Front

CIRCUIT OPERATION
Power for the lamps is supplied in two different ways. One is a constant battery feed on circuit F41. This circuit is protected by a 15 amp fuse located in cavity 11 of the Power Distribution Center (PDC).

When the operator CLOSES the switch in the lamp, a ground path is completed through the lamp to ground on circuit M20 illuminating the lamp.

Circuit M2O connects from the lamps to the Body Control Module (BCM). The BCM supplies the ground path internally.

The second power source is supplied on circuit M113. This circuit is HOT when the contact side of the courtesy lamp relay is CLOSED, and the operator has moved the switch internal to the headlamp switch to the ON position.

Power for the coil and contacts sides of the courtesy lamp relay is supplied on circuit F41. This circuit is protected by a 15 amp fuse located in cavity 11 of the Power Distribution Center (PDC).

Ground for the coil side of the relay is controlled by the Body Control Module (BCM). The BCM determines the need for the relay to be activated based on inputs received from the door and liftgate switches.

Circuit G75 provides the input to the BCM from the left front door ajar switch, the switch is case grounded.

Circuit G74 provides the input to the BCM from the right front door ajar switch, the switch is case grounded.

Circuit G76 provides the input to the BCM from the right rear door ajar switch. Ground for the switch is supplied on circuit Z1 and terminates at the rear body ground.

Circuit G77 provides the input to the BCM from the left rear door ajar switch. Ground for the switch is supplied on circuit Z1 and terminates at the rear body ground.

Circuit G78 provides the input to the BCM from the liftgate ajar switch. Ground for the switch is supplied on circuit Z1, and terminates at the liftgate ground.

An additional input to the BCM is provided on circuit M112. This circuit connects from the headlamp switch to the BCM. It is used to supply a ground path for the coil side of the courtesy lamp relay when the operator has moved the courtesy lamp switch in the ON position.