drive switches on in the ”Lift” direction and runs in the ”Lift” direction. The end position is stored in the module.
  
• In the ”Lift” position, the drive stops for 5 seconds and then runs in the ”Close” direction. In the process, the characteristic curve for ”Close from lift” is learned.
  
• The drive then moves to the end position ”Open”, turns around and moves in the ”Close” direction. In the process, the characteristic curve for ”Close” is learned.
  

The switch must remain pressed during the entire procedure. If the switch is released, the procedure must be repeated.

Important

To ensure that the anti-trapping protection functions reliably, a re-initialisation must be run without fail after any kind of repair work on the sunroof!

If the sunroof has been moved mechanically by means of the emergency control, it is necessary to rerun the standardisation, i.e. the learning of the end position ”Lift”.

Here, the ”Lift” position must be pressed at the operating switch. After 15 seconds, the drive runs to the ”Lift” position. Once the end position has been reached, the switch can be released.