Lighting and Horns: Description and Operation

GENERAL INFORMATION
Each vehicle is equipped with various lamp assemblies. A good ground is necessary for proper lighting operation. Grounding is provided by the lamp socket when it comes in contact with the metal body, or through a separate ground wire.

When changing lamp bulbs check the socket for corrosion. If corrosion is present, clean it with a wire brush and coat the inside of the socket lightly with Mopar Multi-Purpose Grease or equivalent.

Daytime Running Lamps
The daytime running lamps are controlled by the Daytime Running Lamp Relay (DRLR). The DRLR is located in the engine compartment on the left fender wheelhouse. The DRLR allows the high beam headlamps to illuminate at 50 % of the switched ON brightness when the engine is running with the headlamp switch OFF The Daytime running lamps will go out when the headlamp switch is pulled out. The passing light feature will flash bright high beams while the daytime running lamps are activated.

INTERIOR LIGHTING
Introduction
Circuit M1 supplies power to the underhood lamp, glove box lamp, dome lamp, buzzer module, cargo lamps, vanity lamps and the time delay relay Circuit M50 from the time delay relay powers the ignition switch lamp.

Circuit M1 is protected by the Ignition Off Draw (IOD) fuse in the fuse block, cavity 17. This fuse is a 15 amp.

Power for the M1 fuse is supplied on circuit A7. This circuit originates in the Power Distribution Center (PDC) and is protected by a 50 amp fuse located in cavity 1.

CIRCUIT OPERATION
Lamps
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 and map lamps. Circuit M2 provides ground for the dome lamp.

The M2 circuit supplies ground for the overhead console dome 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.