Just bought a 2005 4Runner and all the lights work except the passenger side back-up light. I tried replacing the bulb, but that wasn't it and the fuse must be OK as all the other lights work. I tried pulling the small contact points on the bulb socket out a little to see if they weren't making proper contact, but that didn't help. Just wondering if that removable bulb socket could be the issue (I should check using the driver's side one), or if it is with the housing contacts or wiring? The driver's side works fine. Any suggestions?