Safety functions
- Obstruction detection for mirror fold-in function:
The door modules or the body gateway module (from 09/2005) have an obstruction detection circuit as protection against overloading.
If the drive is blocked, the current flow in the engine increases. The control units compare the starting current in normal operating mode with the current in the obstructed drive. An obstruction is detected by any difference in the current. The motor is no longer driven.
- Anti-repeat circuit:
To provide overheating protection for the motor the mirror folding function is locked after it has been working for a total of 45 seconds.
If the anti-repeat circuit is active, the exterior mirrors can be unfolded once more.
- Undervoltage shutdown:
- up to 09/2005
The power supply to the exterior mirrors is monitored in the door module. All exterior mirror functions are locked if the voltage drops below 8.5 V.
The functions are available again when the voltage rises above 9 V.
- from 09/2005
The exterior mirrors and the driver's door switch block have a direct power supply.