2008 Yukon electrical issue

[crturner24]

I bought a 2008 yukon SLT yesterday and was driving today and noticed that the touchscreen would shutdown and then start right back up again. And i was driving tonight and noticed that every so often the headlights would flicker. Then i shut off the vehicle and as soon as i took the key out, the car completely died. Car wouldn't choke, no lights, nothing. The key wouldn't unlock, lock, or remote start, it was completely dead. I came outside 20 minutes later and it was back to new. The truck does have 171k miles but is in impeccable shape. Any info y'all could give me would be much appreciated.

 

Thanks

[02suburbanZ71]

In the morning i can post some wiring diagrams for you, and some diagnostic info. I would highly recommend going to the dealer and having them perform a scan

[02suburbanZ71]

my 2 guesses are BCM or ground. have dealer scan. here are some files that could help diagnose it.

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[seminole]

I have a similar issue in that our doors unlock sometimes and sometimes they won't. Sometimes the cruise control works and sometimes it doesn't. Any ideas or do you think it's related to the above issue?