HAD a similar problem with my 97 dakota but I don't have a master lockout switch.
I took the passenger side switch apart. (Simple rocker switch just be careful when prying the side apart you don't break anything)
and cleaned the contact area good with a VERY fine sand paper and spray electric cleaner.
Think they get corroded by mist of rain when the windows are left down. (I do that a lot while driving and rain blows in)

That is something you could try if the master bypass thing don't work.

 

Don't need to get whole system changed, Just clean up the panel from inside, It will work