Operating principles (Freelander 2)

The sunroof panel only operates when the vehicle is in power mode 6 (ignition). Power to the sunroof panel control module/motor is supplied by the CJB, which supplies both constant power from the battery and power from the ignition. The CJB provides a vehicle speed signal to the control module.

For more detailed information on the operation of the sunroof panel, refer to the "Operation Manual".

Switch input signals

The sunroof panel rocker switch is mounted on the roof console and is connected to the control unit by two signal power lines. When the switch is in the home (center) position, both connections to the control unit are open. When the switch is pressed to open the glass panel, the signal power line from pin 4 of the electrical connector of the control unit creates a ground connection through the switch contacts. When the switch is pressed to close the glass panel, the switch grounds the signal power line from pin 8 of the electrical connector of the control unit.

When a request is received to raise the sunroof to the tilt position, the switch connects the power supply signal line from pin 8 of the control unit electrical connector to ground, as described in the closing operation.

Preventing pinching

The sunroof panel motor is calibrated to detect a blockage preventing the glass panel from closing. The force required to close the glass panel when the vehicle is stationary does not exceed approx. 100 N. When this limit is reached, the control unit switches the motor in the opposite direction to move the glass panel by 200 mm.



The control unit also monitors external forces that may increase the force required to close the glass panel. In determining this value, the control unit bases this on vehicle speed, poor road conditions and excessive outside air temperature. If necessary, the control unit can increase the maximum force applied by the electric motor to approximately 150 N.

Vehicle speed signal

The vehicle speed signal is used by the sunroof panel control unit to adjust the sensitivity of the anti-pinch function. This signal allows the control unit to take into account wind resistance when closing the sunroof panel when the vehicle is traveling at speeds above 4 km/h (mph).

The vehicle speed signal is generated by the ABS module and transmitted via the high-speed CAN bus. The CJB converts the vehicle speed signal into a pulsed voltage signal and transmits it to the control module. This signal pulses at a rate of 5,000 pulses per kilometre (8,000 pulses per mile) and has a duty cycle of 50% on, 50% off.

Calibration

If the battery is disconnected or the power supply is interrupted while the sunroof is partially open, the sunroof must be recalibrated.

After connecting the battery or restoring the power supply, calibrate the sunroof as follows:

• Turn on the ignition.
• With the sunroof closed, press and release the front of the switch. The sunroof will move to the tilted position for calibration.
• Press the front of the sunroof switch and hold for twenty seconds.
• After twenty seconds, the sunroof will begin to move. Keep the front of the switch pressed until the sunroof is fully open and then closed.
• Once the opening/closing cycle is complete and the sunroof stops, release the switch.

Now the hatch can operate normally.