GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Lighting Systems Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Place the gear selector in the PARK position.

Do the daytime running lamps remain illuminated?

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Go to Step 3

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

3

Disconnect the DRL relay from the underhood relay center.

Do the daytime running lamps remain illuminated?

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Go to Step 4

Go to Step 5

4

Repair the short to voltage in the DRL supply voltage circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 6

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5

Replace the DRL relay.

Did you complete the replacement?

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Go to Step 6

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6

Operate the system in order to verify the repair.

Did you find and correct the condition?

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System OK

Go to Step 2