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 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 in Wiring Systems

Go to Step 3

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Turn OFF the rear fog lamps.
4. With a scan tool, observe the Rear Fog Lamp Switch parameter in the Dash Integration Module (DIM) Inputs Data List.

Does the scan tool indicate that the rear fog lamp switch is parameter Idle?

Go to Step 4

Go to Step 7

With a scan tool, observe the Rear Fog Lamp Relay status in the Rear Integration Module (RIM) Output Control Data List

Does the scan tool indicate the rear fog lamp relay parameter is Off?

Go to Step 5

Go to Step 13

1. Turn OFF the ignition.
2. Disconnect the rear fog lamp relay. Refer to Relay Replacement in Wiring Systems.
3. Turn ON the ignition, with the engine OFF.

Did the rear fog lamps turn OFF?

Go to Step 6

Go to Step 14

1. Turn OFF the ignition .
2. Connect a test lamp between the rear fog lamp relay control circuit and the fog lamp relay coil voltage supply circuit at the relay terminals.
3. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 8

Go to Step 12

1. Turn OFF the ignition.
2. Disconnect the turn signal/multifunction switch C 4 harness connector.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool observe the Rear Fog Lamp Switch parameter.

Does the scan tool indicate the Rear Fog Lamp Switch parameter is Idle?

Go to Step 11

Go to Step 9

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

Did you find and correct the condition?

Go to Step 19

Go to Step 13

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

Did you find and correct the condition?

Go to Step 19

Go to Step 10

Inspect for poor connections at the harness connector of the DIM. 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 19

Go to Step 15

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 19

Go to Step 16

Inspect for poor connections at the rear 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 19

Go to Step 17

Inspect for poor connections at the harness connector of the RIM. 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 19

Go to Step 18

Locate and repair a short to voltage in the rear fog lamps supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did to complete the repair?

Go to Step 19

--

Replace the DIM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming.

Did you complete the replacement?

Go to Step 19

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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 19

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

Did you complete the replacement?

Go to Step 19

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Replace the RIM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming.

Did you complete the replacement?

Go to Step 19

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2