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Factory Backup Camera Wiring Help Needed

codyrudd

By codyrudd
in Ask A GM Technician

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codyrudd Enthusiast

codyrudd

Posted
Posted

I am trying to figure out where the signal comes from on the factory backup camera to trun on. I have a 2010 sierra with the display in the mirror. I am trying to wire in a switch to over ride and turn it on when I want such as when Im driving down the road. Any one know much about this feature and how it works?

old-chevy-dude Senior Enthusiast

old-chevy-dude

Posted
Posted

it comes from the BCM,

 

it is the blue wire in the upper left grey connector.

 

 

i'm linking the pac-audio pdf for their camera/nav in-motion over-ride, they tap that blue wire to turn on the camera while moving forward: (page #2 figures A,B,C), what you want to do is cut the line and provide the power to the side going to the back of the truck and cap off the part going into the connector, if you put power on both sides you will blow the BCM..

 

the blue wire is the reverse trigger @ the camera.. the problem you will encounter is that you will have to manually turn on the camera even in reverse, if you provide power to the BCM side of the wire you will have issues with the auto dim feature and the onstar.

 

http://www.pac-audio.com/PACProductData/NU...ions_092309.pdf

codyrudd Enthusiast

codyrudd

Posted
  • Author
Posted

Why would it cause the BCM to burn up? If i wire in a toggle switch to the blue wire with an aux 12vdc and leave it off, then the camera should function normally, right? if I only turn the switch on when Im not in reverse, wouldnt I be safe? Oh by the way, I looked at the specs for the nu gm29 module and I dont know if that will work. I dont have the nav unit. My camera screen in in the rearview mirror.

old-chevy-dude Senior Enthusiast

old-chevy-dude

Posted
Posted
Why would it cause the BCM to burn up? If i wire in a toggle switch to the blue wire with an aux 12vdc and leave it off, then the camera should function normally, right? if I only turn the switch on when Im not in reverse, wouldnt I be safe? Oh by the way, I looked at the specs for the nu gm29 module and I dont know if that will work. I dont have the nav unit. My camera screen in in the rearview mirror.

 

 

power from that line goes one direction from the BCM to the camera, flowing it the other way could short the BCM, when I installed my pac unit I spliced into the line because that is what the instructions say, and I lost all power to the auto dim mirror, park assist, electric pedals, memory seats, power driver and passenger seats, cruise control, HVAC, power locks, etc..

 

I called PAC and they said I had to cut the line and only provide the power to the side going to the camera and cap off the BCM side. their unit picks up the reverse signal sent to the nav unit and turns on the camera via their connection.

 

 

and as far as it being in the mirror, should not make a difference, according to the Electrical Manual the wiring is the same at the BCM, the difference is not the camera power but the mirror connections.

 

the camera itself is not powered unless the truck is in reverse, so you have to supply a 12 volt trigger on that blue line to power the camera. you may also need to provide power to the mirror LCD to get it to turn on.

codyrudd Enthusiast

codyrudd

Posted
  • Author
Posted

Ok that makes sense. But.. in theory, I should be able to wire in a diode between the BCM and where I put a splice, thus preventing power from going back into the BCM. Im just trying to figure out a simple way to turn on my camera with out spending $300 for that unit from PAC. By the way, I really appreciate the info. you have shown me much more than I have been able to find online for weeks.

beave84 Enthusiast

beave84

Posted
Posted

I'd stick with the Pac unit that old-chevy-dude,love the name, used just for the fact that if you have an warranty problem then they can't say that you hacked the wires up and what not to get outta the warranty. That 10/100 warranty would suck to lose for a camara.. just my 2 cents.

old-chevy-dude Senior Enthusiast

old-chevy-dude

Posted
Posted
Ok that makes sense. But.. in theory, I should be able to wire in a diode between the BCM and where I put a splice, thus preventing power from going back into the BCM. Im just trying to figure out a simple way to turn on my camera with out spending $300 for that unit from PAC. By the way, I really appreciate the info. you have shown me much more than I have been able to find online for weeks.

 

 

no worries, and yes a diode would prevent the feedback..

 

pm me with an email addy and I'll send you a copy of the wiring/electrical part of the service manual, hopefully it will assist you.. as far as the PAC thing, I think that only works for the nav, my reference to it was for the wiring to the camera nothing more.

codyrudd Enthusiast

codyrudd

Posted
  • Author
Posted

Got it thanks, I will take a look and see what I can come up with. I would assume 09 is the same as 2010? These prints are nothing like the aviation schematics I am used to.

  • 5 months later...
adventureboy New Member

adventureboy

Posted
Posted
Ok that makes sense. But.. in theory, I should be able to wire in a diode between the BCM and where I put a splice, thus preventing power from going back into the BCM. Im just trying to figure out a simple way to turn on my camera with out spending $300 for that unit from PAC. By the way, I really appreciate the info. you have shown me much more than I have been able to find online for weeks.

 

 

no worries, and yes a diode would prevent the feedback..

 

pm me with an email addy and I'll send you a copy of the wiring/electrical part of the service manual, hopefully it will assist you.. as far as the PAC thing, I think that only works for the nav, my reference to it was for the wiring to the camera nothing more.

 

 

 

 

I would suggest a simpler solution - Use a SPDT switch to switch between the BCM output and a live output to the camera. That would give you 3 positions - Backup, Off, On without back feeding the BCM. The SPDT switch has 3 terminals on the back. Centrer terminal goes to camera, other two go to BCM and live respectively. This is less risky and probably cheaper than a diode solution. :lol:

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