Stereo powered up after they unlocked it and closed the doors

[Denalidude10]

The ole lady went to go to soccer and they unlocked her 2014 Yukon Denali XL and pressed unlock then jumped in closed the doors and the stereo turned on and was playing music. Previously in town the battery died at drive in car wash we used a booster pack got it running. What would cause the stereo to power up before she even put the keys in ignition is my question?

 

[petethepug]

Bad battery and / or low voltage makes the BCM go wonky.

Remove battery, charge w/ slow charger overnight and take to parts house specifically for a Load Check.

Replace battery if needed. Strictly based on the age of the vehicle it’s time to replace the -/+ battery cables.