Key wont work properly

Try spraying some PB Blastor into the key hole...sometimes a piece of dirt can keep the key from turning...Hope this helps. (Lock Anti-freeze)

You need to replace the lock actuator in the doors that are not locking/unlocking with the door switch/remote. If the remote works for most of the doors then it is fine. The actuator is what moves the lock when it gets the signal from the remote or door switch to move it.
Good luck

if the key does not turn the lock spray it out with wd 40 run key in and out of lock few times.because everyone uses remotes to open their cars the waffers in the door locks get coroded and wont fall in proper place when key is inserted.give it good cleaning and see if it will unlock

TRY PUTTING THE KEY IN PASSENGER DOOR SOUD LIKE SECURITY SYSTEM NO WORKING PROPERLY BUT TRY PASSENGER DOOR LOOK IF NOT TRY REAR HATCH

Hi,
Kindly submit the question under 1999 Toyota Avalon section on the website by clicking this link so that the best car experts can view and post a solution to the problem.

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from outside the car make sure all doors a closed completely, make sure hood and trunk are also closed. lock the vehicle with the remote, unlock it and repeat, lock and unlock. if it still wont start, put the key in the driver door lock, lock and unlock the door three times with the key, then try to start.

try this procedure to reporgram:

1. Close all vehicle doors.

2. Insert the key into the ignition.

3. Hold down the power UNLOCK button on the driver's continue to hold down until instructed
to release in step 9.

4. Perform steps 5 through 8 in fairly rapid succession.

5. Turn the key to the ON position (as far as you can go without starting the engine).

6. Turn the ignition switch to the OFF position.

7. Turn the ignition switch to the ON position.

8. Turn the ignition switch to the OFF position.

9. Release the power unlock button on the door panel. The vehicle will lock and unlock the doors automatically.

10. Hold down the LOCK and UNLOCK buttons on the transmitter simultaneously until the vehicle locks and unlocks.
This step may take up to 30 seconds.

11. Repeat step 10 NOW for each additional transmitter (including any existing transmitters).

12. Turn the ignition switch to the ON position in order to exit the transmitter programming mode

Dude, the same thing happened with my EL falcon. It turned out to be the key fob! The buttons were sometimes sticking and all of a sudden it would re-lock. Ususally it would unlock then immediately relock. Leaving no time to get into the the car. Sometimes we would be driving and the Alarm would go off without touching a thing. I ditched the Key Fob and all was well again.
I hope this helps

sounds like you need to replaced the latch in the door. or like my 06 cobalt lt the door was bouncing and not closing all the way, or not opening. they cleaned my latch and i havent had a problem since, but that latch in the door could be your problem.

Door Locks Go Crazy 1



Door Locks Go Crazy 2

Door Locks Go Crazy 3


Not to difficult to understand what's happening ,when you know how they work .Plus you need tool the proper tools to diagnose .