Pin Layout

[mshell56118]

Does anyone have a diagram that shows what each pin does that is under the dash I already know the brake connector

I am actually looking for the pin layout for the one marked upfitter

[GM-Tech]

Make/model/year? I'm not familiar with an upfitter option, but I'll let you know once I know what kind of vehicle this is.

[mshell56118]

2003 silverado 4x4 1500

 

according to the sicker on the electrical panel under the drivers side dash where you connect the brake controller harness in

 

if you look at the marking inside the panel you remove it marks one of the plugs as upfitter or something close it is either the one next to the brake controller or the second one over

[GM-Tech]

I can find little to no information on that connection. From the picture, and the fact that no connector is listed for that spot, it appears there is nothing connected to it. The backside is probably left open for the upfitter to hook in whatever they want.

 

I'd take a test light, turn the key on and test all the connections for power. If you have none, then hook the test light to power and check for ground. Otherwise, pull the block off and look at the backside.