SOURCE: Where is the Daytime driving Lamp relay located
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.
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