Driver's Door Switch Block: E60, E61, E63, E64
Installation location
The switch block in the driver's door is built into the interior door handle (E60, E61 illustrated).
Design
| Key | Explanation | Key | Explanation |
|---|---|---|---|
| 1 | Exterior mirror adjustment | 2 | Switches between exterior mirrors |
| 3 | Power window switch for front-passenger door | 4 | Passenger-side rear door power window switch |
| 5 | Roller sunblind button for the rear window | 6 | Child proof locks for rear power windows |
| 7 | Driver-side rear door power window switch | 8 | Power window switch for driver's door |
| 9 | Button for folding exterior mirrors in/out |
The switch block in the driver's door is firstly connected via a LIN bus (LIN = Local Interconnect Network) to the driver's door module (TMFA). The switch block in the driver's door is the central operating point for the power windows. In addition, operation of the exterior mirrors and the roller sunblind for the rear window is integrated here (in the E64 there are also functions for the fully automatic soft-top).
How it works
The power window switches have 2 functional stages for pushing and pulling:
- Functional stage 1: Switch as far as the pressure point
The power window motors are activated until the switch is released. The power window stops immediately the switch is released. The power window motor switches off in the end positions. As soon as the window reaches the end position, the power window motor is no longer powered.
- Functional stage 2: Switch beyond the pressure point
The position beyond the pressure point is also known as the one-touch function. The power window motors are automatically run to the end position once the button has been pressed beyond the pressure point. This automatic movement of the power windows may be halted by pressing the power window switch again.
The signals between the switch block in the driver's door and the driver's door module (TMFA) are transmitted on the LIN bus. LIN means: Local Interconnect Network. The LIN bus is a standardized serial single-wire bus used in the automobile industry. The data transfer rate for the LIN bus can be up to 19.2 k Baud.
> Up to 09/2005
Example for a signal path: Opening driver's door side window using switch block in driver's door
| Key | Explanation | Key | Explanation |
|---|---|---|---|
| 1 | Switch block in driver's door | 2 | Driver's door module (TMFA) |
| 3 | Safety and gateway module (SGM) | 4 | Car Access System (CAS) |
| 5 | Power window motor in driver's door |
Operation of the power window switch is signalled via the LIN bus to the driver's door module (TMFA). The driver's door module (TMFA) sends the signal via byteflight to the safety and gateway module (SGM). The safety and gateway module translates the signal. Then the signal is sent on the K-CAN to the CAS control unit = master control unit for the power windows). The CAS control unit evaluates the signal. The CAS control unit sends a command to the SGM on the K-CAN. The SGM transfers the command via byteflight to the driver's door module (TMFA). The driver's door module activates the power window motor in the driver's door. The driver's door module (TMFA) calculates the following from the Hall sensor signals in the power window motor:
- Direction of rotation
- Speed
- Position
If necessary, the anti-trap function is enabled.
> From 09/2005
The driver's door switch block is directly connected to the body gateway module (KGM) via the LIN bus. The door modules and the byteflight are discontinued.