Schematic Reference: Fog Lights Schematics

Did you perform the Lighting Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

1. Turn On the ignition, with the engine OFF.
2. Turn ON the rear fog lamps.

Does the rear fog lamp and the rear fog lamp indicator illuminate?

Go to Testing for Electrical Intermittents in Wiring Systems

Go to Step 3

1. Turn the ignition ON with the engine OFF.
2. Listen for an audible click at the rear fog lamp relay while pressing the rear fog lamp switch several times.

Do you hear a click from the relay?

Go to Step 4

Go to Step 6

At the inoperative lamp, test the rear fog lamp supply voltage circuit for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 5

At the inoperative lamp, test the ground circuit for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 14

1. Remove the rear fog lamp relay.
2. Connect a test lamp between the rear fog lamp relay control circuit at the relay connector and a battery positive ground circuit.
3. Turn the rear fog lamps ON.

Does the test lamp illuminate?

Go to Step 13

Go to Step 7

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

Did you find and correct the condition?

Go to Step 20

Go to Step 8

1. Disconnect the BCM connector.
2. Connect a test lamp between the rear fog lamp switch signal circuit and a battery positive voltage circuit.
3. Momentarily press the rear fog lamp switch.

Does the test lamp illuminate when the switch is pressed?

Go to Step 12

Go to Step 9

Test the rear fog lamp switch signal circuit for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 10

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

Does the test lamp illuminate?

Go to Step 11

Go to Step 15

Inspect for poor connections at the harness connector of the fog lamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 16

Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 17

Inspect for poor connections at the harness connector of the fog lamp relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 18

Inspect for poor connections at the harness connector of the bulb. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 19

Repair the open in the ground circuit to the rear fog lamp switch. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 20

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Replace the fog lamp switch. Refer to Rear Fog Lamp Switch Replacement .

Did you complete the replacement?

Go to Step 20

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Important: Perform the setup procedure for the BCM.

Replace the BCM. Refer to Body Control Module Replacement in Body Control System.

Did you complete the replacement?

Go to Step 20

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Replace the fog lamp relay.

Did you complete the replacement?

Go to Step 20

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Replace the inoperative bulb. Refer to Rear Fog Lamp Bulb Replacement .

Did you complete the replacement?

Go to Step 20

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3