Question about 1999 Chevrolet Astro

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Where is the Daytime driving Lamp relay located

The running lights (daytime headlights) no longer come on when ignition is on. The wiring diagram shows a DRL relay (daytime running lights) but does not state where this is located?

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  • Bruce Tillson Jun 07, 2012

    What kind of car is it? Can't give much info without that fact.

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  • Chevrolet Master
  • 6,826 Answers

Follow the wires to the drl relay. It must be inline from the regular light switch to the headlamps. I have a 1990 Cadillac Deville that has an aftermarket module that controls the daytime running lamps, and it is mounted on the driver's side wheel well.

Some relays are found in the fuse box under the hood.

If your daytime running lamps burnt out, take it to an electrical shop and ask them to check it out.

If you buy an aftermarket daytime running lamp kit, they can install it for you.

But, I agree, you should check for voltage and function at the relay for the daytime running lamps on your Astro.

But, if all else fails, the electrical shop should be able to diagnose and repair this problem.

Posted on Jul 21, 2010

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The biggest problem with the DLR's on these vehicles is that the bulbs burn out like crazy. I out in bulbs that are rated at a higher voltage---if the bulb says 12 v on it , get a bulb that is rated at 14 or even 18 volts. May not be as bright, but they won't burn out very often.

Posted on Jun 07, 2012

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Headlamps Inoperative - Low Beams

Step

Action

Value(s)

Yes

No

DEFINITION: This diagnostic procedure should only be used if the high beam headlamps are operating properly and the low beams are inoperative.

1

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Go to Step 2
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2

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3

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Go to Step 4
Go to Step 6

4

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Go to Step 7
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5

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Is the repair complete?
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Go to Headlight System Check
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Repair the open in CKT 359 (PPL) between the headlamp dimmer switch and the daytime running lamp relay.

Is the repair complete?
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Go to Headlight System Check
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7

Replace the high/low beam headlamps.

Is the repair complete?
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Go to Headlight System Check
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8

  1. Inspect for an open in CKT 12 (TAN) between the daytime running lamp relay and S120, repair as necessary.
  2. Replace the daytime running lamp relay if no open was found in CKT 12 (TAN) between the daytime running lamp relay and S120.

Is the repair complete?
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Go to Headlight System Check
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