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Home >> Land Rover >> 2012 >> LR4 HSE Lux >> Repair and Diagnosis (Single Page) >> Body & Frame >> Sun Roof/T-Top/Convertible Top >> Roof Opening Panel >> Roof Opening Panel >> Description & Operation >> Roof Opening Panel >> Operation >> Notes

Roof Opening Panel: Operation: Notes

The sunroof can be operated with the ignition in power modes 4 accessory or 6 on. The sunroof can also be operated for up to 40 seconds after the ignition power mode 0 'off' provided the driver's or passenger's door is not opened. During the 40 second period the one touch function is inoperative.

The motor contains a micro-switch and a Hall effect sensor. Two gears, driven by the motor at one end of the pinion drive spindle, trip the micro-switch every thirteen revolutions of the spindle. When the micro-switch is tripped, the sunroof control module senses an open circuit signal. The sunroof control module, to calculate the exact position of the sunroof, uses the signal from the micro-switch combined with signals received from the Hall effect sensor. The Hall effect sensor is also responsible for the operation of the anti-trap function.

If the anti-trap feature is activated while the sunroof is closing, the roof panel is reversed for 200mm or as far as possible. The Hall sensor, located in the sunroof motor, monitors the speed of the motor and if the speed decreases below a set threshold, indicating an obstruction, the power feed to the motor is reversed so the sunroof goes back. In an emergency the anti-trap function can be overridden by holding the sunroof switch in the closed position.