GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic Lighting System Check?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Remove the DRL relay from relay center #2.

Do the (DRL) daytime running lamps remain on?

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Go to Step 4

Go to Step 3

3

Replace the DRL relay.

Is the repair complete?

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Go to Step 5

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4

Locate SHORT to voltage/ground in one or more of the following CKT's:

    • SHORT TO VOLTAGE - CKT 1346 (LT BLU) in the underhood fuse block.
    • SHORT TO GROUND - CKT 815 (WHT) between the DRL diode and the DRL relay.

Is the repair complete?

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Go to Step 5

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5

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2