Dome Lamp: Description and Operation
Cargo Lamp, Courtesy Lamps and Dome LampCIRCUIT OPERATION
Circuit M1 from the Ignition Off Draw (IOD) fuse in cavity 16 of the Power Distribution Center (PDC) supplies power to the cargo lamp, courtesy lamps and dome lamp. This circuit is HOT at all times. The ground path for the lamp is provided in three different ways.
One way is through the door jamb switches. Circuit M2 connects to the door jamb switches from the courtesy and dome lamps. The switches are connected to ground circuit Z1. When a door is opened, the plunger in the switch CLOSES, completing a path to ground.
The second way is through the liftgate switch. Circuit M2 connects to circuit M4 through the liftgate switch. The liftgate switch connects to ground circuit Z1. When the lift gate opens, the plunger in the switch CLOSES, completing a path to ground.
The third ground path is through the headlamp switch. Circuit M2 is spliced in with the headlamp switch. When the operator turns the headlamp switch to the dome lamp ON position, a ground path is provided through the switch.