2003 GMC Sierra, Passenger Door Electronics dead

Anyone know what cause the passenger door electronics to go dead this would include

door lock door lock switch power window remote power mirror on passenger side as well does not work heated seat

I checked the inside door and pulled plugs out and put them back in and are seem very good for connections.

Also the wierd thing is also the remote used to lock and unlock doors does not work.

Everything on drivers door works fine though such as locks and power windows for the other doors but the passenger windows does not work, and when you lock and unlock doors on driver side the passenger door does not lock or unlock.

Anyone have any thought as what it could be, passed warranty period on truck mileage wise so would like find if it as as could fix or replace the failed piece myself.

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cds
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