Rear Sunroof Operation - Via Front Switch 1

Rear sunroof - open function - via front switch 1
When the rear 1 sunroof switch is set to the open position, an earth path from pin C0784-7 of the sunroof ECU to the to sunroof switch is completed on a GU wire. From sunroof switch 1 the earth continues via splice joints A14 and A15 to earth header C0018 on a B wire. The sunroof ECU logic circuit monitors the current flow from pin C0784-7. With this current flow forming an 'open' input the sunroof ECU logic supplies a power feed to pin C0785-4.

The feed flows from pin C0785-4 of the sunroof ECU to the rear sunroof motor on an OU wire. The rear 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 open position.

When the sunroof switch is released, the earth path via the sunroof switch is interrupted and the open input to the sunroof ECU will be lost. The sunroof ECU logic circuits remove the power supply to pin C0784-4, this removes the power supply from the sunroof motor.

Rear Sunroof - Close Function - Via Front Switch 1
When the rear sunroof switch 1 is set to the close position, an earth path from pin C0785-8 on the sunroof ECU to the rear sunroof switch 1 is connected on a GO wire. The rear sunroof switch 1 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 C0785-8. With a current flow forming an 'close' input 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 rear sunroof motors are 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 00785-6, this removes the power supply from the sunroof motor.