Door open? -_-

[fudge12]

i would bet the trunk as others have stated. the plastic rest plate is a major culprit.

i have had this same issue (on an 05v6). i went as far as replacing the trunk switch for like $15-20, dont do that. i believe the issue is tied to high humidity in the trunk compartment. my solution is usually to run the dog sht out of the defroster. at least every other day, and especially on a rainy day. Also make sure you have a sealed battery, and have the vent hose connected properly. Also, I would refrain from storing bottled water and other liquids in the trunk as that contributes to the humidity. someone smarter than me could probably figure out a way to make that switch more resistant to humidity...

as a general rule of thumb you should probably run your defroster for a min or two before exiting the vehicle if there is fog on the windows.

Well it's not the trunk. I closed the door and watched through the rear glass as I pressed the plunger switch. The light still remained lit.

 

[joegr]

Well it's not the trunk. I closed the door and watched through the rear glass as I pressed the plunger switch. The light still remained lit.

I assume that the light inside the trunk went on and off with the trunk switch? (On when released, off when pressed in?)
If not, then this is where the problem is (bad switch or wiring). If the light in the trunk did switch, then you are right and it's not the problem.

 

[fudge12]

Well it looks like you were right. I wasn't pressing hard enough on the switch. It looks like someone bent the plunger so it wasn't making contact with the trunk lining. A quick bend using a flat blade screwdriver did the trick and all is well. The engine bay plunger seems to be permanently grounded. But I don't care. Thanks guys!

 

[jrand]

Well it's not the trunk. I closed the door and watched through the rear glass as I pressed the plunger switch. The light still remained lit.

yeah, thats what im saying: mine does that when it gets humid inside the trunk compartment

 

[jrand]

I assume that the light inside the trunk went on and off with the trunk switch? (On when released, off when pressed in?)
If not, then this is where the problem is (bad switch or wiring). If the light in the trunk did switch, then you are right and it's not the problem.

correct, but if the light did switch and you are sure that the trunk IS the problem then you need to check the plastic plate that the switch rest on when closed. chances are its loose or the something else is out of spec and causing it to lose contact.

i can tell you that after wrecking my ls and having my trunk bay be slightly out of spec that if your taillight assemblies are not in spec that they can cause the trunk to not close properly. you may have some wiggle room while installing the actual lamp housing and the reflectors on the trunk. keeping the two from rubbing each other will keep the trunk lid seating properly. if they are touching (the light assembly and the reflector on the trunk) it can cause the trunk to not seat properly and the switch to lose contact when you hit a bump

 

[fudge12]

I'll take pictures after work. It was just the switch assembly that was bent out of place.