GM Service Manual Online
For 1990-2009 cars only

IP Cigar Lighter

Battery positive voltage (B+) is applied at all times through the rear fuse block C/LTR fuse to the cigar lighter on CKT 1840. When the cigar lighter is pressed in, the cigar lighter heating element is provided a ground path through CKT 450 and heats up. When the heating element reaches a predetermined value, the cigar lighter will pop out, thus interrupting the circuit.

Rear Door Cigar Lighters

Battery positive voltage (B+) is applied at all times through the rear fuse block C/LTRR fuse (RH Rear Door Cigar Lighter) and the C/LTRL fuse (LH Rear Door Cigar Lighter) )to the cigar lighters on CKT 240 (LH) and 1740 (RH). When the cigar lighter is pressed in, the cigar lighter heating element is provided a ground path through CKT 550 (LH) and CKT 650 (RH) and heats up. When the heating element reaches a predetermined value, the cigar lighter will pop out, thus interrupting the circuit.

Cigar Lighters (With DO7 or WO1)

Battery positive voltage (B+) is applied at all times through the rear fuse block AUXOTLT fuse to the cigar lighter and the rear cigar lighter on CKT 2340. When the cigar lighter is pressed in, the cigar lighter heating element is provided a ground path through CKT 450 to ground G201 and heats up. When the heating element reaches a predetermined value, the cigar lighter will pop out, thus interrupting the circuit.

Accessory Power Receptacle (Without DO7 or WO1)

Battery postive voltage (B+) is applied through the rear fuse block AUXOTLT fuse to the accessory power outlet on CKT 2340. When an accessory is plugged in, it completes the ground path through CKT 450 (BLK) to ground G201.