Sorry to revive this thread, but I've been having this issue with a 2007 Jetta and have done the following:
- Replaced latch - didn't work
- Fixed old latch using spring trick - didn't work
- Removed emergency release handle and cable - didn't work
- Adjusted pin where latch latches - didn't work
I'm out of ideas, the truck always closes fine, but sometimes decides to open 10 second later again, this also happens while driving! VERY annoying and dangerous. For the time being, I've disconnected the electrical connection to the trunk latch, and it does not open.
Every time the truck does open, I can hear the motor opening it, so somehow it's being triggered. Is there a relay or control unit I can have a look at? Maybe messed wiring? Or maybe some kind of switch?