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E90 General Vehicle Electrical
Load Shut-down, Terminal 50
To protect the battery, operation of the power windows is interrupted during the vehicle
start procedure.
The CAS2 revokes the enable for power window operation, in order to interrupt current
operation of the power windows.
The signal is received by the FRM and JBE via the K-CAN. The power window switches
must be pressed again following an interruption in operation. The corresponding function
is not executed if the power windows are operated during the start procedure.
The enable for operation of the power windows is not issued until the start procedure has
been completed.
Thermal Protection of Power Window Motors
The FRM and the JBE monitor the power window motor temperature. The motor tem-
perature is determined based on the outside temperature, motor running time and the
time the motor is stationary (not operative).
Each motor can be switched off individually to prevent the power window motors over-
heating during operation of the power windows (window regulators). The motor is then
deactivated for a defined period of time.
The thermal protection function does not prevent the windows from being opened in the
case of trapping. Once started, a power window function is not interrupted by the ther-
mal protection facility.
In panic mode the window can still be closed even when the thermal protection function
is active.
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