Rear Sunroof Operation - Via Rear Switch 2

Rear sunroof switch 2 - isolation
An isolation switch is connected by an BS wire to the rear sunroof switch 2. From the isolation switch a B wire is connected to earth via splice joints A14 and A15 to earth header C0018. When the isolation switch is pressed the earth line from the rear sunroof switch 2 is interrupted. This function allows the driver or front seat passenger to disable the rear sun roof switch 2.

Rear sunroof switch 2 - normal operation

Rear sunroof open function - via switch 2
When the rear 2 sunroof switch is set to the open position, an earth path from pin 00784-6 on a GW wire is completed via the closed contacts of the isolation switch, and on a B wire via splice joints A14 and A15 to earth header C0018. The sunroof ECU logic circuit monitors the current flow from pin 00784-6. With this current flow forming an 'open' input the sunroof ECU logic supplies a power feed to pin 00785-4.

The feed flows from pin 00785-4 on an CU wire to the rear sunroof motor. The rear sunroof motor is earthed on a B wire via splice joints A14 and A1 5 to earth header Cool 8. The sunroof motor drives the sunroof mechanism towards the open position.

When the sunroof switch is released, the earth path via the sunroof and
isolation switches is interrupted. The open input to the sunroof ECU will be lost and the sunroof ECU logic circuits remove the power feed to pin 00784-4, this removes the power supply from the sunroof motor.

Rear Sunroof - Close Function - Via Front Switch 2
When the rear sun root switch 2 is set to the close position, an earth path from pin C0784-9 on a GB wire is completed via the closed contacts of the isolation switch, and on a B wire via splice joints A14 and A15 to earth header C0018. The sunroof ECU logic circuit monitors the current flow from pin C0784-9, this current flow forms a 'close' input and the sunroof ECU logic supplies a power feed to pin C0785-6.

The feed flows from pin C0785-6 on a O wire to the rear sunroof motor. The sunroof motor drives the sunroof mechanism towards the close position. When the sunroof switch 2 is released, the earth path via the sunroof switch is interrupted. The close input to the sunroof ECU is lost and the sunroof ECU logic circuits remove the power supply to pin C0785-6. This removes the power supply from the rear sunroof motor.

Sunroof Motor Protection
Control functions of the sunroof ECU prevent damage to the sunroof motors at full travel positions when the operating switch is still pressed:
^ Current (step) sensing
^ A backup seven second time delay after movement has stopped.


NOTE: Either of these control functions will stop the operation of the sunroof motors at the end of travel positions.