Factory Running Board LED lights
- Thread starter skw774
- Start date
There is fun frustrating thing I figured out with the GM upfitter diagrams. If they feed two same color wires into the same Pin location on a connector, Ex- BCM X2 pin 5 has two VT/GN wires the Diagram lists only 1 wire( two different colors are always listed on the same Pin). One feeds the puddle lamp under the mirror and the other feeds the electric step lights.
On 2020+ 1500s and 2024+ HDs the BCMs are different.
Look at the K219 Lighting Control modules - X5 Pin 1 or Pin 4?
-Puddle lamp control
- exterior Courtesy lamp control
-Front footwell accent lighting
Then you can unplug the 2 wire connector feeding the step lights and use a wire tracer, power probe, or continuity test with a multimeter to confirm the control wire.
Last edited:
joegolden
Member
Thanks for the info, now to get my big head under the dash to find all of this, plus I messed up my shoulder so it is harder to twist under there.
So there's guy on a different forum that figured out how to trigger an aftermarket LED strip using a pinout from the BCM:
Project Running Board Lights Is A Success
Project I have been working on. Just had to figure out the refresh BCM. The black BCM module closest to the firewall has pin #1 open for adding accessory lights. I used a set of 60" MICTUNING cargo led strips. The black connector is a pain to get out. It is in close quarters to the firewall and h...
www.gm-trucks.com
Wonder if you'd just be able to jumper from the pin in the thread above to the trigger wire for the factory strip (and use a diode to prevent voltage feedback)....?
Welcome.So there's guy on a different forum that figured out how to trigger an aftermarket LED strip using a pinout from the BCM:
Project Running Board Lights Is A Success
Project I have been working on. Just had to figure out the refresh BCM. The black BCM module closest to the firewall has pin #1 open for adding accessory lights. I used a set of 60" MICTUNING cargo led strips. The black connector is a pain to get out. It is in close quarters to the firewall and h...
Wonder if you'd just be able to jumper from the pin in the thread above to the trigger wire for the factory strip (and use a diode to prevent voltage feedback)....?
lol! Thanks! I've been wanting to figure out how to do this on my truck and I just stumbled across the other thread, which lead me down a rabbit hole lol! Saw this thread and decided to join and post to see if anyone is ambitious enough to try it... I'm guessing it's totally doable as I think diode jumpers is what shops like Boost Auto use to let you trigger the rest of the factory lighting on these trucks...
What is in that other forum does work. I ran a wire off that to a coupe of small 3/4” leds as well as to trigger a relay(it’s diode isolated as well to prevent feedback).
My relay source power at the knee bolster fuse panel and I have two output wires, one run to each board and tied into the led wiring. I could not find inside where to trigger the running board leds so I just ran all the way to each board for now. I may poke around a little more and see if I can find a trigger inside for the board lights.
But now my boards work just like the dome lights except for the fade in - fade out, due to them being off the relay.
Awesome! So safe to assume that pin is just a straight 12 volt output?
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