Lighting and Horns: Description and Operation

GENERAL INFORMATION
JX vehicles use lighting on the interior and exterior of the vehicle for illuminating and indicating purposes. Lighting circuits are protected by fuses or circuit breakers. Lighting circuits require an overload protected power source, on/off device, lamps and body ground to operate properly. Plastic lamps require a wire in the harness to supply body ground to the lamp socket. Lamp sockets that are exposed to moisture should be coated with Mopar� Multi-purpose Grease, or equivalent, to avoid corrosion. If a socket has become corroded, clean socket and bulb base with abrasive fiber sanding pad or metallic bristle brush. Replace sockets and bulbs that are deformed from corrosion that could prevent continuous body ground.

Wire connectors can make intermittent contact or become corroded. Before coupling wire connectors, inspect the terminals inside the connector. Male terminals should not be bent or disengaged from the insulator. Female terminals should not be sprung open or disengaged from the insulator. Bent and sprung terminals can be repaired using needle nose pliers and pick tool. Corroded terminals appear chalky or green. Corroded terminals should be replaced to avoid recurrence of the problem symptoms. Wire connector terminals should be coated with Mopar� Multi-purpose Grease, or equivalent, to avoid corrosion.

Begin electrical system failure diagnosis by testing related fuses and circuit breakers in the fuse block and engine compartment. Verify that bulbs are in good condition and test continuity of the circuit ground.

INTRODUCTION
Front Lighting
The headlamp switch has three positions, OFF, PARK (parking lamps), and ON. Power for the headlamp portion of the headlamp switch is provided on circuit A3. This circuit originates in the Power Distribution Center (PDC) and is protected by a 40 Amp fuse located in cavity 15. The headlamp switch has a LOW beam and HIGH beam select position.

Power for the parking lamp portion of the headlamp switch is provided on circuit F33. Circuit A13 in the Power Distribution Center (PDC) powers a 20 Amp fuse located in cavity 7 of the junction block. The A13 circuit is protected by a 40 Amp fuse located in cavity 12 of the PDC. Circuit F33, which connects to the other side of the fuse in the junction block, connects to the headlamp switch and is spliced to provide power for the instrument cluster.

Interior Lighting
The interior lamps system is powered at all times by the 10 Amp fuse located in cavity 5 of the junction block. This is the Ignition-Off Draw (IOD) fuse. Circuit M1 is connected from the fuse to the trunk lamp, vanity lamps, dome lamp, and overhead lamps.

Power for the fuse is supplied on circuit A7 from the Power Distribution Center (PDC). The A7 circuit is protected by a 20 Amp fuse located in cavity 4 of the PDC.

SYSTEM OPERATION
Exterior Lamps
To turn lamps ON:
- Parking lamps, using left stalk turn headlamp switch to the first detent
- Headlamps, turn switch to second detent
- Headlamp beam select, from low beam to high beam or high to low, pull left stalk towards steering wheel. The ignition switch must be in the RUN position for the instrument panel high beam indicator to light.
- Headlamp optical horn, pull left stalk towards steering wheel, headlamps will stay ON as long as stalk is held.
- Fog lamps, pull switch outward with headlamps on low beam
- Panel dimmer, rotating dimmer switch regulates density of the instrument panel illumination. There are nine detentes (steps) of density Detent 1 is full brightness and each detent thereafter is lower. Testing the dimmer switch using the continuity test, the resistance value is measured for each detent. Detents 3 through 8 are measured in equal graduations, up or down and referred to as linear. Example: if detent 3 was 5 Ohms and detent 4 was 7 Ohms detent 5 should be 9 Ohms.

Daytime Running Lamp Module:

Daytime Running Lamp (CANADA)
JX vehicles built for use in Canada are equipped with a Daytime Running Lamp (DRL) system. The DRL system operates the headlamps at 50% illumination with the headlamp switch OFF, park brake released and the ignition ON. The DRL system is controlled by the Daytime Running Lamp Module located on the back of the multi-function module behind the instrument panel. The DRL module overrides the headlamp switch when the head-lamps are turned OFF. The headlamps operate normally when the headlamps are turned ON.

Headlamp Time Delay System
The optional Headlamp Time Delay system is controlled by the Body Controller (BC) and a relay located in the junction block. The headlamp time delay system can be activated by turning ON the headlamps when the engine is running, turn OFF the ignition switch, then turn OFF the headlamp switch. The BC will allow the headlamps to remain ON for 90 seconds before they automatically turn off.