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I'm trying to wire up the reverse lights on my 2015 style tow mirrors. Does anyone know which wire the reverse lights are in the bcm under the steering wheel? I don't have access to a circuit tester. On a 2001 Sierra
 

· Supr Moderator AutoTech SS-Guru Mbr Extraordinaire
2015 High Country Duramax
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Yeah that's odd it's not setup the same as mine.

You could take a multimeter and test the other wires and see if one is hot only in reverse. If not, then you may have to grab the reverse wire coming out of the bcm.

And for that I'd have to look up a pinout of the bcm connectors. There are several other ways to do it as well. But the bcm and the junction box are the easiest in my opinion since they are right there.
 
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