1992 Subaru trunk won't open with either the key or inside release cable seems to be loose in trunk or broke

Trunk won open even with manual release http://newbeetle.org/forums/new-beetle-convertible/54170-trunk-wont-open-even-manual-release.html there is good info here C24OF

Re-adjust the cable and lubricate, repair or replace the lock assembly.

Button probably bad.
Remove button from dash connect multimeter and set to continuity and press button listening for beep

Lower the back seat and crawl into the trunk and see what the latch is doing when you activate the key fob. the trunk lid will have to be open to enable any repairs. Also an emergency release cable is probably visible (yellow handle) inside the trunk and will Open the trunk lid.

The actuator may sound as though it is working but the latch could be damaged or misaligned. Also, the actuator could be too weak to operate the latch. If it is necessary to replace the actuator, your Camry is old enough to make a junkyard a likely source.

1. Open trunk
2. Place latch in lock position
3. Pull inside trunk release to see what isn't moving
4. If trunk key won't turn, the key may be worn out and need to be replaced

Sometimes you will find a button inside the Glovebox. This is an Electric trunklid release. Some of the models had controls on the lower drivers door along with the Gasflap release. It depends on the Series that you have. The S, and GS, had less features than the LS model.

You can go to a Locksmith and they have a box of keys and will try them until one opens your trunk. Then you can have a key made to match your lock.

I don't believe the inside releases were made standard in 1992.

not entirely sure about your buick, but I have a 2000 pontiac that has a switch just inside the glovebox that deactivates the trunk switch. that, together with locking the glovebox would prevent someone with jsut the valet key from gaining access to the trunk area.

cable knocked loose and key wouldn't work if it did previously. last option, obtain acess from back passenger seat and pull aux cable or force lock open, as far as the key issue, call a locksmith

Did you check all your fuses? Are you in cold enough weather that it may be frozen