2500 4x4 Pickup V8-318 5.2L Magnum (1995)
Map Lamp: Description and Operation
Circuit M1 supplies voltage for the reading lamps, map lamp and dome lamp in the overhead console. The Ignition Off Draw (IOD) fuse (fuse 17) in the
fuse block supplies voltage to circuit M1. Circuit A7 from fuse 1 in Power Distribution Center (PDC) feeds the IOD fuse.
Circuit Z4 grounds the reading lamps. Circuit M2 also provides ground for the reading lamps and dome lamp.
The M2 circuit supplies ground for the overhead console lamp in two ways. One way is through the door jamb switches. Circuit M2 connects to the door
jamb switches. The door jamb switches connect to ground on circuit Z3. When a door is OPENED, the plunger in the switch CLOSES, completing a
path to ground.
The second ground path is through the headlamp switch. When the operator turns the headlamp switch to the dome lamp ON position, a ground path
provided on circuit M2 through the switch to ground on circuit Z3.
