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 park lamps.
3. Turn ON the fog lamps.

Do both fog lamps illuminate?

Go to Testing for Electrical Intermittents in Wiring Systems

Go to Step 3

Is only one lamp inoperative?

Go to Step 4

Go to Step 6

At the inoperative lamp, test the front fog lamps 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 27

Go to Step 5

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

Did you find and correct the condition?

Go to Step 27

Go to Step 20

1. Turn ON the park lamps.
2. With the scan tool, observe the Park Lamps Data parameter.

Does the scan tool display ON?

Go to Step 7

Go to Park Lamps Inoperative

With the scan tool, command the fog lamps ON.

Do the fog lamps illuminate?

Go to Step 8

Go to Step 11

1. With the scan tool, read the front fog lamp switch status.
2. While reading the scan tool, press the fog lamp switch and hold the switch.

Does the scan tool display the switch status as ON?

Go to Step 9

Go to Step 14

With the scan tool, read the Park Lamps status.

Does the scan tool display the switch status as ON?

Go to Step 18

Go to Step 10

1. Turn OFF the ignition.
2. Disconnect the BCM connector C2.
3. Turn the ignition ON, with the engine OFF.
4. Connect a test lamp between the interior park lamps supply voltage circuit of the BCM and a good ground.

Does the test lamp illuminate?

Go to Step 18

Go to Step 22

Test the front fog lamps supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 12

1. Disconnect the fog lamp relay.
2. Connect a test lamp between the fog lamp relay control circuit of the fog lamp relay and a battery positive voltage circuit.
3. While probing, press the switch the switch.

Does the test lamp illuminate?

Go to Step 19

Go to Step 13

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

Did you find and correct the condition?

Go to Step 27

Go to Step 14

1. Turn OFF the ignition.
2. Remove the fog lamp switch from instrument panel (IP) without disconnecting the connector.
3. Connect a test lamp between the switch ground circuit of the fog lamp switch and a battery positive voltage circuit.

Does the test lamp illuminate?

Go to Step 15

Go to Step 21

1. Disconnect the BCM.
2. Connect a test lamp between the front fog lamp switch signal circuit of the BCM and a battery positive voltage circuit.
3. While probing, press the switch and hold the switch.

Does the test lamp illuminate?

Go to Step 18

Go to Step 16

Test the front fog lamp switch signal circuit of the BCM 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 27

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 27

Go to Step 23

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 27

Go to Step 24

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 27

Go to Step 25

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 27

Go to Step 26

Repair the open in the ground circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 27

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Repair the interior park lamps supply voltage circuit.

Did you complete the repair?

Go to Step 27

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Replace the fog lamp switch. Refer to Fog Lamp and Cargo Lamp Switch Assembly Replacement .

Did you complete the replacement?

Go to Step 27

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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 27

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Replace the fog lamp relay.

Did you complete the replacement?

Go to Step 27

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Replace both lamps. Refer to Front Fog Lamp Replacement .

Did you complete the replacement?

Go to Step 27

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3