Safety functions

WARNING: This page does not describe the selected car, but rather 21 other vehicles, including the 2006 BMW Z4, 2006 BMW M3, 2006 BMW M Roadster, 2006 BMW M Coupe, and 2006 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.

Block detection for mirror folding function:
Each door module has lock detection to protect the motors from overload.

If the drive is obstructed, the current in the motor increases. The door modules 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.
Repeat lock:
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 repeat lock is active, the door mirrors can be unfolded once more.
Undervoltage shutdown:
The power supply to the door mirrors is monitored in the door module. All door mirror functions are locked if the voltage drops below 8.5 V. The functions are available again when the voltage rises above 9 V.