Sunroof / Moonroof: Description and Operation

The sunroof is operated by means of a two-position switch, and can be opened in two ways:
^ The sunroof can be opened fully or partially by running it rearwards.
^ The rear of the sunroof can be raised.

The sunroof is supplied with current via fuse 9 which supplies switch 386 (ROOF) with current.

Opening The Sunroof
The sunroof is opened rearwards by pressing switch 386 (ROOF) so that current is supplied from terminal 3 to terminal BK of motor 182.

Current is then supplied to a microswitch, which is controlled by motor 182's cam, to the actuating coil of stepping relay 232 and back to ground via terminal 4 of switch 386 (ROOF).

When the relay operates, the motor's other terminal BU is grounded. The motor moves the sunroof rearwards. At the same time, the cam actuates the microswitch so that the supply of current to the stepping relay's coil is broken but the relay's contacts remain closed so that the motor is grounded as long as the switch remains activated.

If the switch is held depressed until the sunroof is completely open, the microswitch will return to the rest position. The coil in the relay once again receives current and the relay contacts return to their original position. The ground connection is broken and the motor stops.

The motor is equipped with an overload cut-out which trips if the sunroof is prevented from moving for some reason or other.

Closing The Sunroof
The sunroof is closed by pressing switch 386 (ROOF). This causes current to be supplied via terminal 4 to terminal BU of the motor.

Motor terminal BK is grounded via the switch.

The motor moves the sunroof forwards. At the same time the cam actuates the microswitch so that the stepping relay coil's connection to ground is broken but the relay's contacts remain closed so that the motor continues to be supplied with positive current as long as the switch is activated.

If the switch is held depressed until the sunroof is completely closed, the cam actuates the microswitch so that it returns to its rest position. The coil in the relay is grounded and the relay contact breaks the supply of current so that the motor stops.

Raising And Lowering The Rear Of The Sunroof
Before the rear of the sunroof can be raised, the sunroof must be completely closed.

When switch 386 (ROOF) is pressed to the closing position, the rear of the sunroof lifts. The function is the same as for closing the sunroof, when it moves forward.

When the rear of the sunroof is raised, it can be lowered by moving the switch to the opening position. The function is the same as for opening the sunroof, when it moves rearward.