Originally Posted by JereRB

Water could possibly be the reason. I only purchased the car four months ago, so can't say if water was or wasn't in the trunk before then. I know it doesn't leak and hasn't had water since my purchase, but no clue about beforehand.

Also, can you clarify what you mean by "locking module"? If you mean the vacuum pump in the trunk, that was replaced this morning. I'll go check the connectors again though, just to be on the safe side. If you're referring to another module, I'll need the proper name for my google-fu to work right on it.

*edit*

Went and checked the connectors going in to the vacuum pump. Dusty, duct tape bundling the three yellow lines has about had it, but no signs of rust. Feh.



Yes, that's correct. Pushing the passenger side lock down, using the key to lock the driver side. This does not lock the trunk hatch or the fuel door.