501-17 Roof Opening Panel: Description And Operation (page 4 of 6)

 
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OPERATION 

The sunroof can be operated with the ignition switch in position I or II. The sunroof can also be operated for up to 40 
seconds after the ignition is switched 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. 
 

Tilt 

With the sunroof panel closed, pushing the upper part of the rocker switch operates the sunroof motor to 'tilt' the rear of 
the sunroof upwards. The motor operates for as long as the switch is operated until the glass is tilted to its full extent. If 
the switch is released before the full tilt position is reached, the sunroof panel stops at the chosen position. A single press 
(between 0.5 and 1 second) of the switch operates the motor so that the panel automatically retracts to the fully tilted 
position. 
 
When the tilt function is requested, the cables pull the guide rearward, forcing the panel attachment up a curve, which 
raises the sunroof panel to the tilt position. 
 
With the sunroof panel in the tilted position, pushing the lower part of the rocker switch operates the sunroof motor to 
lower the sunroof panel. The motor operates to lower the panel for as long as the switch is operated until the panel is fully 
lowered. If the switch is released before the fully lowered position is reached, the sunroof panel stops at the chosen 
position. 
 

6  Emergency (see note below) 

Input 

7 

ECU Ground 

- 

8 

Battery 

Input 

9 

Not used 

- 

10 

Not used 

- 

11 

Not used 

- 

12 

LIN 

Input 

Pin 6 is for use in an emergency only in the event of the vehicle LIN bus not being functional. It is not connected on 
the vehicle harness or in the connector. 

Putting pin 6 to ground will enable the sunroof control module but without one touch operation or anti trap. The 
sunroof will not require re-calibrating unless the battery has been disconnected. 

The sunroof control module will remain awake and enabled until pin 6 is disconnected again. Under no 
circumstances is this pin to be left grounded for long periods. 

There is no emergency key access in the headlining for manual sunroof operation should the motor fail for any 
reason.