1998 Seville STS

Lost power to all passenger doors for the door locks, power windows heated seat buttons in rear and door triggers and power mirror on passenger side. speakers still work and courtasy lights still work if you open the driver door strangly enough. Anybody have this problem or can guide me in a direction to start looking in. Oddly the rear doors only regained power for a brief period when i put people in the back seat there was power to the buttons but no functionality and the car thought the doors were open when they werent. BCM? Door modules? Bad Connection? Please help

Thanks
Dave