Schematic Reference: Fog Lights Schematics

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

Did you perform the Lighting System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

1. Turn the headlamp switch to the HEAD position.
2. Press and release the rear fog lamp switch .

Are both rear fog lamps operating properly?

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

Go to Step 3

Is only one rear fog lamp inoperative?

Go to Step 12

Go to Step 4

Check for an open in the RR FOG LP Fuse.

Is the RR FOG LP Fuse open?

Go to Step 27

Go to Step 5

1. Remove the fog lamp relay.
2. Probe the coil side supply of the rear fog lamp relay connector with a test lamp that is connected ground.
3. Probe the switch side supply of the rear fog lamp relay connector with a test lamp that is connected to ground.

Does the test lamp illuminate for both tests?

Go to Step 6

Go to Step 26

Install a fused jumper across the switch side supply circuit and the fog lamps supply voltage circuit of the rear fog lamp relay connector. Refer to Circuit Testing in Wiring Systems.

Do the fog lamps illuminate?

Go to Step 7

Go to Step 15

Using a test lamp connected to battery positive voltage, probe the control circuit of the rear fog lamp relay.

Does the test lamp illuminate when the fog lamp switch is pressed?

Go to Step 32

Go to Step 8

1. Disconnect the rear fog lamp module.
2. Using a test lamp connected to ground, probe the headlamp switch signal circuit of the rear fog lamp module.

Does the test lamp illuminate?

Go to Step 9

Go to Step 25

Using a test lamp connected to battery positive voltage, probe the ground circuit of the rear fog lamp module.

Does the test lamp illuminate?

Go to Step 10

Go to Step 23

1. Using a test lamp connected to battery positive voltage, probe the fog lamp switch signal circuit of the fog lamp module connector.
2. Press and release the rear fog lamp switch.

Does the test lamp illuminate when the rear fog lamp switch is pressed?

Go to Step 17

Go to Step 11

1. Disconnect the window wiper/washer and multifunction switch connector.
2. Using a test lamp connected to battery positive voltage, probe the ground circuit of the fog lamp switch connector.

Does the test lamp illuminate?

Go to Step 16

Go to Step 28

1. Remove the inoperative fog lamp bulb.
2. Using a test lamp, probe between the fog lamps supply voltage circuit and the ground circuit of the inoperative fog lamps.

Does the test lamp illuminate?

Go to Step 29

Go to Step 13

1. Disconnect the tail lamp connector of the inoperative fog lamp.
2. Using a test lamp connected to ground, probe the fog lamp supply voltage circuit of the inoperative tail lamp connector.

Does the test lamp illuminate?

Go to Step 14

Go to Step 18

Using a test lamp, probe between the ground circuit and the fog lamp supply voltage circuit of the inoperative tail lamp connector.

Does the test lamp illuminate?

Go to Step 31

Go to Step 19

1. Disconnect one of the tail lamp connectors.
2. Probe the fog lamp supply voltage circuit of the tail lamp connector with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 20

Go to Step 24

1. Connect a fused jumper between the switch signal circuit and the ground circuit of the fog lamps switch connector. Refer to Circuit Testing in Wiring Systems.
2. Using a test lamp connected to battery positive voltage, probe the fog lamp switch signal circuit of the fog lamp module connector.

Does the test lamp illuminate?

Go to Step 30

Go to Step 21

1. Connect a fused jumper between the fog lamp relay control circuit of the fog lamps module connector and the ground. Refer to Circuit Testing in Wiring Systems.
2. Using a test lamp that is connected to battery positive voltage, probe the control circuit of the fog lamp relay connector.

Does the test lamp illuminate?

Go to Step 33

Go to Step 22

Repair the open or high resistance in the supply voltage circuit of the inoperative fog lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 34

--

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

Did you complete the repair?

Go to Step 34

--

Repair the open or high resistance in the ground circuit of the fog lamps. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 34

--

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

Did you complete the repair?

Go to Step 34

--

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

Did you complete the repair?

Go to Step 34

--

Repair the open or high resistance in the ground circuit of the rear fog lamp module. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 34

--

Repair the open or high resistance in the supply voltage circuit of the fog lamps. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 34

--

Repair the open or high resistance in the headlamp switch signal circuit of the rear fog lamp module. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 34

--

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

Did you complete the repair?

Go to Step 34

--

Repair the short to ground in the battery positive voltage circuit of the fog lamp relay or the fog lamp supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 34

--

Repair the open or high resistance in the rear fog lamp switch ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 34

--

Replace the inoperative rear fog lamp bulb. Refer to Tail Lamp Assembly and /or Backup, Sidemarker, Stop, Turn Signal Bulb Replacement .

Did you complete the replacement?

Go to Step 34

--

Replace the rear fog lamp switch. Refer to Instrument Panel Multifunction Switch Assembly Replacement in Instrument Panel, Gages, and Console.

Did you complete the replacement?

Go to Step 34

--

Replace the tail lamp assemble that houses the inoperative fog lamp. Refer to Tail Lamp Assembly and /or Backup, Sidemarker, Stop, Turn Signal Bulb Replacement .

Did you complete the replacement?

Go to Step 34

--

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

Did you complete the replacement?

Go to Step 34

--

Replace the rear fog lamp module.

Did you complete the replacement?

Go to Step 34

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2