83
E90 General Vehicle Electrical
Slide/tilt Sunroof Motor
The FZD activates the integrated relays when it receives the request for the slide/tilt sun-
roof. The sunroof motor receives its voltage supply via the relays. The FZD monitors the
relay contacts to ensure trouble-free control of the motor and therefore of the slide/tilt
sunroof. In addition, the motor speed is calculated from the pulses of the Hall sensors
and the direction of rotation of the corresponding motor.
The distance the slide/tilt sunroof must cover during the opening or closing procedure is
defined in the FZD. The sunroof motor generates a certain number of pulses within this
range and therefore recognizes the end positions of the slide/tilt sunroof.
Anti-trapping Protection
The indirect anti-trapping function is determined on the basis of the power intake of the
sunroof motor. The anti-trapping function is triggered if the closing force increases by 80
to 90 N and the sunroof is moved back by approx. 200 mm.
Blocking Protection
The FZD detects blocking if the pulses from the Hall sensor fail for more than 500 ms
during the opening or closing procedure, which results in the power supply to the motor
being switched off.
Thermal Protection
The thermal protection of the slide/tilt sunroof motor is calculated in the FZD. For this
purpose there is a temperature sensor on the pc-board of the FZD which determines the
ambient temperature.
The FZD calculates the current motor temperature based on the operating time of the
sunroof motor. The warm-up and cool-down phases are stored based on a temperature
model in the FZD. The current temperature is entered in the memory before the FZD
assumes sleep mode. When the vehicle is restarted, the motor temperature is adjusted
to the ambient temperature.
Panic Mode
The slide/tilt sunroof is closed at maximum closing force in panic mode. Panic mode can
be activated up to a vehicle speed of 16 km/h. Panic mode is triggered by pressing,
releasing, again pressing and holding the sunroof button.
The anti-trapping function is not active.
Terminal 58g
When the exterior lights are switched on, the FRM sends this information via the K-CAN.
The FZD receives this information and adopts the set value for the instrument lighting.
The LED in the button for the slide/tilt sunroof is activated, pulse width-modulated by the
FZD. This achieves a constant brightness of the LED even under fluctuating system volt-
age conditions.
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