Sunroof / Moonroof: Description and Operation
MoonroofHow the Circuit Works
The moonroof is controlled by the moonroof control unit, moonroof switch, and MICU. The moon roof control unit contains the moon roof close relay, moonroof open relay, moonroof motor, the hall sensor, and the CPU.
System Operation
Fuse 24 (in the under-dash fuse/relay box) supplies battery voltage at all times to the coils and contacts of the moon roof open and close relays. The energized power window relay supplies battery voltage to the moonroof control unit CPU and moonroof switch.
The CPU uses input from the moonroof switch to energize the relays. Energizing one of the relays supplies battery voltage 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 operate for up to 10 minutes after the ignition is turned off. Opening one of the front doors cancels the key-off delay.