Jump to content

  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

2003 GMC Sierra No Brake Lights

jput2014
 Share

Recommended Posts

jput2014 New Member

jput2014

Posted
Posted

I am not sure if I am posting in the wrong place...so I am sorry if that's the case. I have a 2003 Sierra on which I had the heating coil replaced last month. A couple of days after the vehicle was returned to me I noticed that the cruise control stopped working. Last week my wife was following me home and noticed that I did not have any brake lights (all 3 brake lights not working, but signals and tail lights are fine). I checked all of the obvious things (fuses, pedal switch, and bulbs) and found that I had 12v on both sides of the fuse, but nothing at all in the switch plug. I found a schematic and realized that the only way this could happen is if the wire from the main fuse box to the switch has lost connection somewhere. So I traced the wire from the switch back and found that the mechanic who replaced my coil did not plug the brake switch back in. My problem is that I cannot find where it goes. For clarification, it is the wire that comes off of the switch on the brake pedal. It runs up behind the dash (I had to take most of the dash apart to find it), just under the top dash cover, and runs horizontally across the dash to about the center ofo the dash and stops. I have looked all over that area and many others but I cannot find anywhere for it to plug in to. I have looked for pictures online and cannot find anything. Please someone point me in the right direction here. Thanks for any help you can provide.

Link to comment
Share on other sites
gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

I am not sure if I am posting in the wrong place...so I am sorry if that's the case. I have a 2003 Sierra on which I had the heating coil replaced last month. A couple of days after the vehicle was returned to me I noticed that the cruise control stopped working. Last week my wife was following me home and noticed that I did not have any brake lights (all 3 brake lights not working, but signals and tail lights are fine). I checked all of the obvious things (fuses, pedal switch, and bulbs) and found that I had 12v on both sides of the fuse, but nothing at all in the switch plug. I found a schematic and realized that the only way this could happen is if the wire from the main fuse box to the switch has lost connection somewhere. So I traced the wire from the switch back and found that the mechanic who replaced my coil did not plug the brake switch back in. My problem is that I cannot find where it goes. For clarification, it is the wire that comes off of the switch on the brake pedal. It runs up behind the dash (I had to take most of the dash apart to find it), just under the top dash cover, and runs horizontally across the dash to about the center ofo the dash and stops. I have looked all over that area and many others but I cannot find anywhere for it to plug in to. I have looked for pictures online and cannot find anything. Please someone point me in the right direction here. Thanks for any help you can provide.

You take it back to him , it's called a "comeback" not your problem

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
 Share
Go to topic listing

  • Similar Content

    • Disposable
      2017 Silverado Low Voltage on 7 pin and 4 pin for trailer hook up.
      By Disposable
      Any help before I have to leave the truck at the dealer for a few days would be great. 
      2017 Silverado
      Dual 7 pin and 4 pin connector
      Test the 7 pin :  8 volts when grounded to the wiring harness
      Test the 4 pin : 7-8 volts when grounded to the wiring hardness
      Test the 7 pin :  8 volts when grounded to the Frame
      Test the 4 pin : 7-8 volts when grounded to the Frame
       
      7-8 Volts on when testing at the fuse panel  under the hood. Grounded to the engine block. 
      Relay seems good, all 4 fuses are good.  Other Fuses like lights, radio and wipers all bring back 12v range. 
       
      I am not sure where to go from here. I don't want to miss a ground wire or something. 
      I did clean and re-attach the ground wire next to the brake controller under the rear of the truck. 
       
      Thanks, 
       
       
    • LD85
      Horn issue: Need help with horn button switch- need to fix/ replace
      By LD85
      Hey, 
       
      I have a 2018 GMC Sierra 1500 5.3 L. A few weeks ago I slammed on my horn too hard and the horn wouldn't stop until I took the fuse out. If I put the fuse back in, the horn blows continuously so I have taken the fuse back out but now I can't use the horn. I would like to try and fix the issue myself instead of bringing it into a dealership but can't find any videos or tutorials on how to fix the horn button switch which I think is the issue. 
       
      If anyone has any feedback, please I'd appreciate something because I am not having much luck on my end.
       
      Thanks,
    • Nathan Gwin
      Adding Bumper Reverse Lights
      By Nathan Gwin
      First time posting on here, I’ve tried Facebook for answer and have gotten nowhere. 
       
      I have seen all of the cargo/reverse light mods and can’t seem to find what I’m looking for. 
       
      I am wanting to add a set of reverse bumper lights to my truck, my problem that I’m trying to figure out is I want to either add a switch on my dash or use the existing cargo lamp switch to power them. I am only wanting my reverse lights to come on when I put my truck in reverse or turn the cargo light switch on but when I put my truck in reverse I do NOT want my cargo lights to come on. I want to be able to use my bumper lights anytime I please no matter if I’m parked or driving down the road but I also don’t want my tail light reverse lights to be on when I turn the switch on. Only when I put my truck in reverse do I want the factory reverse lights on, I don’t want them to be on if I’m driving down the road. I also don’t want my truck to display the R on the dash if I’m driving down the road and I turn them on. 
       
      I figure I’m gonna need a couple of relays and diode or two but I not exactly sure what I will need or how to add them all to the truck and it function how I want it. 
       
      I want to be able to add a switch into the bed for the bed lights as well so I need the cargo/bed light switch that I add to work with this setup I’m wanting to add. 
       
       
    • Henry L
      low voltage at trailer plug
      By Henry L
      2020 Silverado 2500, have taken this truck to two different GM dealers and they cannot find an issue. At the at the 7-pin plug when the manual gain is depressed at 100%, it only puts out 7 volts. Need 12 to lock up brakes. Cannot properly set up my gain when hooked to trailer before towing. Dealership has replaced fuse block brake controller and I had them change out the plug on the bumper. Still the same. At neither dealership have they been able to give me voltage going in the controller and coming out. One even said they can't put a volt meter on it. I believe it's a wire somewhere. But due to my health issues I cannot physically work on my truck. I'm probably going to end up taking it to an auto electrician. Any thoughts!
    • BoyBlue22
      First post - First Mod!
      By BoyBlue22
      Hey all!  I'm the proud owner of our 1st brand-new vehicle ever! this '22 Silverado HD High County is a game-changer for pulling our new camper trailer! I recently retired and found this beauty on a dealer lot near me!
       
      So... as per usual with my vehicles, I really enjoy there look of nice clean, glossy calipers peaking from behind the rims!  These wheels are not as open-spoked as others I've done, but still look great, especially when they turning miles not the highway!  I always use the brush-on G2 caliper paint.  The stuff is incredible! Here's a couple pictures in process and afterwards...
       
      Carl



  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    242k
    Total Topics
    1.4m
    Total Posts

  • Member Statistics

    308,972
    Total Members
    8,960
    Most Online
    Douglas Scott
    Newest Member
    Douglas Scott
    Joined


×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.

  I accept