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My 1998 Silverado the high beams will turn off by there self and go to low and come back on whenever why does this happen

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  • Cars & Trucks Master
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Check the operation of the light switch then the operation of the light control module

Posted on Apr 25, 2017

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I have a 2001 Silverado. When the high beams are switched on, the low beams go off and frankly the road is dark but the trees look good! Is this correct or do I have a faulty switch on my steering co


You are correct! When the high beam is turned on the low beam should still be active! What type of bulb are you using? Are the high and low beam from the same bulb or separate!

Oct 23, 2014 | 2001 Chevrolet Silverado 1500

1 Answer

My high beams won't turn off, even when my truck is not on. 05' Chevy Silverado 1500


The headlamps are controlled by the Body Control Module (BCM) The first thing I would check for is the Headlamp Hi Relay. It is located in the underhood fuse/relay box. If pulling the relay out turns your high beams off, try taking out the low beam relay and putting it in the high beam position. If the headlamps stay off, try plugging the high beam relay into the low beam position. If the low beams now come on, the relay is shorted.

If none of this works, I would recommend scanning your BCM to see if there are any fault codes.

Feb 05, 2011 | Chevrolet 1500 Cars & Trucks

1 Answer

1998 GMC Sierra has running lights and high beams but no low beams. Headlight switch is not the problem


first off, be sure your low beams aren't both burned out. it happens all the time. next check your dimmer switch operation. (i'm betting on low beams burned out) good luck.

Dec 21, 2010 | 1998 GMC Sierra

2 Answers

Headlight high beams do not work. I have even replaced the headlights. Low beam worksbut when switching to the high beams they turn off. Please help.


Hello. Generally when this happens, the high-low beam switch has gone bad and needs to be replaced. If you are handy you can do this your self. Otherwise, any autoelectric repair shop is your best bet. J.

Oct 13, 2010 | 1995 Nissan Pickup

1 Answer

Drl work but no low beams on my 1998 sierra..


either the low beams are burned out ,or the dimmer switch is bad.

May 10, 2010 | 1998 GMC Sierra

1 Answer

1998 silverado low beams dont work


There is a relay that toggles between high and low beam, when the turn signal switch lifted.
The relay could be burned out.
Pull the relay from the fuse box.
You can tell when you have the right one, because then no lights at all.
Read side of relay to understand pinout.
Use test light to see if turn signal ground happens when someone lifts on the turn signal handle.
If so, then relay probably bad.
Put it back in an feel for click?
Or take it out and run your own power and ground across the primary, to make it click out of the car.
About $10 at Shucks or Autozone.

Feb 15, 2010 | 1998 Chevrolet C1500

1 Answer

I have a 1998 Chevrolet K2500 that the headlights are not working correctly on. When I turn the headlights on nothing comes on unless I turn on the high beams, only the high beams are on, no low beams. ...


Somehow the tan wire from the low beams has been cut from the hi/lo switch and is now attached to the brown wire from the headlight switch. Trace the tan wire from the headlights to the hi/lo switch to see what happened.

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Aug 11, 2017 | 1998 Chevrolet K2500

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