Jump to content

2009 Silverado No Backup Lights

ChevMech
 Share

Recommended Posts

ChevMech Enthusiast

ChevMech

Posted
Posted

Okay guys, It's been a long time since I've posted, but I'm having a little bit of a problem. My 2009 2500HD gas has no back-up light. None, nada, zip....nothing. I have run a hot wire to the fuse and they light up, so i know the wiring to the back and the bulbs and sockets are working. They don't, however, turn on when you put the truck into reverse, or when the rest of the perimeter lighting is engaged. I also have nothing on the trailer circuit. 

 

Besides running that jumper wire, I have done nothing but check the fuses, and despite what the google machine says, there is no relay on this one.  Is there a common failure on these trucks that would cause this problem?

Formulabruce Enthusiast

Formulabruce

Posted
Posted

Ok , Underhood in the big Fuse box power block there should be a few marked for trailer lights. I am thinking one of these fuses is blown. Also could have a switch on the Transmission that is bad.. Good luck!

ChevMech Enthusiast

ChevMech

Posted
  • Author
Posted

This is going to be my project for this weekend, so I'm going to take a tester to everything that may or may not be related to the backup light circuit.


My next question, where is the back-up light switch located on the transmission? I'm not seeing a switch designed for this function on any parts websites. A Google search shows two thing: either one that threads in, or the neutral safety switch.

  • 2 weeks later...
davester Senior Enthusiast

davester

Posted
Posted

check all the fuses, both in the underhood fusebox and the one in the drivers end of the dash.  I've had another, unrelated fuse blow (but offhand, I don't recall the specific one) because of a wiring problem, and that resulted in the backup lights not working.

citydriver Enthusiast

citydriver

Posted
Posted

There is a relay, but it's not serviceable, it's a PCB relay mounted to the board inside the under hood fuse block that is triggered by the BCM after it receives a signal from the transmission control module.  But I would check the fuse and the fuse socket / connections. I have been noticing some corrosion on my under hood fuse block connections lately. On both sides, the top you can see and the underside that you can't see. I basically removed the under hood fuse block to clean and inspect ALL of the connections for the fuses, relays and harness connectors under the block, then used a plastic bristled brush and applied a thin coat of di electric grease to all of the contacts. I did this as a preventative measure to help keep the corrosion from getting out of control. Hopefully that's all you will find is a dirty connection. Otherwise you will need a Tech2 or similar to check the signals from the modules.

  • 2 weeks later...
ChevMech Enthusiast

ChevMech

Posted
  • Author
Posted (edited)

So let’s say it is the relay, what’s the next step?

Edited by ChevMech
  • 3 weeks later...
ChevMech Enthusiast

ChevMech

Posted
  • Author
Posted

Just a quick update: I found the problem with my faulty reverse lights: the relay under the fuse panel is blown. I borrowed the fuse panel out of my parents' Tahoe and everything worked as it should. 

 

While I was looking for a replacement (let me know if you have one) I found that this is a really really really common problem on GM trucks of this generation. I read that the ground strap from the firewall to the engine cracks/breaks causing power surges of sorts. The most obvious of symptoms: the relay for the backup lights fails. The solution: replace the strap or add a ground wire.

 

For what it's worth, I'm thinking adding the wire will fix the blinking the headlights do when I hit a bump too hard.

  • 1 year later...
Sparksalot Enthusiast

Sparksalot

Posted
Posted

I'm glad I found this thread.  I was convinced the de-commissioning process for my PPV disabled the reverse lights.  I had none at all, then one day the were on continuously.   I replace the underhood fuse block, which replaced the reverse relay too.  That did the trick.  GM calls it a "junction block"

GM 22798217 Engine Wiring Harness Junction Block

  • 2 years later...
Colton Christman New Member

Colton Christman

Posted
Posted
On 4/6/2019 at 10:29 PM, Sparksalot said:

I'm glad I found this thread.  I was convinced the de-commissioning process for my PPV disabled the reverse lights.  I had none at all, then one day the were on continuously.   I replace the underhood fuse block, which replaced the reverse relay too.  That did the trick.  GM calls it a "junction block”

did you have to have yours programmed by the dealer? My 2014 ppv has this same issue, and I can get the junction box brand new from a gm parts supplier but it states it must be programmed. Just trying to see if this is true or not

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • Grumpy Bear
      Gas Prices

      By Grumpy Bear · Posted

      If we actually used any significant amount of that source in the USA then I'd agree but we don't. We've had that discussion before. We drill and pump more than we use. Thing is, we sell. We export. Gas and Crude. It's more profitable so any shortage here is self inflicted and LEGAL.    I worked a gas plant that has multiple fuel sources available and I worked in the furnace and boiler plant in that facility. I'd had days we swapped fuel types four times in a twelve hour shift which isn't done on supply but on margin. Two of the fuel sources are internally generated. Tail gas and DAK, both of which are sold as well a consumed. We always had more than we needed to run the process but we chose the fuel that produced the best margin not bought at the cheapest price always. A good bit of math to that and back in the time that was done on a slide rule.     I worked the Shale Oil Semiworks of Chevron Research and CONOCO Research in Salt Lake City. That process never went into production although it was very successful. Why? Did we lack oil bearing shale? Nope. Price of crude never made the margins work. That was in the late 70's early 80's. Remember history? What was happening then was a reaction to that situation. It didn't drive it. If so then it's easy. This isn't a supply and demand thing. This is a profit and margin thing and AI rules that now.    In no refining situation that I was ever in would a bomb hitting a well anywhere in the world 'instantly' interrupt or even distress the supply. Most plants have more than a months worth of crude in the tank field and more in pumping stations. That yo-yo could play out over days, weeks and maybe months and have zero impact on plant operations. How many times has this been off and on in the last few months? These people and not stupid. These plants measure down time in hundreds of thousands of dollars per day. They are not sucking fumes or waiting on the next truckload with baited breath. Besides, as I noted, they are for the most part 'vertically integrated'. They own it from the dirt is sits in to the delivery rack and sometimes to the pump. It has a HUGE shock absorber built in. When production suffers, refining wins and when refining is winning exploration is killing. The rest of that crap in the news is a 'news cycle'. Government dipping in to reserves? Oil is stealing their milk money. There's a reason Chevron abandon Venezuela infrastructure and it had nothing to do with security of US citizens. Nationals run those plants. it has to do with MARGINS disappearing to corruption. They are in no hurry to return. Is there supply there? Oh yea. More than enough to offset what is bought in the middle east. Just isn't ???? Profitable.    We have supply. There are places in Illinois you can drive a pipe into the ground and run your homes natural gas furnace on it.    A refinery fire will gum up the supply works but not a localized war where the market is using a limited supply from. Now Europe, that's something other....
    • CamGTP
      Gas Prices

      By CamGTP · Posted

      $4.00 a gallon here now.   Diesel nearly $5.00 again.
    • Atlas
      Gas Prices

      By Atlas · Posted

      If we're talking futures, yes, it's speculation.   The spot price of a delivered barrel is elevated now compared to before the conflict. And that is related more to current supply/demand.
    • Grumpy Bear
      Gas Prices

      By Grumpy Bear · Posted

      SPECULATION on the wars effect raised prices. AI is maximizing the profit. Refining is vertically integrated. 
    • Atlas
      Gas Prices

      By Atlas · Posted

      It's the Middle East conflict that raised prices, not AI. But nice distraction.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...