my seats dosn't work any more, when i raise them up, only one side goes,

The drive cables have stretched and are no longer engaging the driven gear, usually on the "work" side of the cable. I've had good results by merely shortening the shield part of the drive cables and re-inserting the cable like that. It's always easier to fully remove the seat from the vehicle before starting to disassemble the carriage assembly, but remember to match up the drive assemblies to their individual functions while the seat is still hooked up to vehicles battery.