Schematic Reference: Fog Lights Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

DEFINITION: Use this chart if either the front or the rear fog lamp is inoperative.

Did you perform the Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

1. Turn the ignition to the ON position, with the engine OFF.
2. Turn the headlamp switch to the PARK position.
3. Turn the fog lamps to the ON position.

Do both fog lamps illuminate?

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

Go to Step 3

Did only one lamp illuminate?

Go to Step 11

Go to Step 4

1. Remove the fog lamp relay.
2. Install a jumper between the fog lamp relay control circuit and the switched fog lamp voltage supply circuit.
3. Turn the ignition to the ON position.
4. Turn the fog lamps to the ON position.

Do the fog lamps illuminate?

Go to Step 12

Go to Step 5

1. Remove the jumper.
2. Install a 15A fused jumper between battery positive voltage and the switched fog lamp voltage supply circuit.

Do the fog lamps illuminate?

Go to Step 7

Go to Step 6

Test for a poor connection, open or a short to ground in the switched fog lamp voltage supply circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 17

Go to Step 15

1. Remove the jumper.
2. Reinstall the fog lamp relay.
3. Disconnect the BCM connector C1.
4. Install a fused jumper between battery positive voltage and the fog lamp relay control circuit.

Do the fog lamps illuminate?

Go to Step 9

Go to Step 8

Test for a poor connection, open or a short to ground in the fog lamp relay control circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 17

Go to Step 15

1. Reconnect the BCM connector C1.
2. Disconnect the BCM connector C2.
3. Using a test lamp connected to battery positive voltage, probe the fog lamp switch signal circuit.

Does the test lamp illuminate?

Go to Step 16

Go to Step 10

Test the fog lamp switch signal circuit for a poor connection, open or a short to battery positive voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 17

Go to Step 13

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

Did you complete the repair?

Go to Step 16

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Test for a poor connection or an open in the ground 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 17

Go to Step 14

Replace the multifunction switch. Refer to Turn Signal Multifunction Switch Replacement in Steering Wheel and Column.

Did you complete the replacement?

Go to Step 17

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

Did you complete the replacement?

Go to Step 17

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

Did you complete the replacement?

Go to Step 17

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Important: Perform the setup procedure for the BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Computer/Integrating Systems.

Replace the BCM. Refer to Body Control Module Replacement in Computer/Integrating Systems.

Did you complete the replacement?

Go to Step 17

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2