Odd Bose radio issues. No sound when cold. Randomly powers off for a few seconds. Occasional theftlock briefly then works fine.

[2018GMC]

 

 I have a 2003 suburban z71 with factory 6 disc in dash cd receiver. When it’s colder than 50 degrees the radio powers on but now sound or door chime until the cabin warms up. Summer months it works fine. Cold months nothing the you hear a pop and you get sound.

I’ve tried replacing the Bose amp (under the center console) pulled from a junkyard Tahoe of same vintage. Still same issue.

Also tried reflowing solider in the main circuit board on the radio receiver and my original amp.

Still no change has the no sound when cold. The random theftlock seems new but it self heals and goes away within a few seconds. Only happens very rarely. The random radio powering off then on is new.

Anyone else experience this? Is there a known wiring harness issue under dash or center console?

My burb has the sunroof, maybe in the past 20 years someone left it open and it rained? Although switching out the Bose amp didn’t seem to fix anything.

Also get codes

Radio DTCs
U1000 Class 2 Data Link Malfunction
U1016 Lost Communication with Powertrain Control Module
U1151 Loss of VIU Communications
U1167 Lost Communications with Rear Seat Audio/Rear HVAC

BCM DTCs
U1000 Class 2 Data Link Malfunction

[2018GMC]