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

Did you perform the Lighting Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

Verify that the low and high beam headlamps are inoperative.

Do the headlamps operate normally?

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

Go to Step 3

1. Move the headlamp switch to the HEAD position.
2. Connect a test lamp to the headlamp supply voltage circuit terminal at any inoperative headlamp bulb connector. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

Go to Step 8

Go to Step 4

1. Remove the headlamp power relay from the underhood fuse block.
2. Connect a test lamp to the headlamp relay coil supply voltage circuit at the relay connector terminal. Refer to Electrical Center Identification Views and Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

Go to Step 7

Go to Step 5

1. Disconnect the headlamp switch.
2. Ensure that the switch is in the HEAD position.
3. Test that the headlamp switch has continuity between the battery positive voltage circuit input terminal and the headlamp power relay coil supply voltage circuit output terminal and that these terminals are not internally shorted to the ground terminal. Refer to Circuit Testing in Wiring Systems.

Was a problem found?

Go to Step 13

Go to Step 6

Test the headlamp power relay for an internal short to the ground terminal. Refer to Circuit Testing in Wiring Systems.

Was a problem found?

Go to Step 14

Go to Step 10

Connect a test lamp between the relay connector terminals of the headlamp relay coil supply voltage circuit and ground circuit in the underhood fuse block. Refer to Electrical Center Identification Views and Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

Go to Step 14

Go to Step 11

Test the headlamp dimmer switch signal circuit for continuity to ground. Refer to Circuit Testing in Wiring Systems.

Was a problem found?

Go to Step 9

Go to Step 15

Test the following circuits for an open or high resistance. Refer to Circuit Testing in Wiring Systems:

Was a problem found?

Go to Step 12

Go to Step 16

Repair the open, high resistance or short to ground in one of the following circuits. Refer to Wiring Repairs in Wiring Systems:

Did you complete the repair?

Go to Step 17

--

Repair the open or high resistance in the headlamp power relay ground circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 17

--

Repair the open or high resistance in one of the following circuits. Refer to Wiring Repairs in Wiring Systems:

Did you complete the repair?

Go to Step 17

--

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Did you complete the repair?

Go to Step 17

--

Replace the headlamp power relay.

Did you complete the repair?

Go to Step 17

--

Replace the multifunction headlamp dimmer switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering Wheel and Column.

Did you complete the repair?

Go to Step 17

--

Replace the headlamp grounding relay.

Did you complete the repair?

Go to Step 17

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3

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

Did you perform the Lighting Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

Verify that the low and high beam headlamps are inoperative.

Do the headlamps operate normally?

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

Go to Step 3

1. Move the headlamp switch to the HEAD position.
2. Connect a test lamp to the headlamp supply voltage circuit terminal at any inoperative headlamp bulb connector. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

Go to Step 9

Go to Step 4

1. Remove the headlamp power relay from the underhood fuse block.
2. Connect a test lamp to the headlamp relay coil supply voltage circuit at the relay connector terminal. Refer to Electrical Center Identification Views and Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

Go to Step 7

Go to Step 5

1. Disconnect the headlamp switch.
2. Ensure that the switch is in the HEAD position.
3. Test that the headlamp switch has continuity between the battery positive voltage circuit input terminal and the headlamp power relay coil supply voltage circuit output terminal and that these terminals are not internally shorted to the ground terminal. Refer to Circuit Testing in Wiring Systems.

Was a problem found?

Go to Step 6

Go to Step 15

Test the headlamp power relay for an internal short to the ground terminal. Refer to Circuit Testing in Wiring Systems.

Was a problem found?

Go to Step 16

Go to Step 11

Connect a test lamp between the relay connector terminals of the headlamp relay coil supply voltage circuit and ground circuit in the underhood fuse block. Refer to Electrical Center Identification Views and Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

Go to Step 8

Go to Step 12

Test the following circuits for an open, high resistance or short to ground. Refer to Circuit Testing in Wiring Systems:

Was a problem found?

Go to Step 13

Go to Step 16

Test the headlamp dimmer switch signal circuit for continuity to ground. Refer to Circuit Testing in Wiring Systems.

Was a problem found?

Go to Step 10

Go to Step 17

Test the following circuits for an open or high resistance. Refer to Circuit Testing in Wiring Systems:

Was a problem found?

Go to Step 14

Go to Step 18

Repair the open, high resistance or short to ground in one of the following circuits. Refer to Wiring Repairs in Wiring Systems:

Did you complete the repair?

Go to Step 19

--

Repair the open or high resistance in the headlamp power relay ground circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 19

--

Repair the open, high resistance or short to ground in one of the following circuits. Refer to Wiring Repairs in Wiring Systems:

Did you complete the repair?

Go to Step 19

--

Repair the open or high resistance in one of the following circuits. Refer to Wiring Repairs in Wiring Systems:

Did you complete the repair?

Go to Step 19

--

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Did you complete the repair?

Go to Step 19

--

Replace the headlamp power relay.

Did you complete the repair?

Go to Step 19

--

Replace the multifunction headlamp dimmer switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering Wheel and Column.

Did you complete the repair?

Go to Step 19

--

Replace the daytime running lamp (DRL) relay.

Did you complete the repair?

Go to Step 19

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3