Schematic Reference: Headlights/Daytime Running Lights (DRL) 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 headlamp switch.
3. Place the headlamp dimmer switch in the high beam position.

Do the high beam headlamps operate properly?

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

Go to Step 3

Are both high beam headlamps inoperative?

Go to Step 4

Go to Step 9

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Turn ON the high beam headlamps.
4. With the scan tool, observe the High Beam Select Switch parameter in the body control module (BCM) exterior lamps data list.

Does the High Beam Select Switch parameter display ACTIVE?

Go to Step 6

Go to Step 5

1. Turn OFF the ignition.
2. Disconnect the turn signal/multifunction switch C2 harness connector.
3. Connect a 3-amp fused jumper between the headlamp switch high beam signal circuit and the headlamp low beam relay control circuit at the turn signal/multifunction switch C2 harness connector.
4. Turn ON the ignition, with the engine OFF.
5. Turn ON the headlamps.
6. With the scan tool, observe the High Beam Select Switch parameter in the BCM exterior lamps data list.

Does the High Beam Select Switch parameter display ACTIVE?

Go to Step 14

Go to Step 12

1. Turn OFF the ignition.
2. Disconnect the headlamp HIGH BEAM relay located in the underhood fuse block. Refer to Relay Replacement in Wiring Systems.
3. Connect a test lamp between the headlamp high beam relay control side supply voltage circuit and the headlamp high beam relay control circuit.
4. Turn ON the ignition, with the engine OFF.
5. Turn ON the high beam headlamps.

Does the test lamp illuminate?

Go to Step 7

Go to Step 11

Connect a test lamp between the headlamp high beam relay switch side supply voltage circuit and a good ground.

Does the test lamp illuminate?

Go to Step 8

Go to Step 19

1. Turn OFF the ignition.
2. Connect a 40-amp fused jumper between the headlamp high beam relay switch side supply voltage circuit and the headlamp high beam supply voltage circuit.
3. Turn ON the ignition, with the engine OFF.

Do both high beam headlamps illuminate?

Go to Step 15

Go to Step 9

1. Turn OFF the ignition.
2. Disconnect the inoperative high beam headlamp.
3. Connect a test lamp between the high beam headlamp supply voltage circuit and the ground circuit of the inoperative high beam headlamp.
4. Turn ON the ignition, with the engine OFF.
5. Turn ON the high beam headlamps.

Does the test lamp illuminate?

Go to Step 17

Go to Step 10

Test the headlamp high beam supply voltage circuit for an open, high resistance, or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 24

Go to Step 18

Test the headlamp high beam relay control circuit for an open, high resistance, or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 24

Go to Step 16

Test the headlamp switch high beam signal circuit for an open, high resistance, or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 24

Go to Step 13

Test the headlamp low beam relay control circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 24

Go to Step 16

Inspect for poor connections at the C2 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 24

Go to Step 20

Inspect for poor connections at the headlamp high beam 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 BCM. 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 high beam headlamp bulb. 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

Locate and repair an open or high resistance in the headlamp ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 24

--

Locate and repair an open or high resistance in the switch side supply voltage circuit of the headlamp high beam relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 24

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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 24

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Replace the headlamp high beam relay. Refer to Relay Replacement in Wiring Systems.

Did you complete the replacement?

Go to Step 24

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

Did you complete the replacement?

Go to Step 24

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Replace the inoperative high beam headlamp bulb. Refer to Headlamp Assembly or Headlamp Bulb and/or Cornering, Sidemarker, Park, Turn Signal 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