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

Connector End View Reference: Lighting Systems Connector End Views or Computer/Integrating Systems Connector End Views in Computer/Integrating Systems

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

Verify that the low or high beam headlamps are inoperative.

Do the low and high beam headlamps operate normally?

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

Go to Step 3

Does the wiper activated headlamp (WAH) function of the wiper system operate normally?

Go to Step 6

Go to Step 4

With the key in RUN and the wiper switch in the LO position, use the scan tool to monitor the Front Wipers Active input parameter.

Does the scan tool parameter display Active?

Go to Step 12

Go to Step 5

Test the windshield wiper switch signal 1 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 20

Go to Step 19

1. Place the headlamp and panel dimmer switch in the ON position.
2. Turn the ignition ON with the engine OFF.
3. With a scan tool, observe the Headlamp On Switch data parameter in the body control module (BCM) data list.

Does the scan tool display Active?

Go to Step 9

Go to Step 7

1. Disconnect the headlamp and panel dimmer switch. Refer to Headlamp Switch Replacement .
2. Place a fused jumper between the headlamp switch headlamps on signal circuit and low reference circuit terminals.

Does the scan tool display Active?

Go to Step 13

Go to Step 8

Test for one of the following conditions in the headlamp and panel dimmer switch circuits. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct a condition?

Go to Step 20

Go to Step 12

1. Remove the headlamp relay. Refer to Relay Replacement in Wiring Systems.
2. Place a fused jumper between the battery positive voltage circuit and headlamp supply voltage circuit terminals to the headlamp relay in the underhood fuse block. Refer to Electrical Center Identification Views in Wiring Systems.

Do the low or high beam headlamps illuminate?

Go to Step 10

Go to Step 14

Test for a ground signal at the headlamp relay control circuit connector terminal. Refer to Circuit Testing and Electrical Center Identification Views in Wiring Systems.

Is a ground control signal present?

Go to Step 16

Go to Step 11

Test for an open or high resistance in the headlamp relay control circuit. Refer to Circuit Testing and Electrical Center Identification Views in Wiring Systems.

Did you find and correct a condition?

Go to Step 20

Go to Step 12

Inspect for poor connections at the harness connector of the BCM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 15

Inspect for poor connections at the harness connector of the headlamp and panel dimmer switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 17

Inspect for poor connections at the harness connector of the underhood fuse block and terminals at the beam select relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 20

Go to Step 18

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 20

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

Did you complete the repair?

Go to Step 20

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Replace the headlamp and panel dimmer switch. Refer to Headlamp Switch Replacement .

Did you complete the repair?

Go to Step 20

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

Did you complete the repair?

Go to Step 20

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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 repair?

Go to Step 20

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1. Use the scan tool in order to clear any induced DTCs.
2. Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3