Schematic Reference: Fog Lights Schematics

Did you review the Exterior Lighting System Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Lighting Systems

1. Turn the headlamp switch to the HEAD position.
2. Turn the fog lamp switch ON.
3. Turn the headlamp dimmer switch to the LOW BEAM position.

Do the fog lamps operate properly?

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

Go to Step 3

Is only one fog lamp inoperative?

Go to Step 8

Go to Step 4

1. Disconnect the fog lamp relay.
2. Probe the supply voltage circuit of the fog lamp relay coil with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 10

Probe the headlamp high beam supply circuit of the fog lamp relay with a test lamp that is connected to battery voltage.

Does the test lamp illuminate?

Go to Step 6

Go to Step 17

Probe the park lamps supply voltage circuit of the fog lamp relay with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 7

Go to Step 15

Connect a fused jumper between park lamps supply voltage circuit and the fog lamps supply voltage circuit of the fog lamp relay.

Do the fog lamps illuminate?

Go to Step 12

Go to Step 20

Probe the supply voltage circuit of the inoperative fog lamp with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 9

Go to Step 19

Probe between the ground circuit and the supply voltage circuit of the inoperative fog lamp with a test lamp.

Does the test lamp illuminate?

Go to Step 14

Go to Step 18

1. Disconnect the fog lamp switch.
2. Probe the park lamp supply voltage circuit of the fog lamp switch with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 11

Go to Step 16

Test for a high resistance or an open in the supply voltage circuit of the fog lamp relay coil. Refer to Circuit Testing and to 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 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 24

Go to Step 21

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 24

Go to Step 22

Inspect for poor connections at the harness connector of the inoperative front fog lamp. 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

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

Did you complete the repair?

Go to Step 24

--

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

Did you complete the repair?

Go to Step 24

--

Repair a high resistance or an open in the headlamp high beam supply circuit of the fog lamp relay. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 24

--

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

Did you complete the repair?

Go to Step 24

--

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

Did you complete the repair?

Go to Step 24

--

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

Did you complete the repair?

Go to Step 24

--

Replace the fog lamp relay. Refer to Fog Lamp Relay Replacement .

Did you complete the replacement?

Go to Step 24

--

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

Did you complete the replacement?

Go to Step 24

--

Replace the inoperative fog lamp. Refer to Front Fog Lamp Bulb Replacement .

Did you complete the replacement?

Go to Step 24

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2

Schematic Reference: Fog Lights Schematics

Did you review the Exterior Lighting System Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Lighting Systems

1. Turn the headlamp switch to the HEAD position.
2. Turn the fog lamp switch ON.

Do the fog lamps operate properly?

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

Go to Step 3

Is only one fog lamp inoperative?

Go to Step 8

Go to Step 4

1. Disconnect the fog lamp relay.
2. Probe the supply voltage circuit of the fog lamp relay coil with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 10

Probe the ground circuit of the fog lamp relay coil with a test lamp that is connected to battery voltage.

Does the test lamp illuminate?

Go to Step 6

Go to Step 17

Probe the park lamps supply voltage circuit of the fog lamp relay with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 7

Go to Step 15

Connect a fused jumper between park lamps supply voltage circuit and the fog lamps supply voltage circuit of the fog lamp relay.

Do the fog lamps illuminate?

Go to Step 12

Go to Step 20

Probe the supply voltage circuit of the inoperative fog lamp with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 9

Go to Step 19

Probe between the ground circuit and the supply voltage circuit of the inoperative fog lamp with a test lamp.

Does the test lamp illuminate?

Go to Step 14

Go to Step 18

1. Disconnect the fog lamp switch.
2. Probe the park lamp supply voltage circuit of the fog lamp switch with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 11

Go to Step 16

Test for a high resistance or an open in the supply voltage circuit of the fog lamp relay coil. Refer to Circuit Testing and to 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 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 24

Go to Step 21

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 24

Go to Step 22

Inspect for poor connections at the harness connector of the inoperative front fog lamp. 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

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

Did you complete the repair?

Go to Step 24

--

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

Did you complete the repair?

Go to Step 24

--

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

Did you complete the repair?

Go to Step 24

--

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

Did you complete the repair?

Go to Step 24

--

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

Did you complete the repair?

Go to Step 24

--

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

Did you complete the repair?

Go to Step 24

--

Replace the fog lamp relay. Refer to Fog Lamp Relay Replacement .

Did you complete the replacement?

Go to Step 24

--

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

Did you complete the replacement?

Go to Step 24

--

Replace the inoperative fog lamp. Refer to Front Fog Lamp Bulb Replacement .

Did you complete the replacement?

Go to Step 24

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2