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E90 General Vehicle Electrical
Car Access System 2 (CAS2)
The car access system 2 is the master control module for opening and closing the win-
dows.
Footwell Module (FRM)
The relays for the power window motors for the driver's and passenger's side are
installed in the Footwell Module.
Junction Box Electronics Control Module (JBE)
The relays for the power window motors of the rear left/right doors are installed in the
Junction Box Electronics Control Module.
Opening & Closing
The Car Access System 2 is the central control function for electric opening and closing
of the power windows. This means that the CAS2 issues the signal to enable the open
and close function for the power windows. The FRM and the JBE activate the power
window motors.
The FRM and the JBE monitor the motor speed of the respective power window motors.
In this arrangement, the FRM or JBE can respond to overheating or possible blocking of
the power window motors in the event of an object being trapped in the windows.
Opening and Closing
The corresponding power window motor is activated in OPEN or CLOSE direction by
pressing or pulling the power window switches to the first notch position. The power
window motor is driven until the corresponding power window switch is released.
To ensure the power window is closed reliably, the power window motor is briefly driven
to block status at the upper stop.
Opening and Closing with Toll Function
The toll function is implemented for all power windows (window regulators). The corre-
sponding power window motor is driven in OPEN or CLOSE direction by pressing or
pulling a power window switch beyond the limit stop. The power window motor moves
the window automatically until it is completely open or closed. Power window operation
is stopped when the power window switch is pressed or pulled again.
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