Description and operation (Sunroof Operation): Description and operation (page 2 of 6)

Front sunroof - close function When the front sunroof switch is set to the close position, an earth path from pin C0785-7 of the sunroof ECU to the front sunroof switch is completed on a GR wire. The front sunroof switch is earthed via splice joints A14 and A15 to earth header C0018 on a B wire. The sunroof ECU logic circuit monitors a current flow from pin C0785-7. With this current flow forming a ’close’ input the sunroof ECU logic supplies a power feed to pin C0785-1.

The feed flows from pin C0785-1 of the sunroof ECU to the sunroof motor on a W wire. The front sunroof motor is earthed on a B wire via splice joints A14 and A15 to earth header C0018. The sunroof motor drives the sunroof mechanism towards the close position.

When the sunroof switch is released, the earth path via the sunroof switch is interrupted and the close input to the sunroof ECU will be lost. The sunroof ECU logic circuits remove the power supply to pin C0785-1, this removes the power supply from the sunroof motor.

Rear sunroof operation

Rear sunroof tilt detection The rear sunroof motor is connected to pin C0784-1 on the sunroof ECU by a OG wire. An input to the sunroof ECU via this connection forms a sunroof tilt input to the sunroof ECU.