Schematic Reference: Fog Lights Schematics

Connector End View Reference: Master Electrical Component List

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

1. Turn ON the ignition, with the engine OFF.
2. Turn ON the low beam headlamps.
3. Turn ON the front fog lamps.
4. Observe the rear fog lamps.
5. Turn ON and OFF the rear fog lamps.
6. Turn OFF the ignition .

Did the rear fog lamps operate properly?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool command the Rear Fog Lamps ON from the dash integration module (DIM) Output Control data list.

Do both of the fog lamps turn ON?

Go to Step 5

Go to Step 4

Are both of the rear fog lamps inoperative?

Go to Step 7

Go to Step 11

1. Position the rear fog lamp switch to the ON position.
2. With a scan tool, observe the Rear Fog Lamp Switch input parameter in the DIM Inputs data list.

Does the scan tool display ON?

Go to Step 20

Go to Step 6

1. Disconnect the multifunction, turn signal switch.
2. Connect a 3-amp fused jumper between the rear fog lamp switch signal circuit and the rear fog lamp switch ground circuit.
3. With a scan tool observe the Rear Fog Lamp Switch parameter.

Does the scan tool display ON?

Go to Step 19

Go to Step 12

1. Turn OFF the ignition.
2. Disconnect the rear fog lamp relay. Refer to Relay Replacement .
3. Turn ON the ignition, with the engine OFF.
4. Probe the rear fog lamp relay control side supply voltage circuit with a test lamp that connected to a good ground.

Does the test lamp illuminate?

Go to Step 8

Go to Step 23

Probe the rear fog lamp relay switch side supply voltage circuit with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 9

Go to Step 22

1. Connect a test lamp between the rear fog lamp relay control side supply voltage circuit and the fog lamp relay control circuit.
2. With a scan tool command the Rear Fog Lamps ON and OFF from the DIM Output Control data list.

Does the test lamp turn ON and OFF with each command?

Go to Step 10

Go to Step 17

1. Turn OFF the ignition.
2. Connect a 15-amp fused jumper between the rear fog lamp relay switch side supply voltage circuit and the fog lamp supply voltage circuit.
3. Turn ON the ignition, with the engine OFF.

Do both of the rear fog lamps illuminate?

Go to Step 18

Go to Step 11

1. Turn OFF the ignition.
2. Remove the inoperative fog lamp bulb.
3. Connect a test lamp between the inoperative fog lamps supply voltage circuit and the inoperative fog lamp ground circuit.
4. Turn ON the ignition, with the engine OFF.
5. Turn ON the rear fog lamp switch.

Does the test lamp illuminate?

Go to Step 21

Go to Step 14

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

Did you find and correct the condition?

Go to Step 28

Go to Step 13

Test the rear fog lamp switch signal circuit for high resistance, open or short to voltage. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 28

Go to Step 16

Test the fog lamps supply voltage circuit for an open, a high resistance or a short to ground. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 28

Go to Step 15

Test the fog lamp ground circuit for an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 28

Go to Step 20

Test the rear fog lamp switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 28

Go to Step 19

Test the rear fog lamp relay control circuit of the rear fog lamp relay for high resistance, an open or a short to voltage. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 28

Go to Step 20

Inspect for poor connections at the rear fog lamp relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 28

Go to Step 24

Inspect for poor connections at the harness connector of the multifunction, turn signal switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 28

Go to Step 25

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

Did you find and correct the condition?

Go to Step 28

Go to Step 26

Inspect for poor connections at the inoperative rear fog lamp bulb. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 28

Go to Step 27

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

Did you find and correct the condition?

Go to Step 28

--

Repair the high resistance or open in the control side supply voltage circuit of the rear fog lamp relay. Refer to Circuit Testing and Wiring Repairs .

Did you complete the repair?

Go to Step 28

--

Replace the in rear fog lamp relay. Refer to Relay Replacement .

Did you complete the replacement?

Go to Step 28

--

Replace the multifunction, turn signal switch. Refer to Turn Signal Multifunction Switch Replacement .

Did you complete the replacement?

Go to Step 28

--

Replace the DIM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 28

--

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

Did you complete the replacement?

Go to Step 28

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2