1998 GMC Sierra Lighting Problem - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


GMC/Chevrolet Truck/SUV When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 02-05-2015, 03:34 PM   #1
Junior Member
Thread Starter
 
Join Date: Feb 2015
Posts: 6
Thanks: 0
Thanked 2 Times in 1 Post
klym is on a distinguished road
Default 1998 GMC Sierra Lighting Problem

I have a strange set of lighting issues I can't figure out.
First one: Daytime running lights come on when truck is started. They remain on when parking lights are turned on. Switch to headlights and they go out. No low beams. High beams work.

Second one: Front turn indicators aren't consistent. Sometimes the front and side lights blink in sync, sometimes they alternate.

Third one: This one is weird. Reverse lights are doing their own thing:
Right turn signal on: both reverse lights blink
Left turn signal on: no reverse lights on
Gear selector in reverse: middle light and reverse lights on both sides
Gear selector in park, step on brakes: middle light and reverse lights on both sides

I have pulled out and verified the wires for the tail light assembly that runs by the back bumper, and removed the ground by the spare tire and cleaned it up and fastened it with no change.

Can anyone please give me some idea of what is going on?
klym is offline   Reply With Quote
Old 02-05-2015, 05:22 PM   #2
Senior Member
True Car Nut
 
jwfirebird's Avatar
 
Join Date: Dec 2009
Location: western,ny state
Posts: 9,616
Thanked 563 Times in 481 Posts
jwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond repute
Default

the housings on the 88-98s there is a circuit board there that can cause the signals to cross as they go out, check it out they are sometimes pretty obviously corroded and i think they have dorman help boards at the parts store now, though they didnt when i needed them i had to buy whole ones. might be ten years ago though
jwfirebird is offline   Reply With Quote
The Following User Says Thank You to jwfirebird For This Useful Post:
WilliamE (02-07-2015)
Old 02-05-2015, 07:08 PM   #3
Junior Member
Thread Starter
 
Join Date: Feb 2015
Posts: 6
Thanks: 0
Thanked 2 Times in 1 Post
klym is on a distinguished road
Default

You were right about the circuit boards. I bought a set and replaced them, which fixed that problem (3). Next major one is the headlight issue.
klym is offline   Reply With Quote
Old 02-06-2015, 12:24 AM   #4
Junior Member
Thread Starter
 
Join Date: Feb 2015
Posts: 6
Thanks: 0
Thanked 2 Times in 1 Post
klym is on a distinguished road
Default

Changed out the headlight switch and no change. Low beams still cut out when turning the switch from parking lights to running lights.
klym is offline   Reply With Quote
Old 02-06-2015, 08:32 AM   #5
Senior Member
True Car Nut
 
jwfirebird's Avatar
 
Join Date: Dec 2009
Location: western,ny state
Posts: 9,616
Thanked 563 Times in 481 Posts
jwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond repute
Default

so you have drl and high but no low? check to see with a meter if the low socket has power and good ground?
jwfirebird is offline   Reply With Quote
Old 02-06-2015, 09:43 AM   #6
Junior Member
Thread Starter
 
Join Date: Feb 2015
Posts: 6
Thanks: 0
Thanked 2 Times in 1 Post
klym is on a distinguished road
Default

I tested the dimmer switch using this proceedure: Part 2 -How to Test the Low-High Beam Headlight Dimmer Switch , and the headlight switch using this one: Part 1 -How to Test the Headlight Switch (GM 4.3L, 5.0L, 5.7L) . Both tests passed, but I replaced the headlight switch anyway. I got the low beams to come on by slowly turning the headlight switch to running lights a few times, but they went out a few minutes later. I am thinking it might be the DRL relay.
klym is offline   Reply With Quote
Old 02-06-2015, 07:50 PM   #7
Junior Member
Thread Starter
 
Join Date: Feb 2015
Posts: 6
Thanks: 0
Thanked 2 Times in 1 Post
klym is on a distinguished road
Default

Replaced the DRL relay down by your left foot (not the diode brick near the center of the dash). Low beams are working so far.
klym is offline   Reply With Quote
The Following 2 Users Say Thank You to klym For This Useful Post:
jwfirebird (02-07-2015), WilliamE (02-07-2015)
Old 02-07-2015, 07:43 PM   #8
Senior Member

True Car Nut
 
WilliamE's Avatar
 
Join Date: Jun 2011
Location: VA
Posts: 3,087
Thanked 418 Times in 376 Posts
WilliamE has a reputation beyond reputeWilliamE has a reputation beyond reputeWilliamE has a reputation beyond reputeWilliamE has a reputation beyond reputeWilliamE has a reputation beyond reputeWilliamE has a reputation beyond reputeWilliamE has a reputation beyond reputeWilliamE has a reputation beyond reputeWilliamE has a reputation beyond reputeWilliamE has a reputation beyond reputeWilliamE has a reputation beyond repute
Default

Thanks for following up and letting us know what seemed to fix your issues, if there are any changes let up know.
WilliamE is offline   Reply With Quote
Old 02-07-2015, 07:47 PM   #9
Junior Member
Thread Starter
 
Join Date: Feb 2015
Posts: 6
Thanks: 0
Thanked 2 Times in 1 Post
klym is on a distinguished road
Default

Will do. Hopefully this will help someone else to not bang their head against the wall as much as I did.
klym is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1998 Silverado Rear Tail Lighting Problem truck1998 GMC/Chevrolet Truck/SUV 7 04-24-2014 01:47 PM
2006 GMC Sierra ABS Locking problem Zolo GMC/Chevrolet Truck/SUV 8 04-23-2014 07:55 AM
Problem with 2000 GMC sierra 1500 rearend nightriderr GMC/Chevrolet Truck/SUV 4 11-10-2011 08:17 AM
97 GMC Sierra starting problem bluepen2 GMC/Chevrolet Truck/SUV 4 06-27-2011 11:37 PM
2000 GMC sierra problem. nightriderr GMC/Chevrolet Truck/SUV 5 10-22-2010 08:44 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 09:11 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.