GF72.29-P-4004B Power Window Pinch Protection, Function

GF72.29-P-4004B Power Window Pinch Protection, Function

Function
The pinch protection feature is only active in combination with the one- touch up/down feature. It only functions in the upper opening area of the window from 4 to 230 mm. The pinch protection is not effective in combination with the manual up/down feature.

If the left front door control module (N69/1)/right front door control module (N69/2) or the rear control module (N22/6) recognizes pinching by comparing the hall signals received (number, pulse duration, space duration) with the stored reference values it stops actuation of the corresponding power window motor (M10/3, M10/4, M10/5, M10/6) and moves the window down approx. 5 cm (reversing feature).

If the power window switch was actuated in the "close" direction at the time pinching was recognized, the window stops rolling up immediately. The window then rolls back down approx. 1 cm when the switch is released.

Reference value adaptation in control module
Since the power window mechanical system becomes hard to move after a certain period of time the door control modules (N69/1, N69/2) and rear control module (N22/6) adapt during each up/down operation in the synchronized state. For this purpose the pulse pattern of the hall signals received (number, pulse duration, space duration) is compared with the last received and stored data (old reference values) and is stored as the new reference if it is within the permissible tolerance range.

This adaptation is not accomplished when
- pinching is recognized,
- the power windows lock up.

The stored values are also maintained following disconnection of the power supply or desynchronization.