Sunroof / Moonroof: Description and Operation

System Description
The outer sliding sunroof system consists of the sunroof switch, the sunroof relay, and the sunroof motor.

System Operation
1. Tilt-up
When the sunroof is closed, the sunroof motor limit switch is in the close position. When the sunroof switch is moved to the open/tilt-up position, voltage is applied to the sunroof motor and to the sunroof relay coil through the diode bridge. The relay coil is grounded through the limit switch, the diode bridge, and the close switch contact in the sunroof switch. The sunroof motor operates because it is grounded through the sunroof relay contact and the close switch contact in the sunroof switch. When the limit switch reaches the open position, the sunroof relay ground path is interrupted, de-energizing the relay and momentarily stopping the motor.

2. Slide open
With the sunroof switch in the open position, voltage is applied to the sunroof motor and the sunroof relay coil through the diode bridge. The relay energizes since its coil is grounded through the transistor, the diode bridge, and the close switch contact in the sunroof switch. The sunroof motor runs since it is grounded through the relay contact and the close switch contact.

3. Slide close
With the sunroof open, the sunroof motor limit switch is in the open position. When the sunroof switch is moved to the close position, voltage is applied to the sunroof relay coil through the diode bridge. The sunroof relay coil is grounded through the transistor, the diode bridge, and the open/tilt switch contact in the sunroof switch. The sunroof relay energizes and the relay contact closes to allow voltage to be applied to the sunroof motor. The motor runs since it is grounded through the open/tilt switch contact in the sunroof switch.