L322 Range Rover System Description and Operation
SUNROOF
DESCRIPTION AND OPERATION
76-6-5
Diagnosis
The sunroof control unit has a built in test function to allow self-checking and self-diagnosis.
The exchange of information with the diagnostic unit takes place through the basic module via the P-bus. It can be
used to identify three possible faults.
1 Mechanical stiffness (fault in the sunroof unit)
1 Implausible input signals (control fault)
2 Electronic fault.
Initialisation
Initialising the sunroof allows the control unit to learn the end positions of the motor's travel. The Hall sensors provide
pulses for motor rotation, the control module counts the pulses and determines where the panel is by memorizing the
stored pulses.
If the system is not initialised, the sunroof will only operate in the tilt up and slide close positions.
Initialisation Procedure
Press and hold the sunroof switch in the tilt position for 20 seconds, to tilt the sunroof fully open and begin initialisation.
After the 20 seconds, momentarily release the sunroof switch, then press and hold it in the tilt position again until the
sunroof has closed, then slid fully open and closed again (approximately 10 seconds).
