Schematic Reference: Fog Lights Schematics

Did you review the Exterior Lighting System Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Lighting Systems

1. Turn the ignition ON, with the engine OFF.
2. Turn the headlamp switch to the HEAD position.
3. Pull the turn signal lever toward you in order to illuminate the LOW headlamps.
4. Turn the fog lamp switch to the ON position.

Do both front fog lamps operate?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

Is only one front fog lamp inoperative?

Go to Step 12

Go to Step 4

1. Remove the fog lamp relay.
2. Probe the switch side feed circuit of the fog lamp relay connector with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 11

Install a fused jumper across the switch side feed circuit and the fog lamps supply voltage circuit of the fog lamp relay connector. Refer to Circuit Testing in Wiring Systems.

Did the fog lamps illuminate?

Go to Step 6

Go to Step 20

Probe the control circuit of the fog lamp relay connector with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 7

Go to Step 8

1. Insure that the high beam headlamps are OFF.
2. Probe the headlamp high beam voltage supply circuit of the fog lamp relay connector with a test lamp that is connected to battery voltage.

Does the test lamp illuminate?

Go to Step 21

Go to Step 18

1. Disconnect the rear window wiper/washer and multifunction switch connector C3.
2. Probe the park lamp supply voltage circuit of the fog lamp switch with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 9

Go to Step 19

1. Connect a fused jumper between the parklamps supply voltage circuit and the fog lamp relay control circuit of the fog lamp switch connector. Refer to Circuit Testing in Wiring Systems.
2. Probe the control circuit of the fog lamp relay connector with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 22

Go to Step 10

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

Did you find and correct the condition?

Go to Step 25

Go to Step 20

Test the switch side feed circuit of the fog lamp relay for a open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find an open in the switch side feed circuit of the fog lamp relay?

Go to Step 20

Go to Step 17

1. Remove the inoperative fog lamp.
2. Using a test lamp, probe between the fog lamps supply voltage circuit and the ground circuit of the inoperative fog lamps.

Does the test lamp illuminate?

Go to Step 23

Go to Step 13

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

Does the test lamp illuminate?

Go to Step 14

Go to Step 15

Using a test lamp, probe between the ground circuit and the supply voltage circuit of the inoperative fog lamp connector.

Does the test lamp illuminate?

Go to Step 24

Go to Step 16

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

Did you complete the repair?

Go to Step 25

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

Did you complete the repair?

Go to Step 25

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Repair the short to ground in the switch side feed circuit or fog lamps supply voltage circuit of the fog lamp relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 25

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Repair the open or high resistance in the headlamp high beam voltage supply of the fog lamp relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 25

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

Did you complete the repair?

Go to Step 25

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1. Test for poor connections at the junction block - underhood. Refer to Testing for Intermittent Conditions and Poor Connections .
2. If the connections are OK, replace the junction block - underhood. Refer to Underhood Electrical Center or Junction Block Replacement .

Is the repair complete?

Go to Step 25

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

Is the repair complete?

Go to Step 25

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

Did you complete the replacement?

Go to Step 25

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

Is the repair complete?

Go to Step 25

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

Is the repair complete?

Go to Step 25

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2