Did you perform the Lighting Systems Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

Verify that the DRL headlamps are inoperative.

Do the DRL headlamps operate normally?

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

Go to Step 3

Use the Scan Tool to inspect for the following related Body Control Module (BCM) Data/ Input parameters and Output controls.

Refer to Scan Tool Data List in Body Control System for typical values and definitions.

Did you find and correct a problem?

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Go to Step 9

Go to Step 4

Turn the headlamp switch to the HEAD position.

Do the headlamps operate properly in the LO position?

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Go to Step 5

Go to Headlamps Inoperative - Low Beams

Turn the headlamp dimmer switch to the HI position.

Do the headlamps operate properly in the HI position?

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Go to Step 6

Go to Headlamps Inoperative - High Beams

1. With the key in RUN, engine off, and the Headlamp Switch in the AUTO position, remove the DRL Relay from the Underhood Fuse Block.
2. Use a J 39200 Digital Multimeter (DMM) to check for continuity to ground from terminal 1 at the DRL Relay connector in the Underhood Fuse Block. Refer to Circuit Testing in Wiring Systems.

Is continuity present?

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Go to Step 8

Go to Step 7

Locate and repair the open or high resistance in CKT 592 (LT GRN/BLK). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Step 9

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Replace the DRL Relay.

Is the repair complete?

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Go to Step 9

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Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3