Description
Roof Opening Panel
NOTE:
A = Hardwired; O = LIN Bus
Roof Opening Panel - Control Diagram
Roof Opening Panel Operation
The sliding glass panel and roller blinds are controlled by the switch pack in the front overhead console. The rear roller blind can also be controlled by a button in the rear overhead console. The rear overhead switch function can be isolated by isolating the rear electric windows on the drivers window switch pack.
Roof Opening Panel
A rocker switch in the front overhead console controls the opening and closing of the sliding glass panel with a one-touch function in the direction required:
- Press (3) once to tilt the panel.
- Once tilted, press (3) again to open the panel.
- Press (3) to close the panel from tilt.
- From the fully open position, press (3) once to close to the tilt position, then press again to close fully.
- Sliding glass panel movement can be halted at any time by pressing the button (3) again.
Anti-trap mechanism
If the roof panel encounters resistance when closing it will stop, and then open a set distance in the opposite direction. This is to prevent serious injury or damage to the mechanism. The anti-trap mechanism can be overridden to allow the roof to be closed when movement is restricted by dirt. To override the anti-trap mechanism, press and hold the front of the switch until the roof reaches the closed position.
Roof Blinds
CAUTION: To prevent damage to the roof blind mechanism the blinds must not be operated manually.
Front blind
One push of the button (5) will fully open or close the blind. The blind is either fully open or closed and cannot be halted part way.
The front blind opens automatically as the roof panel is opened, preventing wind affecting the blind. The blind cannot be closed when the roof is open.
Rear blind
One push of the buttons (4) or (6) will fully open or close the blind. The blind is either fully open or closed and cannot be halted part way.
Pressing the dual purpose isolator switch (2) in the driver's door switch pack (1) will inhibit the rear passenger's operating the rear windows and roof panel rear-blind.
NOTE:
Global open/close functionality is not enabled on the roof module.
The front half of the roof opening panel components are common for both long and short wheel Gasoline Systems, although the frames are unique to each type of vehicle. The steel frame forms a structural contribution to the vehicle body, helping maintain the rigidity of the shell even with the majority of the aluminum roof removed.
Glass Panels
The glass section of the roof begins at the top edge of the windscreen and extends back to a line mid-way between the 'B' and 'C' pillars. The external surface of the roof opening panel comprises the following three glass elements:
- Fixed front glass panel (5mm thick)
- Sliding glass panel (4mm thick)
- Fixed rear glass panel (4mm thick)
All three panels are manufactured in a tinted toughened glass with a Protec safety film bonded onto the lower surface to prevent shards of glass entering the vehicle cabin in the event of a breakage.
The tinted glass provides a high degree of solar protection allowing only 8.2 percent heat transmission into the vehicle. The fixed front panel fills the space between the windscreen and the sliding center panel. The fixed rear panel above the rear passenger compartment sits between the rear of the sliding panel and the rear section of the aluminum roof.
A wider rear glass panel accommodates the 125mm difference in roof length between standard and long wheel Gasoline Systems.
The sliding glass panel features an electrically powered tilt and slide mechanism. On opening, the rear of the panel tilts upwards before moving rearwards above the fixed glass panel. As the sliding panel opens a wind deflector rises automatically across the leading edge of the aperture. The deflector manufactured from a mesh type material is used to reduce wind-noise.
Roof Opening Panel Components - Interior View
The roof opening panel assembly features electrically powered front and rear roller blinds that can be independently operated. Guided by side rails, each blind rolls to-and-from the center of the roof opening panel with the:
- front blind closing forwards, and the
- rear blind closing rearwards.
Control Module and Motor
The opening and closing function of the sliding glass panel and roller-blinds are controlled by the roof module which is integral with the sliding glass panel motor. The module receives a permanent battery power supply from the RJB (rear junction box).
To open or close the sliding glass panel and blinds the module receives hardwired 'open/close' inputs from the switches located in the front and rear overhead console panels.
The control module has a non-volatile memory, if battery power to the module is lost the sliding roof panel and blind positions are retained and the one-touch feature does not require re-initializing. However due to the software condition if the battery power to the control module is interrupted when the ignition is switched on, the one-touch feature must be re-initialized.
Once the power supply is restored, reset the roof mechanism as follows:
- Switch the ignition on.
- Fully close the roof.
- Press the front of the roof switch, and hold for 45 seconds.
- After 45 seconds the roof will begin to move. Keep the front of the switch pressed until the roof and the roof blinds have fully opened, then closed.
- Once the open/close cycle has completed and the roof has stopped moving, release the switch.
- The roof can now be operated as normal.
The motor that operates the sliding glass panel uses a drive gear which engages and drives two cables within a sleeved tube. Each cable is linked to the sliding glass panel's open and close mechanism located either side of the panel. The rotation of the motor drives the cables in the required direction. Signals from a Hall effect sensor located in the motor enables the control module to calculate the exact position and operating speed of the glass sliding panel.
The Hall effect sensor is also an operational component of the anti-trap function. The control module uses the operating speed of the sliding glass panel and the current draw of the motor to detect an obstruction. If the sliding glass panel closing speed decreases below a set threshold and the current draw from the motor increases the power feed to the motor is reversed. This will then open the sliding glass panel a set distance in the opposite direction of travel. In an emergency the anti-trap function can be overridden by holding the operating switch in the close position.
Depending on vehicle speed the closing threshold of the anti-trap function is adjusted to counteract the force of air pressure acting upon the sliding roof panel. Vehicle speed signal is transmitted from the ABS module via the high-speed CAN bus to the CJB (central junction box) where the signal is processed and transmitted over a LIN bus connection to the roof module. As vehicle speed increases, air pressure forces acting upon the sliding panel simultaneously increase, affecting the anti-trap functionality. The vehicle speed signal is used by the control module to re-calibrate the anti-trap algorithm, accounting for the extra force acting on the sliding panel. This function adapts the sliding panel closing speed threshold of the anti-trap function, dependant on vehicle speed.
Both the sliding glass panel and front blind motors have a thermal protection device built into the control module software to protect them from overheating. The operating parameters are as follows:
- If the motor temperature is between 60 and 77 degrees C the roof operation is restricted to a close only function.
- If the motor temperature exceeds 77 degrees C during the closing function the movement will not be interrupted.
- If the motor temperature exceeds 77 degrees C when the roof is closed movement will be inhibited.
- If the anti-trap function is operational when closing, the reverse movement of the motor will complete its movement regardless of motor temperature.
Thermal protection for the sliding glass panel motor and front blind motor are functioned in unison, therefore if one motor exceeds 60 or 77 degrees C the same restrictions, as defined above, will apply to both motors. For example if the front blind cannot be opened due to thermal protection the sliding glass panel will also ignore the opening command.