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Username Post: Low Beam Headlights Don't Work        (Topic#202228)
cwmeco 
Lurker
Posts: 5

Reg: 10-31-08
10-31-08 06:58 PM - Post#1554336    

Sorry, I did a search, but didn't find an answer....

Just bought my first truck, 98 K2500 true work truck including vinyl mat on the floor. 100K miles and from Arizona. Can't believe how clean it is and no rust (I live in Michigan). It runs great and everything works except the low beam headlights. Not sure if DRL works; parking lights; no headlights and no DRL indicator light in the instrument cluster. If I turn the headlight switch to the headlights on position, the headlights do not light. If I then pull the turn signal stalk forward to activate the high beams, they work fine. Just no low beams.

I've tried to check all the wires and the switch and I'm now suspicious it is a problem with the DRL relay or module because it appears the high beams bypass the DRL system, while the lows go through the relay and module. Any experience with this? I'd sure like to be confident to drive the truck in the dark if I have to......

Thanks,

Chuck

 
Low priced Genuine GM Auto Parts
CDAUSA 
Needs to Get Out More Member
Posts: 12906

Loc: Texas Panhandle
Reg: 12-31-01
10-31-08 08:24 PM - Post#1554394    
    In response to cwmeco

Howdy!

It can be several things, best to run a test light over several areas to check. Light switch is the place to start, some here have reported alot of issues with the switch.

Now, my own experience, I lost the driving lights on mine where the plug in is, under the steering column cover and where the stalk wiring attaches to the plug. It's best to search out the route and progression first, cause that one isn't a fun fix.

 
cwmeco 
Lurker
Posts: 5

Reg: 10-31-08
10-31-08 08:39 PM - Post#1554401    
    In response to CDAUSA

Thanks for the quick response. I've done continuity testing through the whole circuit, but I'll look a the connection in the steering column again. I had a similar suggestion from another person so this looks like an area that needs more attention.

I'll keep looking!

Chuck

 
CDAUSA 
Needs to Get Out More Member
Posts: 12906

Loc: Texas Panhandle
Reg: 12-31-01
10-31-08 09:21 PM - Post#1554413    
    In response to cwmeco

The plug I refer to is just almost under the dash, that far forward. The "pins" corrode, then get hot and corrode some more. I just cut out the offending ends and hard wired it, that was about 320K miles ago and hasn't given any problems since.

But I did not have time to fix it when this happened, so I ran a few nights with a hotwire and alligator clip to the driving light wire, under the hood

Oh and, I had forgotten this, if you have a tilt wheel, raise and lower it to the extremes to see if it makes any difference in the light.

 
cwmeco 
Lurker
Posts: 5

Reg: 10-31-08
11-01-08 01:26 PM - Post#1554787    
    In response to CDAUSA

Thanks for the tip. I tried numerous tilts of the steering column to each extreme, but the lights didn't even flicker during that process. So, I'll keep looking. Just received a service manual, so hope it will help me find suspicious areas.

I did find out and was surprised that the DRLs only go on when the vehicle is in gear. I had high hopes that it was that simple, but no luck. It's a more mischevoous gremliln at work.....

Chuck

 
someotherguy 
Moderator
Posts: 25739
someotherguy
Age: 44
Loc: Texas
Reg: 08-01-03
11-01-08 06:08 PM - Post#1554973    
    In response to cwmeco

DRL's should operate full time when the key is on and parking brake not applied.

Beware that the headlight switch design from 95-up is pretty flaky; you either have one that works forever, or you are constantly replacing them. The harness leading to the switch can burn up, too. I once bought a brand new switch from the dealer (not a generic parts house junker) to replace a dead switch, and had to "jiggle" the new switch sometimes to make it work.

DRL's may not be working due to several reasons. Fuse may be pulled, diode may be bad.

Richard
94 C2500LD / 97 Suburban LS1 / 06 300C SRT8
Check out my truck shop projects


 
someotherguy 
Moderator
Posts: 25739
someotherguy
Age: 44
Loc: Texas
Reg: 08-01-03
11-01-08 08:57 PM - Post#1555073    
    In response to someotherguy

Just read on another forum someone with a very similar problem on a '99 one ton (still the "old" body style) - turned out to be the low beam relay. I haven't messed with this before so I was unaware such an animal existed. He didn't happen to mention which one it was, but implied it's in the panel that's under the driver's side of the dash.

Richard
94 C2500LD / 97 Suburban LS1 / 06 300C SRT8
Check out my truck shop projects


 
cwmeco 
Lurker
Posts: 5

Reg: 10-31-08
11-01-08 09:33 PM - Post#1555092    
    In response to someotherguy

Just got a DVD of the service manual today and have reviewed the lighting section. I think what the other person is referring to is the DRL relay that's in the Convenience Center on the left side of the IP. That could be my problem because I checked and.......I don't have one. I'll have to make a trip to the auto parts store tomorrow to see if I can get one. Hope it's not a dealer only part. I'll keep you posted.

Chuck

 
cwmeco 
Lurker
Posts: 5

Reg: 10-31-08
11-02-08 04:59 PM - Post#1555518    
    In response to cwmeco

Well, that was an easy fix. I bought a relay, not specifically for this application, but with the same size and pin configuration. I now have DRLs working. No light in the dashboard, but the headlights now work. Having read a few forums on this, it seems there are quite a few that don't want their headlights on during the day, so they disable the DRLs. Some do it the right way by removing the fuse; apparently the previous owner of my truck took a different approach. Not sure they understood that the headlights didn't work. This was a city worktruck in Arizona so perhaps the headlights were never used.

Thanks for the help. This forum is one of the good ones!

Chuck

 
Low priced Genuine GM Auto Parts
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