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Noise behind instrument cluster after shutting down

noise behind instrument cluster after shutting down
I’d be curious to find out if anyone else has this happening also, my wife says her TB makes a bunch of clickety click noises a few minutes after shutting off.
I sat in it yesterday for 10 minutes after shut down and didn’t hear anything 🤷‍♂️
 
I've actually heard it too happens fairly often but haven't got a clue what it is haha.
 
I verified the clicking noise today while sitting in the pass seat after shut down, definitely sounds like relays as @Remanaz stated.. sounded to me like it was fwd of the firewall over on the drivers side possibly in the area of the ABS system.
Found this statement from a user on a GM forum:

“It is the new electronic braking system doing a system check. It does this after the truck has been shut off. I worked on it while it was in development”
 

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