GMC/Chevy Technicians, I need help, jimr where are you?

[NathanY]

I have a 1999 GMC Jimmy SLE. I am having problems with the headlights. They are the automatic type. Sometimes they come on, sometimes they dont. When they decide that they dont want to come on, they will not turn on manually either. I have no problems with the high beams, or the park lights, just the daytime running lights and the head lights.

 

[Ralphy]

Re: GMC/Chevy Technicians, I need help, jimr where are you?

Hey Nate, <br />No technician here, but I have a 98 Sonoma and there is a small light sensor on the passenger side dash. Looks like a small nipple. If somehow you accidently covered it or it is dirty, this could be causing the problem. Probably too simple a fix but might be worth checking.

 

[Bob_VT]

Re: GMC/Chevy Technicians, I need help, jimr where are you?

Try this web site http://www.chevytalk.com/ good information there.<br /><br />I am not sure if the light module is connected or part of the body control module. I would agree with Ralphy clean the dashboard sensor.<br /><br />Bob

 

[rayjay]

Re: GMC/Chevy Technicians, I need help, jimr where are you?

I've gotten some good info off this forum:<br /><br /> http://www.automotiveforums.com/vbulletin/forumdisplay.php?f=119

 

[NathanY]

Re: GMC/Chevy Technicians, I need help, jimr where are you?

I have eliminated the dash sensor because when this happens, the lights will not come on with the headlight switch either.

 

[dolluper]

Re: GMC/Chevy Technicians, I need help, jimr where are you?

It sounds like your Daytime Running Lamp diode is faulty or connector loose <br />It is located on your brake pedal the bracket that holds the brake pedal rightside close to where pedal pivots

 

[jimr]

Re: GMC/Chevy Technicians, I need help, jimr where are you?

I would guess the DRL relay or lighting control module is acting up. I hate automatic headlights my wifes car messes up sometimes while decelerating they will actually pulse almost like a strobe and the dealer cant fix it.

 

[dolluper]

Re: GMC/Chevy Technicians, I need help, jimr where are you?

Jimr you have cruise on that

 

[jimr]

Re: GMC/Chevy Technicians, I need help, jimr where are you?

it is a loaded 01 buick regal I can't tinker on it for about 5k more miles

 

[dolluper]

Re: GMC/Chevy Technicians, I need help, jimr where are you?

A couple of fast tests <br />set your parking brake<br />then to key to run <br />check and see if LO BEAMS ON ----off checks good<br />Next release parking brake dash brake light goes out ---is good<br />next turn key to run and apply parking brake<br />check to see if LO BEAMS OFF----on checks good<br />now if none of the above check out good you may have a short or bad Module<br />Diode TEST<br />release parking brake dash light goes out<br />disconnect diode connector on brake pedal bracket<br />turn key to run <br />connect test light to TERM"A"[dark blue wire] to ground <br />doesn't light check for shorts in the wire to the module [dark blue] module is behind R/S kick panel<br />no shorts replace module <br />IF IT LIGHTS check for bad connection at module or shorts in tan wire, tan wire runs to dimmer switch and headlights ,if you find no shorts replace diode<br />AFTER ALL THIS YOU MIGHT BE LUCKEY IF NOT let me know more things to check even headlight switch and grounds Also let me know when it happens in daylight or in darkness