CHMSL (third brake light) wire location?

[UpNorthZR2]

Need help finding where I can tap the wire for the Chmsl for my sportbar. My 2020 wired into the fuse block under the hood, the 2022 refresh models have a 10 amp fuse for this (#53) on the fuse block but has no power to it. I’m guessing the wire maybe under the dash, but wondered if anyone knew where this is? The guys wiring toppers out there probably have run into this. I noticed a recall from GM(recall#N222368110) for factory installed sportbar for Chmsl problems. Any help would be appreciated!

 

[wutang61]

I’ll contact ALLDATA tomorrow and see if I can get more information. 22.5+ is still slim pickings

 

[UpNorthZR2]

That would be great! From the research I’ve done, it’s either at the bcm on the driver side, or the connector under the glove box that connects wiring that goes to the headliner. Thanks for checking this out-I think it may help others down the road!

 

[UpNorthZR2]

I’ll contact ALLDATA tomorrow and see if I can get more information. 22.5+ is still slim pickings

I can confirm that the CHMSL wire is Brown/Yellow. It runs from the BCM to the pass side under the glovebox and up the pass side pillar if anyone is looking for it! Thanks again for the schematic-it narrowed down the wire colors!