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Old 09-21-2019, 04:38 PM   #1
2teendaughters
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Default Right side head lights dim.

When lights are turned on the right side is very dim. Both high and low beam. When switched between high and low the opposite seems to happen. Getting 12vdc and as near as I can tell the ground is intact. Has the headlight switch taken a dump? or is there another possible check I can look into.

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Old 09-21-2019, 05:05 PM   #2
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Default Re: Right side head lights dim.

Which car?

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Old 09-21-2019, 05:17 PM   #3
2teendaughters
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Default Re: Right side head lights dim.

Sorry 2001 sl2

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Old 09-21-2019, 05:35 PM   #4
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Default Re: Right side head lights dim.

I'm not near service manuals for posting and going on memory but if I'm not mistaken, there are two wiring schematics, one for manually turning on headlights and the daytime running lights using a complicated wiring scheme. The drl circuit may affect manual lighting but not the other way. Drl uses a relay downstream from fuse(s), controlled by the bcm. Check all headlight fuses for looseness, drl relay and wiring in general. I'm not sure if your '01 SL2 uses parking or high beams for daytime running lights and complicates where to check. Some GM drl circuits use a combination of serial and parallel wiring along with adding a resistor in other drl circuits.

If this problem exists only in drl or manual lighting mode, the problem can be narrowed down. There may be wiring diagrams posted in other threads and you can use circuits from 2000 and up.

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Old 09-21-2019, 06:43 PM   #5
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Default Re: Right side head lights dim.

Quote:
Originally Posted by fdryer View Post
I'm not near service manuals for posting and going on memory but if I'm not mistaken, there are two wiring schematics, one for manually turning on headlights and the daytime running lights using a complicated wiring scheme. The drl circuit may affect manual lighting but not the other way. Drl uses a relay downstream from fuse(s), controlled by the bcm. Check all headlight fuses for looseness, drl relay and wiring in general. I'm not sure if your '01 SL2 uses parking or high beams for daytime running lights and complicates where to check. Some GM drl circuits use a combination of serial and parallel wiring along with adding a resistor in other drl circuits.

If this problem exists only in drl or manual lighting mode, the problem can be narrowed down. There may be wiring diagrams posted in other threads and you can use circuits from 2000 and up.
Fuses checked and relay replaced. These were my first thoughts. Only the right side is affected. Haven't seen a wire schematic. Wondering if circuit is split Left and Right in the headlight switch? There isn't any indication in the (PDM) power distribution module. Stumped non the less.

...
Craig

2000 Sl2 (1st Daughter 2nd Sl2)

2001 Sl2 (Wifes)

2002 Sl2 (2nd Daughter)

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Old 09-21-2019, 07:22 PM   #6
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1997 SL1
Post Re: Right side head lights dim.

Does this help

1995 SL1 236,300 2005>2018
1997 SL1 78,100 2014>????
CHECK YOUR OIL!!
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File Type: jpg 2001 SL2 Headlights.jpg (56.9 KB, 19 views)

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