When the headlamp switch is moved to the PARK or HEAD position, battery voltage is applied to the underhood electrical center through CKT 9. Battery voltage passes from the underhood electrical center to both of the license lamps, both of the tail lamps, all the park lamps, and all of the side markers through CKT 9. Export vehicles will use in-line fuses to protect these circuits, one for the right side and one for the left side. Both license lamps, both of the tail lamps, all park lamps, and all side markers are grounded by circuit 150 through Splice Packs #102, #400, or #402 to ground.

Battery voltage is applied at all times to the stoplamp switch from the ST P/HAZ MiniFuse® #8 through CKT 140. When the Stoplamp Switch is closed, battery voltage is applied to the underhood electrical center through CKT 20. The underhood electrical center then distributes battery voltage to all stop lamps through CKT 820. All stop lamps are grounded by CKT 150 through Splice Packs #400 or #402 to G401.

When the ignition switch is moved to the ON or START position, battery voltage is applied to the ELEC flasher from the HAZ T/SG MiniFuse® #15 through CKT 1739. This battery voltage is then applied from the ELEC flasher to the turn signal switch through CKT 16.

During a right or left turn signal command, battery voltage is supplied from the turn signal switch to the instrument panel electrical center and the BCM using CKT 15 for the front RH turn signal or CKT 14 for the front LH turn signal. Within the instrument panel electrical center there are two micro relays (DRL R Micro Relay #38 and DRL L Micro Relay #40) which are used to determine whether the front turn signals or the front Daytime Running Lamps (DRL) are in operation. During normal driving, the BCM will ground CKT 1914 and CKT 1915 which will activate the two DRL relays and illuminate the front DRL lamps. During a turn signal request, the BCM will remove the grounds from CKT 1914 and CKT 1915 which then allows battery voltage to pass through the DRL Micro Relays and illuminate the front RH turn lamp through CKT 1315 or the front LH turn lamp through CKT 1314.

The rear turn signal lamps are directly controlled by the turn signal switch unlike the front turn signal lamps. During a right or left turn signal command, battery voltage is applied to the rear RH turn signal lamp through CKT 19 or the rear LH turn signal lamp through CKT 18. All turn signal lamps are grounded through CKT 150. Domestic/Canadian vehicles ground the front lamps by CKT 150 through Splice Pack #102 to G102. Export vehicles will ground the front lamps by CKT 150 through Splice Packs #100 and #101 to G102 or G101. All vehicles will ground the rear turn signal lamps by CKT 150 through Splice Packs #402 and #400 to G401.