Schematic Reference: Fog Lights Schematics

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

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

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

Do the front fog lamps operate properly?

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

Go to Step 3

Are both front fog lamps inoperative?

Go to Step 4

Go to Step 18

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, observe the Front Fog Lamp Switch parameter in the body control module (BCM) lighting data list.
4. Turn the front fog lamp switch ON and OFF.

Does the scan tool indicate the front fog lamp switch parameter changes from Active to Inactive as the switch is cycled?

Go to Step 5

Go to Step 10

1. Turn the front fog lamp switch to the ON position.
2. With a scan tool, observe the Fog Lamp Relay Cmd. in the BCM lighting data list.

Does the scan tool indicate the fog lamp relay Cmd. parameter is ON?

Go to Step 6

Go to Step 13

1. Turn OFF the ignition.
2. Disconnect the FRT FOG LP relay. Refer to Relay Replacement in Wiring Systems.
3. Connect a 15-amp fused jumper between the FRT FOG LP relay switched voltage supply circuit and the front fog lamp voltage supply circuit.

Do the front fog lamps illuminate?

Go to Step 7

Go to Step 16

1. Connect a test lamp between the front fog lamp relay control circuit and ground at the FRT FOG LP relay terminal.
2. Turn ON the ignition, with the engine OFF.
3. Turn the front fog lamp switch to the ON position.

Do the test lamp illuminate?

Go to Step 8

Go to Step 9

Locate and repair an open or high resistance in the FRT FOG LP relay ground 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 15

Locate and repair an open, high resistance, or short to ground in the front 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 24

Go to Step 17

1. Turn OFF the ignition.
2. Disconnect the turn signal/multifunction switch.
3. Connect a 3-amp fused jumper between the front fog lamp switch signal circuit and the front fog lamp switch ground circuit.
4. Turn ON the ignition, with the engine OFF.
5. With a scan tool observe the Front Fog Lamp Switch parameter.

Does the scan tool display Active?

Go to Step 14

Go to Step 11

Locate and repair an open or high resistance in the front fog lamp switch ground 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 12

Locate and repair an open, high resistance, or short to voltage in the front fog lamp switch signal 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 13

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 24

Go to Step 20

Inspect for poor connections at the harness connector of the turn signal/multifunction 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 24

Go to Step 21

Inspect for poor connections at the FRT FOG LP 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 24

Go to Step 23

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

Did you find and correct the condition?

Go to Step 24

Go to Step 17

Inspect for poor connections at the harness connector of the underhood fuse block. 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 24

Go to Step 22

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

Did you find and correct the condition?

Go to Step 24

Go to Step 19

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

Did you find and correct the condition?

Go to Step 24

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Replace the BCM. Refer to Body Control Module Replacement in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 24

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

Did you complete the replacement?

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.

Did you complete the replacement?

Go to Step 24

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Replace the FRT FOG LP relay. Refer to Relay Replacement in Wiring Systems.

Did you complete the replacement?

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