My key wont turn to ulock my doors

Please clarify the inquiry

Not sure of the year of your Tahoe but I can tell you the standard procedure to program your key for say like a 1999. First make sure your battery has a full charge. Next if you have any security related trouble codes stored in your computer, you will need to clear the codes either by clearing them with a scanner or disconnecting the battery for at least 10 minutes to clear the codes. The first step is to turn the key and just let it turn over quick but not enough to where the vehicle starts and shuts down again. Just kind of tap the key as if starting it so the starter turns the engine for a second. When you do that just release the key so it stays in the "Run" position. Lights will be on in the instrument cluster including the security light. The security light may flash on and off. Leave the key in the run position for 10 minutes. After 10 minutes the security light usually goes out but not in all cases. After 10 minutes in the run position, turn the key to the off position but do not remove the key. Wait 10 seconds and do the first step again (Tap again let key stay in run position for 10 minutes). You will need to do this 3 times totally about 30 minutes. On the 3rd time when the 10 minutes is up, turn off key, do not remove the key and then start the vehicle. This procedure should work to progam your key. If it doesn\'t you may have another problem with the security system. Let me know how it turns out and I hope there isn\'t another problem and the computer just lost the transponder code. there is a security relay/module that sometimes goes bad in those Tahoes but try programming the keys first. If that doesn\'t work and you need further help as far as that relay/module & to let me know how it turned out,

Open the door,when alarm goes off insert key into ignition and alarm should go off and it should start,try that.

The solution is to do some testing,do something

You can assume & guess all you want

1) Key turns but dose not unlock door. This means that the rod that goes to the back of the lock has came off. This also means that is the reason door is not unlocking with the remote as it pops the lock rod inside the door which pushes the lock open.
2) Key does not turn lock at all but works passengers side door. This means that the locks has been changed in the door, but that doesn't sound like the problem as you say the remote doesn't open the drivers side door so more than likely the rod has came off the back of the lock

I would take it back to the place where the alarm was installed or a dealer that installs that brand of alarm for proper diagnosis.

The 2003 Sonata is equipped with a 'starter KILL' burglar alarm system with disables the starting system (using a N/C 'contacts' configuration instead of a N/O contacts configuration). N/C=Normally closed, and N/O=Normally open contacts. When the alarm goes off with a MY Sonata, the only way to DISARM it is with the key fob (remote) originally programmed for it (unless you purchase a new remote & have it programmed for the vehicle at an authorized Hyundai Service Department). NOTE: So long as the keyless entry & burglar alarm system is functioning/operating normally, the alarm will keep going off and the STARTER KILL function will still prevent you from starting the vehicle. One option is left without purchasing a new remote and having it programmed.
1. When the alarm goes off, get into the vehicle and insert the ignition key into the ignition.
2. Turn the key to the 'RUN' position (NOT the ACC position) and wait for the alarm to STOP (usually about 3 to 5 minutes).
3. The engine should then start using the ignition key.

If this procedure doesn't work, the problem will need further diagnosis by a qualified/certified Hyundai Service Technician.

Hope this helps

No it wont. But disconnecting the battery or running it completely dead can. When the battery is disconnected the cars security goes into theft mode. I believe on yours you have to lock all the doors from the inside lock button, then shut the door. use your keys to unlock the door, put the keys in the igntion and turn it on, dont start it. wait for the light to go out. if it doesn't then start it after a minute or two..

CHECK THE INSTRUMENT CLUSTER FOR POWER TO GAUGES TO SEE IF THEY WORK WHILE IGNITION IS IN THE ON POSITION.IF NO CHECK THE 40 AMP IGNITION FUSE.IF FUSE GOOD IGNITION SWITCH IS BAD OR HAS A LOOSE OR BROKEN WIRE.IF FUSE GOOD ALL GAUGES IS WORKING.I BE LOOKING AT STARTER AND STARTER SOLENOID.REMOVE THEM HAVE AUTO ZONE TEST STARTER.OR YOU CAN GET A REMOTE STARTER SWITCH AND SET OF BATTERY CABLES.HOOK BATTERY CABLES TO A BATTERY.WITH STARTER OUT OF CAR TAKE BATTERY CABLES HOOK NEGATIVE BATTERY TO STARTER BODY FOR GOOD GROUND.TAKE POSITIVE BATTERY CABLE HOOK TO STARTER POSITIVE TERMINAL WHERE POSITIVE BATTERY CABLE GOES.THEN HOOK THE REMOTE SWITCH RED WIRE TO STARTER POSITIVE TERMINAL AND THE OTHER REMOTE SWITCH WIRE TO THE S OR SWITCH TERMINAL ON STARTER SOLENOID.PRESS THE REMOTE SWITCH IS STARTER RUNS GOOD WITH NO FUNNY NOISES ITS GOOD IF STARTER DONT RUN THE STARTER SOLENOID OR STARTER IS BAD. THE PROBLEMS IN YOUR CAR COULD BE A BAD KEY TRY ANOTHER KEY YOUR CAR HAS THE THEFT DETERRENT MODULE SYSTEM BEST TO HAVE CAR SCAN TO CHECK THE THEFT SECURITY MODULE AND THE TRANSMISSION NEUTRAL SAFETY SWITCH IF ITS BAD STARTER WONT WORK.ALSO CHECK THE THEFT DETERRENT MODULE RELAY. BEFORE REMOVING BATTERY CABLES TURN OFF RADIO SO YOU WONT LOSE YOUR RADIO PLAYING CODE.

KEYLESS REMOTE PROGRAMMING
1- Driver's door open & unlocked. Key out of ignition
2- Insert & remove key 2 times within 5 seconds
3- Close & open drivers door twice within 40 seconds
4- Insert key into ignition & remove
5- Close & open drivers door twice within 40 seconds
6- Insert key into ignition
7- Close the door
8- Turn ignition switch from "LOCK" to "ON" & back to "LOCK"
- ONCE for ADD mode
- TWICE for REWRITE mode
9- Remove the key from ignition
10- To confirm your mode selection, the power locks will now cycle "lock" to
"unlock" a number of times corresponding to your key cycles in step 8
11- Within 40 seconds of confirmation
- Press both transmitter Lock & Ulock buttons simultaneously
- Within 3 seconds press transmitter Lock button for more than 1 second
- If successful, the power locks will cycle once (twice indicates
transmitter problems)
- Repeat step 11 for additional remotes
12- Open door to exit programming.