Indirect Pressure-sensitive Finger Guard

Essentially, the indirect pressure-sensitive finger guard does not prevent an object being trapped but rather it limits the trapping force to maximum 80 N. The power window motor is reversed on exceeding this trapping force.

The footwell module and the junction box electronics monitor the activated power window motors. The indirect pressure-sensitive finger guard for the front windows is activated by the footwell module. The indirect pressure-sensitive finger guard for the rear windows is activated by the junction box electronics.

The indirect pressure-sensitive finger guard in the E90 is based on the evaluation of the Hall pulses from the power window motors. The speed is derived from the Hall pulses of the power window motors. Speed fluctuations within certain ranges trigger the indirect pressure-sensitive finger guard so that the windows are opened. Operation of the power window switches is ineffective while the windows are in the process of opening.

If no operable pressure-sensitive finger guard is detected as the result of defective Hall sensors, the window can only be operated in jolts. The power window is in emergency mode and must be reinitialized.

NOTE: The initialization procedure is described in the Service Information.

The customer is shown a Check Control message.

CHECK CONTROL MESSAGE REFERENCE CHART

Check Control message	Meaning	Information on the central information display
	Power window pressure-sensitive finger guard!	Power window pressure-sensitive finger guard deactivated.
	Power window pressure-sensitive finger guard!	Power window pressure-sensitive finger guard failed. Ask your nearest BMW Service to check this.