Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics

Did you perform the Lighting System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

1. Turn the ignition to the ON position.
2. Turn the headlamp switch to the PARK position.
3. Press the fog lamp switch to the ON position.

Are the fog lamps ON?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

Is only one fog lamp inoperative?

Go to Step 4

Go to Step 6

1. Disconnect the inoperative fog lamp.
2. Probe the fog lamps supply voltage circuit of the inoperative fog lamp with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 17

Probe the ground circuit of the inoperative fog lamp with a test lamp that is connected to battery voltage.

Does the test lamp illuminate?

Go to Step 19

Go to Step 18

1. Place the headlamp switch in the HEAD position.
2. Place the headlamp switch in the high beam position.

Do the high beam headlamps operate properly?

Go to Step 7

Go to Headlamps Inoperative - High Beams

Check the FRT PARK, FOG LP fuse for an open.

Is the fuse open?

Go to Step 16

Go to Step 8

1. Disconnect the fog lamp relay.
2. Turn the ignition to the ON position.
3. Connect a test lamp between the switch side feed of the fog lamp relay and a good ground.

Does the test lamp illuminate?

Go to Step 9

Go to Step 22

1. Turn the headlamp switch to the PARK position.
2. Place the headlamp switch in the low beam position.
3. Connect a test lamp between the coil side feed of the fog lamp relay and a good ground.

Does the test lamp illuminate?

Go to Step 10

Go to Step 22

1. With the fog lamp switch in the ON position.
2. Connect a test lamp between the coil side feed and the control circuit of the fog lamp relay.

Does the test lamp illuminate?

Go to Step 12

Go to Step 11

1. Disconnect the fog lamp switch connector.
2. Connect a test lamp between the enable circuit of the fog lamp switch and battery voltage.

Does the test lamp illuminate?

Go to Step 13

Go to Step 14

Connect a fused jumper between the switch side feed and the supply voltage circuit of the fog lamp relay.

Do the fog lamps illuminate?

Go to Step 21

Go to Step 15

Test for an open, high resistance, or short to voltage in the control circuit of the fog lamp relay . Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 24

Go to Step 20

Test for an open, high resistance or short to voltage in the fog lamps enable circuit of the fog lamp switch . Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 24

Go to Step 23

Test for a open or high resistance in the fog lamp supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 24

Go to Step 22

Test for a short to ground in the fog lamp supply voltage circuit or the fog lamp indicator supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 24

Go to Step 22

Repair an open or a high resistance in the supply voltage circuit of the inoperative fog lamp . Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Has the repair been made?

Go to Step 24

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Repair an open or high resistance in the ground circuit of the inoperative fog lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Has the repair been made?

Go to Step 24

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Replace the inoperative fog lamp. Refer to Front Fog Lamp Bulb Replacement .

Has the repair been made?

Go to Step 24

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Replace the fog lamp switch. Refer to Instrument Panel Multifunction Switch Assembly Replacement in Instrument Panel, Gages, and Console.

Has the repair been made?

Go to Step 24

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Replace the fog lamp relay. Refer to Relay Replacement in Wiring Systems.

Has the repair been made?

Go to Step 24

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Replace the underhood fuse block. Refer to Underhood Electrical Center or Junction Block Replacement in Wiring Systems.

Has the repair been made?

Go to Step 24

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Important: Perform the set up procedures for the body control module. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.

Replace the body control module (BCM). Refer to Body Control Module Replacement in Body Control Systems.

Has the repair been made?

Go to Step 24

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2