07 tahoe low beams not working

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HonkeyAdonis

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2wd, flex fuel. High beams, turn signals, drls still work, just not the low beams. Replaced fuses, relay, and bulbs, still not working. Do I use ac voltage setting and check female side? Where would it be grounded? I can't find this information and am running out of ideas. Anything helps. Thanks.
 

Geotrash

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2wd, flex fuel. High beams, turn signals, drls still work, just not the low beams. Replaced fuses, relay, and bulbs, still not working. Do I use ac voltage setting and check female side? Where would it be grounded? I can't find this information and am running out of ideas. Anything helps. Thanks.
Time to get out your test meter and check for voltage at the headlight connectors, voltage at the switch when in the on position, and continuity between the switch and the connectors. Are your taillights coming on when the headlight switch is turned on?
 
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HonkeyAdonis

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With the switch in auto, they don't come if bright out. I covered ambient light sensor and they came on and also work when manually putting switch into on position. I also got a new switch and swapped out just to see if it would work, but no luck. Do I put meter on ac or DC? I thought I checked ohms and found no resistance, but I'm not that savvy with the meter or electrical work in general. Appreciate the help though.
 

Jimmyy

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DC. Try the body/frame for the negative. If that works try the negative going to the headlight.
 

Fless

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I don't get it; the way you describe it sounds like they work when it's dark but not when it's light. Are you saying that the low beams NEVER come on?
 
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Doubeleive

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With the switch in auto, they don't come if bright out. I covered ambient light sensor and they came on and also work when manually putting switch into on position. I also got a new switch and swapped out just to see if it would work, but no luck. Do I put meter on ac or DC? I thought I checked ohms and found no resistance, but I'm not that savvy with the meter or electrical work in general. Appreciate the help though.
UMMM, that's normal operation.
if you want low beams on during the daytime flip the switch to "on"
did you have a few too many beers? :cheers:
 
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HonkeyAdonis

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When I first tested the connectors the driver side was reading .08 at the 20v DC setting, got to the passenger side and got nothing, went back to the driver side and got nothing as well. That was with the switch on. Only thing that happened in the time frame of me moving to the passenger side was the clutch fan kicked on.
 

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