01 yukon xl security light issues

[dl117]

Hey new here, searched a little and could not find exact issue so here it goes.

I have an 01 yukon xl that battery went dead a couple weeks ago, changed it no problem, 2 days later wife could not start, cable was loose, neighbor tightened and doors locked, since then security light has been on and draining battery. It starts and runs, but no daytime running lights, but when I turn on switch I have all exterior lights except headlights. I also have no interior lights or keyless entry. I am getting frustrated, the positive thing is it is a 3rd vehical for us, but I sure would like to get this to work.
Maybe a key switch?, BCM? My understanding is that the security shuts down fuel also, but that is not a problem.

Any help would be greatly appreciated, thanks very much.

 

[01TX_Tahoe]

Have you tried disconnecting the battery again for about 5-10 minutes? That should reset the BCM. Maybe the loose cable caused a short or something. Just be sure to tighten 'em back up though.

 

[dl117]

I have tried that a few times, replaced the BCM with a salvage yard one, and everything is the same, I am going to take it in to the dealer and have it scanned and see what the hell is going on. The battery only lasts 2 days and still no headlights or interior. Very frustrating.

 

[SLCHOE]

Sounds like there may be a module staying awake after key off. Odd question but does your rear wiper/squirter work?

 

[rockenthebowtie]

Does it have an aftermarket alarm system on it

 

[dl117]

Got it figured out, it was not getting power to the BCM, bad wire and blown fuse, fuse did not even look blown, had to test to figure out. Thanks for the suggestions.