Check the vehicle battery voltage, I've seen batteries that lose a cell and end up with a 10 V battery. This can scramble electronics.

This car might have a 2nd battery for the braking system, I'm not sure.

Many auto parts stores have a remote battery display and a tester for RF and IR remotes so it would be a good idea to see if the remote is consistent.

I'd think that there would be a way to scroll through dash error messages.