Window Motor Limit Stop Function - BMW 5251 Service Manual

Door
windows1
Window motor limit stop function
If repeated window activation (upldown cycles) exceeds one
minute, the GM I l l deactivates the internal relays and disre-
gards any further upldown requests. The GM I l l provides mo-
tor activation after a short duration but not for the full one
minute monitoring cycle.
The GM I l l monitors the number of times a window motor is
activated. It counts each cycle and stores the number in
memory. Afler the stop function limit is reached and the win-
dow motor is deactivated, the GM I l l slowly reverses the
stored count of activation until the stored number equals
0 ,
thus allowing the window motor to cool down.
WARNING-
* Always wear hand and eye protection when working with
brolen glass.
If a window is brolen, all of the glass bits should be
vacuumed out of the door cavity. Use a blunt so-ewdi-iv-
er to clean out any remaining glass pieces from the
window guide rails.
When servicing the door windows, the harness con-
nector to the window regulator should always be dis-
connected to prevent pinching fingers in the moving
window mechanism.
Sedan and Sport Wagon doors are similar. Use the following
procedures for window service on these models.
WARNING-
E39 cars are iitted with side-impact airbags in the front
doors. Some are equipped with airbags in the rear doors
as well. When servicing the door windows on cars with
side-impact airbags, always disconnect the negative ( - )
battery cable. See 721 Airbag System (SRS) for cau-
tions and procedures relating to the airbag system.
*
Prior to disconnecting the battery, read the battery dis-
connection cautionsgiven 001 General Warnings and
Cautions.