Under dash trunk button will not open trunk

Let's troubleshoot this issue:

Valet Mode:
First, check if the trunk is in valet mode. Some vehicles have a setting that prevents the trunk from opening using the key fob or the dash button when in valet mode.
Look under the trunk at the top of the license plate area. You'll find a key slot there. Use the physical key section of your key fob to open the trunk manually.

Child Locks:
Ensure that the child lock feature is not accidentally engaged. If it is, the trunk won't open from the outside handle switch.
Switch the child lock to the unlock position and try pulling the trunk handle again before closing the door.

Trunk Release Relay:
If the above steps don't resolve the issue, there might be an issue with the trunk release relay.
Check if there's ground at the switch in the glove compartment when you activate the release switch on the door, the trunk release on the key fob, or the rear handle.
Use a paperclip to jumper between the #30 and the #87 pin sockets of the relay. The pin numbers are usually labeled on the relay body.

Mechanical Issues:
Inspect the trunk latch mechanism for any signs of damage or obstruction.
Verify that the outside trunk handle is properly connected to the latch.

Hyundai azera trunk unlock Switch (youtube.com)

If necessary, consult a professional mechanic to diagnose and fix any mechanical issues.
Remember to follow safety precautions while troubleshooting, and if you're unsure, it's best to seek professional assistance.

First thing is to get the trunk open

(Try to push down the trunk lid before pressing the fob)
ok, let's assume you got it open. Closely inspect the bundle of wires that go into the trunk lid. You will find a small section that will flex when the lid goes from closed to full open. That's the spot to look VERY closely at the flex point. You may find a wire that looses contact due to mechanical agitation while previous openings and closings of the trunk ( a million times).
Fix the wire and spray the trunk latch first with penetrating lube then with pure lube. WITH THE LID STILL OPEN check the remote and the dash button and ensure rhe actions actuate the trunk lid solenoid at the latch.

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

Button inside glove box (on left side) disables trunk opening...just push it again and trunk can be opened...worked for my 2007 Avalon. I must have bunped it by accident to disable the trunk and didn't realize the button existed. Toyota dealer said bring it in for $125 diagnostic but then I saw the cure in the car manual.

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

Take your key and go to the drivers door, make sure the door is unlocked by pulling on the handle, open and close the door. Insert the key and "lock" the door, double check that it is locked by pulling on the handle. Insert the key and "un-lock" the door, use the handle to open the door and now press the fuel door key and it should open, same for trunk release button.

Audi's are a strange breed, sometimes you just need to "re-set" some stuff. But in the future if you lock the car with the key, the fob will unlock the car but the three buttons in the console will not work, the fob will function correctly.

I hope this helps.

there is a manual switch that is located near the trunk latch for a safty lockout it might have been switched by accident look to make sure.hope this helps.

this is how most nissans program the key fobs.
get in the car and manually lock the drivers door with the door switch.
put the key in and out of the ignition about 10 or 12 times until the hazard lights flash once.
turn the key to the ignition setting so all the dash lights are on,but do not start the car.
click the lock button on the remote fob.the hazards should flash once to confirm.
turn off ignition and remove the key.
unlock the drivers door and open the door.
the remote should now work.
if that does not work,the dealer can reprogram the fob with the obd diagnostic system.

You need to program the remote. Get in to the car and LOCK all doors with the switch on drivers side door. Take the key and insert it into the ignition cylinder in and out 6-10 times, until the flashers/hazards flash on your dash board. Or just keep putting the key in and out (nice and easy now, not fast) until you see the lights on dash flash. After the lights flash, turn the key into ACC mode to make the whole dash light up.(do not start car) .With the key in ACC position, hit any button on remote, that will make the hazards flash again. Turn key off and unlock door with switch again. Open door.DONE.
Good luck.