No need to dissassemble
Step 1: Toyota Prius Rear Door Switch - SUPER Easy Repair
Toyota Prius Rear Door Switch - Easy Repair. The handle of the Rear Door Switch is made of rubber. In a hot climate the rubber can melt and it gets sticky. In the end the switch will give up working. My fix is based on a thin flexible water proof moisture barrier. The six simple steps are explained in this video.