Welcome, I'm Chris (aka Moose) I'm an independent contractor here at Just Answer.
Quite often a dying battery damages modules, so keep that in mind that it may be the PRB power running board module on the back of the cab behind the rear seats to blame. Can you access this module and confirm its getting power and ground. black/yellow ground, blue/red power.
At the drivers running board. Back probe the connector on the blue/white and white wires. See if you get power and ground on these motor wires when the boards should be moving. If not then suspect the module if the door ajar sensors work and the message center will not move the boards when toggling between manual and auto mode.
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