Been there done that. Lights still went from low or high beam to no daytime running light when I took the fuse out. I also tried to hot wire across the relay and that didn't help. Any other suggestions? Know where I can get a copy of the headlight wiring diagram anywhere?
I have had the same problem with my 97 S10. I looked at the GM iring diagram and found that the headlight circuit runs directly through the main headlight switch with no fuse or relay at all. The high low beam switch cannot shut the circuit off completely and therefore make the clicking relay sound that is heard. The daytime running light module looks for a headlight on signal and therefore shuts off the running lights. So when the headlights cut on and off the clicking you hear is the day time running light relay, turning them on thinking you are shutting the headlight switch on and off. Inside the headlight switch itself is a thermal metallic circuit protector similar to whats inside a flasher switch. This is the only logical place for the headlight circuit to cut out since it is a directly wired circuit as explained before. Replace your headlight switch for less than 20 bucks from autozone.
Ya know it kinda sounds like the headlight switch that switches from high beam to low beam has a bad contact. You don't have one of those 4-beam modules that turn on all 4 lights on high beam do you? that thing screwed my whole headlight system up, I ended up throwing it in the trash.
I have the chiltons and haynes manual, I'm sure between the two we'll find a good diagram. I gotta get my youngin to open house at school, but I'll pull the books out and send you the wiring diagram.
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DEFINITION: This diagnostic procedure should only be used if the high beam headlamps are operating properly and the low beams are inoperative.
1
Did you perform the Headlights System Check?
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Go to Step 2
Go to Headlight System Check
2
Does the test lamp light?
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Go to Step 3
Go to Step 5
3
Does the test lamp light?
--
Go to Step 4
Go to Step 6
4
Does the test lamp light?
--
Go to Step 7
Go to Step 8
5
Replace the headlamp dimmer switch.
Is the repair complete?
--
Go to Headlight System Check
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6
Repair the open in CKT 359 (PPL) between the headlamp dimmer switch and the daytime running lamp relay.
Is the repair complete?
--
Go to Headlight System Check
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7
Replace the high/low beam headlamps.
Is the repair complete?
--
Go to Headlight System Check
--
8
Is the repair complete?
--
Go to Headlight System Check
--
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