Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics

Did you perform the Lighting System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

1. Turn the ignition to the ON position.
2. Turn the headlamp switch to the PARK position.
3. Place the front fog lamp switch to the ON position.

Are the front fog lamps ON?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

Is only one fog lamp inoperative?

Go to Step 16

Go to Step 4

Check the FRT PARK LPS fuse for an open.

Is the FRT PARK LPS fuse open?

Go to Step 14

Go to Step 5

Check the fuse 28 for an open.

Is the fuse 28 open?

Go to Step 13

Go to Step 6

1. Disconnect front fog lamp relay 16.
2. Turn the ignition to the ON position.
3. Connect a test lamp between the switch side feed of the relay 16 and a good ground.

Does the test lamp illuminate?

Go to Step 7

Go to Step 25

1. Turn the headlamp switch to the PARK position.
2. Place the headlamp switch dimmer switch in the low beam position.
3. Connect a test lamp between the coil side ground of the front fog lamp relay 16 and battery voltage.

Does the test lamp illuminate?

Go to Step 8

Go to Step 15

1. With the front fog lamp switch in the ON position.
2. Connect a test lamp between the coil side ground of the front fog lamp relay 16 and the control circuit of relay 16.

Does the test lamp illuminate?

Go to Step 10

Go to Step 9

1. Disconnect the front fog lamp switch connector.
2. Connect a test lamp between the supply voltage circuit of the front fog lamp switch and a good ground.

Does the test lamp illuminate?

Go to Step 11

Go to Step 21

Connect a fused jumper between the switch side feed of the front fog lamp relay 16 and the front fog lamps supply voltage circuit of the front fog lamp relay 16.

Do the front fog lamps illuminate?

Go to Step 24

Go to Step 12

1. Connect the front fog lamp switch connector.
2. Place the front fog lamp switch in the ON position.
3. Backprobe with a test lamp between the front fog lamp relay control circuit of the front fog lamp switch and a good ground.

Does the test lamp illuminate?

Go to Step 22

Go to Step 23

Connect a test lamp between the supply voltage circuit of the LH front fog lamp and a good ground.

Does the test lamp illuminate?

Go to Step 20

Go to Step 25

Test for a short to ground in the front fog lamp supply voltage circuit or the front fog lamp indicator supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 25

Test for a short to ground in the front fog lamp switch supply voltage circuit or the front fog lamp relay 16 control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 25

Test for a open or high resistance in the relay coil ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 25

Connect a test lamp between the supply voltage circuit of the inoperative front fog lamp connector and a good ground.

Does the test lamp illuminate?

Go to Step 17

Go to Step 18

Connect a test lamp between the ground circuit of the inoperative front fog lamp connector and the supply voltage circuit of the inoperative front fog lamp.

Does the test lamp illuminate?

Go to Step 26

Go to Step 19

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

Has the repair been made?

Go to Step 27

Go to Step 25

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

Has the repair been made?

Go to Step 27

--

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

Has the repair been made?

Go to Step 27

--

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

Has the repair been made?

Go to Step 27

--

Repair an open or high resistance in the control circuit of relay 16. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Has the repair been made?

Go to Step 27

--

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

Has the repair been made?

Go to Step 27

--

Replace relay 16.

Has the repair been made?

Go to Step 27

--

Replace the underhood junction block. Refer to Underhood Electrical Center or Junction Block Replacement in Wiring Systems.

Has the repair been made?

Go to Step 27

--

Replace the inoperative front fog lamp. Refer to Rear Fog Lamp Switch Replacement .

Has the repair been made?

Go to Step 27

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2

Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics

Did you perform the Lighting System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

1. Turn the ignition to the ON position.
2. Turn the headlamp switch to the HEAD position.
3. Press the rear fog lamp switch.

Are the rear fog lamps ON?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

Is only one fog lamp inoperative?

Go to Step 14

Go to Step 4

Check the HAZARD fuse for an open.

Is the HAZARD fuse open?

Go to Step 16

Go to Step 5

1. Disconnect the rear fog lamp relay.
2. Turn the ignition to the ON position.
3. Connect a test lamp between the switch side feed of the rear fog lamp relay and a good ground.

Does the test lamp illuminate?

Go to Step 6

Go to Step 22

Connect a test lamp between the coil side feed of the rear fog lamp relay and a good ground.

Does the test lamp illuminate?

Go to Step 7

Go to Step 21

Connect a fused jumper between the switch side feed of the rear fog lamp relay and the rear fog lamps supply voltage circuit of the rear fog lamp relay.

Do the rear fog lamps illuminate?

Go to Step 8

Go to Step 12

Connect a test lamp between the coil side feed of the rear fog lamp relay and the control circuit of the rear fog lamp relay.

Does the test lamp illuminate?

Go to Step 25

Go to Step 9

1. Disconnect the Body Control Module (BCM) connector.
2. Connect a test lamp between the rear fog lamp switch input circuit of the BCM and battery voltage.
3. Press the rear fog lamp switch.

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

Go to Step 11

Go to Step 10

1. Disconnect the rear fog lamp switch.
2. Connect a test lamp between the rear fog lamp switch ground circuit and battery voltage.

Does the test lamp illuminate?

Go to Step 13

Go to Step 20

Test for an open or short to battery voltage in the rear 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 28

Go to Step 27

Connect a test lamp between the supply voltage circuit of the LH rear fog lamp and a good ground.

Does the test lamp illuminate?

Go to Step 19

Go to Step 23

Test for an open in the rear fog lamp switch input circuit of the BCM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 24

Connect a test lamp between the supply voltage circuit of the inoperative rear fog lamp connector and a good ground.

Does the test lamp illuminate?

Go to Step 15

Go to Step 17

Connect a test lamp between the ground circuit of the inoperative rear fog lamp connector and the supply voltage circuit of the inoperative rear fog lamp.

Does the test lamp illuminate?

Go to Step 26

Go to Step 18

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

Has the repair been made?

Go to Step 28

--

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

Has the repair been made?

Go to Step 28

--

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

Has the repair been made?

Go to Step 28

--

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

Has the repair been made?

Go to Step 28

--

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

Has the repair been made?

Go to Step 28

--

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

Has the repair been made?

Go to Step 28

--

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

Has the repair been made?

Go to Step 28

--

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

Has the repair been made?

Go to Step 28

--

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

Has the repair been made?

Go to Step 28

--

Replace the rear fog lamp relay.

Has the repair been made?

Go to Step 28

--

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

Has the repair been made?

Go to Step 28

--

Replace the Body Control Module (BCM). Refer to Body Control Module Replacement in Body Control Systems.

Has the repair been made?

Go to Step 28

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2