Sunroof / Moonroof: Description and Operation

Moonroof

How the Circuit Works

The moonroof is controlled by the moonroof control unit, the moonroof switch, the power window master switch, and the MICU. The moonroof control unit contains the moonroof close relay, moonroof open relay, moonroof motor, the hall sensor, and the CPU.

Normal Operation
Battery voltage is supplied at all times through fuse 28 (in the under-dash fuse/relay box) to the contacts of the moonroof open and close relays. With the ignition switch in ON (II) or START (III), battery voltage is supplied through fuse 21 (in the under-dash fuse/relay box) to the MICU. The MICU provides battery voltage to the moonroof control unit and moonroof switch. The CPU uses input from the moonroof switch to provide ground for the relays. When one of the relays is energized, battery voltage is provided to the moonroof motor. In this condition, the other relay provides a path to ground for the moonroof motor. The CPU and relays are grounded at G501.

The moonroof has a key-off delay, which allows the moonroof to be operated for up to 10 minutes after the ignition is turned off. Opening one of the front doors cancels the key-off delay.

Remote Transmitter Operation
The moonroof can be opened with the remote transmitter. By pressing the UNLOCK button twice and then holding it, the moonroof and all four windows will open. The moonroof and windows cannot be closed with the remote transmitter.

Ignition Key Operation
The moonroof can be opened and closed with the ignition key. By inserting the key into the driver's door key cylinder switch and turning the key clockwise twice and then holding it, the moonroof and all four windows will open. By inserting the key into the driver's door key cylinder switch and turning the key counterclockwise twice and then holding it, the moonroof and all four windows will close.