Upfitter Switch BCM and LCM Wiring

[JaredW]

I'm finishing up my Upfitter Switch install and am looking for those who tapped the BCM and LCM for the missing pins instead of just providing 12v to all 3 pins.

Our trucks are missing pins 3,11, and 13 on the truck side and I don't want to just put 12v to all 3 because I want to be able to dim the backlights with the rest of my interior.

I know I need to get into BCM connector 4 and 5, as well as the LCM connector 5. I'd just like to confirm which connectors those are.

 

[GATORB8]

Probably way more info than you are looking for, but here's the bodybuilder electrical manual that should have the info in it.

https://www.gmupfitter.com/wp-content/uploads/2024/08/081324-25-Silverado-2500-3500HD-Electrical-Body-Builder-Manual-SM_en_US.pdf

 

[JaredW]

Probably way more info than you are looking for, but here's the bodybuilder electrical manual that should have the info in it.

https://www.gmupfitter.com/wp-content/uploads/2024/08/081324-25-Silverado-2500-3500HD-Electrical-Body-Builder-Manual-SM_en_US.pdf

Mine's a 1500, but I did use that for mine. Thanks for the link, hopefully anyone doing the same thing with a 2500 can use this too!

I just wanted to confirm which connector on the BCM is #4 and #5

 

[ZR2xBIZON]

Following

 

[JaredW]

I think I figured it out. I got the GM color guide to their abbreviations so I can make sure I'm on the right connector. I'll try and take some pictures tonight and update if it works.

 

[JaredW]

Probably way more info than you are looking for, but here's the bodybuilder electrical manual that should have the info in it.

https://www.gmupfitter.com/wp-content/uploads/2024/08/081324-25-Silverado-2500-3500HD-Electrical-Body-Builder-Manual-SM_en_US.pdf

Do you happen to know which wire is the lead for switch 5? I'm not running anything to the roof so I'd like to pull it so it can be used if need be.

 

[GATORB8]

Do you happen to know which wire is the lead for switch 5? I'm not running anything to the roof so I'd like to pull it so it can be used if need be.

It looks like it's Violet/Blue pin 8 out of the Aux block:

 

[JaredW]

It looks like it's Violet/Blue pin 8 out of the Aux block:

Okay perfect, that's what I was thinking it was too.