Trunk release button doesen't work

When you push button on dash do you hear trunk actuator. Because neither key nor switch works do this. If you can enter trunk from inside car and use a flashlight look around for a pull lever or a button use it this should open the trunk. When you get open replace trunk latch mechanism

I would check the owners manual or with Cadillac - its possible the remotes lost part of the signal and need to be reset. It sounds like the receiver is not getting a signal from them by using that button.
Could be the receiver too.

check trunk fuse

There are 3 phases to fixing your car's trunk lid release problem.

Phase 1: First check the fuse - once you know that's OK, then proceed to phase 2 (below).
The fuse for the trunk lock is
the bcm (pwr) 15A fuse in the instrument panel fuse box (behind panel at drivers right foot)

Check that fuse, as it is the power supply for the button on the dash that sends power to the actuator in the trunk.

Phase 2: Get the trunk open (without taking it to the dealership).
If you have remote keyless entry to the trunk, you could try that - but with the actuator
dead/dying, it shouldn't work.

Here are a couple of ideas to try to enter trunk while (a) actuator isn't working, and (b) all
valet lockout features (designed to deny valets access to the trunk) are in the "Lock" position:

There is the lock cylinder, which you stated is not functioning - put the key in, and it doesn't
turn. Just to be sure, consider: lubricate key with Graphite lock-type lubricant, and retry.

The trunk has 2 valet safetys...the locking rear seats which require access to the trunk to unlock, and then there is a valet switch in the trunk that locks the button on the dash from working to keep valet parking attendants out of the trunk. That may be in the lock position.

You can try accessing the center area of the fold down rear seat and see if you can unhinge the rear seat from there. Maybe reach in with your hand, or an extension-type tool.

there may be a way to fold the hinge away from the seat back so it can be removed from the hinge and give you access to the safety latch in the trunk and open it that way (white handle in trunk).
The white-handled safety latch release is desiged to prevent accidentally trapping children, and
if you can pull it with your extending-type or grasping-type tool, the trunk will open whether or
not the actuator motor is working.

Phase 3: Replace the Problem part.

Your failed part may be either (1) Trunk Release Relay, or (2) Trunk Lock Release Switch

My Satrun ION manual doesn't cover either of these parts, and the online parts houses, e.g.
http://www.rockauto.com/catalog/x,carcode,1431624,pgname,Electrical-Switch%2B%2526%252338%253B%2BRelay,a,search.yahoo.com%2BSearch%2Bfor%2B2004%2BSATURN
fail to provide instructions. One of those times a mechanic has to t=rely on his/her native
handiness and/or experience.
To identify which of these parts is bad, locae the Trunk Release Relay (call your dealer parts
dept. for helpful tips on finding it), then operate the dashboard trunk release button with your
ear close tothe relay - if it makes a noise, the problem is the Trunk Lock Release Switch in
the trunk lid, otherwise its the relay.

check in your glove box on left hand side.valet switch may have accidentally set.let me know how you make out!

My avalon 2002 trunk was not opening. The problem was a little switch in the glove compartment was depressed I puched the switch back in and wala everything was just fine again. A lil black switch in the glove compartment. wish u the best.

I have the same problem with 94 Cadillac, trunk is locked and can't open, cannot get rear seat back off, any suggestions how?

try removing rear seats to obtain access

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

There are only 4 ways to open a Fiero trunk. With the key, with the electric trunk release, with a locksmith, and with a big hammer and screwdriver.

Some year Fieros required the parking brake be applied to activate the electric release, some had to be in park, and some of the early models would work just by pushing the button. The ground is through the latch, itself. If anything has gotten on the body portion of the latch and the trunk was closed, like a towel or plastic bag, that prevents the trunk portion from making metal to metal contact with the body striker, the release won't activate. If you can put power to the car, insert a key into the trunk lock, clamp one end of a negative jumper cable to it, and the other end underneath to some part of the frame. Hit the release button. This trick completes the ground circuit directly into the latch mechanism and bypasses the body striker plate.

If this doesn't work, remove the release switch from the dash, unplug it, and apply power with a 9V flashlilght battery to the terminals. You may have to play with the emergency brake handle during these processes.