GM Service Manual Online
For 1990-2009 cars only

When a cigar lighter is pressed in, the cigar lighter heating element is provided a ground path and heats up. When the heating element reaches a predetermined value, the cigar lighter will pop out, thus interrupting the circuit. Voltage is supplied at all times to the cigar lighter on CKT 640 (ORN) from the cigar fuse. Ground is provided on circuit 1850 (BLK).

The auxiliary outlet becomes active when an electrical accessory is plugged into the outlet. Voltage is supplied at all times to the auxiliary outlet on CKT 1040 (ORN) from the auxiliary power fuse. Ground is supplied on CKT 1850 (BLK).