GM Service Manual Online
For 1990-2009 cars only

Fuel Door Lock

When the RIM receive a class 2 message from the DDM it supplies ground for the coil side of the fuel door lock relay. The coil side of the relay receives B+ through the 10 A ALDL fuse. When the relay is energized is closed the switch in the relay supplying power the fuel door lock solenoid from the 15 A body fuse. Ground for the fuel door lock solenoid is supplied through the fuel door unlock relay (when it is not energized) and G302.

Fuel Door Unlock

When the RIM receive a class 2 message from the DDM it supplies ground for the coil side of the fuel door unlock relay. The coil side of the relay receives B+ through the 10 A ALDL fuse. When the relay is energized is closed the switch in the relay supplying power the fuel door lock solenoid from the 15 A body fuse. Ground for the fuel door lock solenoid is supplied through the fuel door lock relay (when it is not energized) and G302.