2021 Silverado radio turns on with key out

Jose Mechanic California Posted   Latest  
Resolved
Chassis
Electrical
2021 Chevrolet Silverado 1500 WT 5.3L (F L82 Gas) 6-spd (6L80) — 3GCNWAEF9MG290344
Battery Draw

Hello everyone, I'm looking for some help, I have a 2021 Silverado regular cab ,on which the radio turns back on after 2 minutes of exiting the vehicle(key out of ignition) with a message that says , rear controls unlocked upon vehicle re-entry, data pid shows door ajar switches active and inactive accordingly, I made the rookie mistake of deleting DTCs, swapped the radio with one from another vehicle but I was unable to program it. I have access to GM SI , but I'm having a hard time understanding the description of the radio power operation, I'm sorry if not explaining my self properly, Thanks in advanced for taking the time to help me out.

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Darren Owner/Technician
Arkansas
Darren
 

Hello Jose, Have you had the problem happen for you or just addressing a customer complaint? If it has also happened to you, and you confirmed the door switches are in fact working, take a careful look for add on devices and keep in mind they might be very well hidden. I have seen all to often where tracking devices would wake up several modules at random times and not let them go back to…

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Jose Mechanic
California
Jose
 

Hi Darren , this is … fleet pickup , as far I can tell there is no added devices , I noticed that the LIN stays active when the radio is on , when I remove the fuse for the radio the LIN goes to sleep, one question though, who is telling that radio to turn back on? thanks.

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Darren Owner/Technician
Arkansas
Darren
   

Jose, If that is a U-Haul fleet vehicle you can bet there is a tracking device (U-Haul has been under fire about purported vehicle thefts lately) The most likely place I have seen them is behind the radio. I just removed one this spring from a former fleet vehicle that a customer purchased a couple of years ago that decided to start doing the same thing. The device was about the size of a…

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Mark Engineer
Colorado
Mark
   

Jose If that is a U-Haul fleet vehicle you can bet there is a tracking device Several years ago a customer brought in a “retired” U-haul that kept draining the battery (he bought it a few years before then). After some diagnostics I found the “tracking device” with its own, small AGM (or gel) battery under the dash. The small AGM (or gel) battery was zip tied to a harness. When I checked that…

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Jon Owner/Technician
California
Jon
 

I agree with Darren - make sure there is not an aftermarket tracker somewhere. I have seen them under the dash, under the bed and in the headliner…. it could be anywhere-

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Darren Owner/Technician
Arkansas
Darren
 

I have found them under the seat and on late model GM trucks, above the spare tire carrier and tied into the rear harness master bulkhead (tail/brake/turn/BU lights, trailer towing etc. junction box typically aft of the spare tire cross member) I have even found them attached to the trailer towing harness and well hidden

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Jon Owner/Technician
California
Jon
 

I found this-

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Craig Owner/Technician
Michigan
Craig
 

Jose, This is a GLOBAL “A” vehicle and will not allow a radio swap from another vehicle. They are programmed for life to that VIN and only a new or properly remanufactured radio can be used!. what the others are saying may help you diagnose what is causing the “wake-up”. Put the original radio back, hopefully no damage has happened to the other modules when you incorrectly swapped the radio…

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Timothy Owner/Technician
Wisconsin
Timothy
 

As Craig stated, the radio is from a Global A vehicle, and as such the radio is not swappable. Google, “Do Not Swap Modules”, and the link to GM will show up. Read this to understand how Global A architecture operates. Hopefully other modules have not lost their ‘indentifiers’ by the process of trying to install a ‘used’ radio, when it cannot be swapped with salvage. The radio is turned on by…

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Jose Mechanic
California
Jose Resolution
 

Hello everyone, I was able to repair this pickup truck by replacing the radio, after poking around for what is seemed an eternity, I was able to trace the wake up message from the serial data gateway module ( circuit 1102 GY/GN on wiring diagram) to the radio, activity on this line would ceased after 1 min and a half, for some reason the radio was deciding to turn back on. I really appreciate…

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Darren Owner/Technician
Arkansas
Darren
 

Jose, Actually I am not surprised it was the radio as I have over the years had quite a few that would continue to draw power after key off. Last one was a 1995 Corsica last year that would drain the battery after a few days. As for turning the radio on in normal circumstances I'll go with a generic answer. In modern vehicles security features and greetings (entry lighting/chimes/warnings etc)…

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Eric Owner/Technician
Wisconsin
Eric
 

Here is a good place to start learning about Global A vehicles.

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