Battery positive voltage (B+) is applied at all times through the IP fuse block C/LTR fuse to the cigar lighter on CKT 1640 (Buick), or CKT 1040 (Oldsmobile). When the cigar lighter is pressed in, the cigar lighter heating element is provided a ground path through CKT 150 (Buick), or CKT 1050 (Oldsmobile). This heats up the heating element. When the heating element reaches a predetermined value, the cigar lighter will pop out, thus interrupting the circuit. There is also a rear cigar lighter (Oldsmobile) located in the rear of the vehicle.

Battery positive voltage (B+) is applied through the IP fuse block AUX PWR fuse to the auxiliary power outlet on CKT 1241. When an accessory is plugged in, B+ completes the ground path through CKT 150 (BLK).

Battery positive voltage (B+) is applied through the IP fuse block AUX PWR fuse to the auxiliary power outlet on CKT 1241. When an accessory is plugged in, B+ completes the ground path through CKT 1050 (BLK).