The mirrors are adjusted electrically by means of the door modules for the driver's and passenger's doors. The adjustment switch is located in the door module on the driver's door.
Switch operation is signalled via the P-bus. The door module drives the adjustment motors in the mirrors by means of semiconductor bridges.
Electric motors are installed in the mirror housing for horizontal and vertical adjustment.
If the vehicle is equipped with a seat/steering column memory the mirror positions are registered and stored accordingly.
The seat/steering column memory features its own module (its own diagnosis program) which is linked via the K-bus to the general module of the ZKE. The positions for the seat and steering column are registered and stored in this module.
Parallel to this, the mirror positions are stored in the door modules.
The mirror positions are detected by means of potentiometers which are installed on the mirror drive.
The memory is controlled by means of the memory switch connected to the module for the seat/steering column memory. The switch positions of the memory switch are transferred via the K-bus to the general module and from here further via the P-bus to the door modules.
Mirror heating is controlled by the door modules. The heating function is active as of terminal 15 (ignition lock position 2). The activation time is dependent on the outside temperature.
The general module receives the outside temperature from the IKE via the K-bus and determines a cycle time for heating operation. This time is transferred to the peripheral modules where it is carried out. Heating is no longer active at an outside temperature greater than 25 o C and it is switched on permanently at a temperature lower than -10 o C.
The electric motor drive is used to fold in the outside mirrors in the opposite direction of driving.
The button to fold in the mirrors is located in the door module on the driver's door. The button signal is routed via the P-bus to the door module in the front passenger's door. Depending on the position of the mirrors, they are then folded in or out accordingly.
If a mirror is mechanically folded in, either by hand or due to an impact, it is mechanically uncoupled from the fold-in drive. A microswitch is installed in the mirror which recognizes this uncoupling and switches a ground signal to the appropriate peripheral module.
If a mirror which has been mechanically uncoupled is activated by the button being pressed, the fold-in motor will move the mirror in the fold-out direction until the microswitch registers the mirror being engaged mechanically. The maximum activation time of the motor is 15 seconds.
Since the mirror fold-in motors block when operated, thermal overloading is possible if operated frequently. In order to avoid overloading, a repeat lockout is provided which blocks the fold-in motors for 3 minutes after 6 operating attempts within 1 minute.