My dad had the same problem. Check the fuses, especially if you have a remote.
Usually it is the switch, if there is a switch on other doors use those to see it the locks work until eventually you find the one that does not work.
i approve of these answers, very well said
To reset Citroen C3 immobilizer if the car won't lock or unlock: Unlock driver door manually, get in vehicle and close all doors. Put key in ignition and switch to on position. Hold down the lock button for 10 seconds. Switch ignition off and wait 30 seconds. get out of car and lock.
Your alarm system is in valet mode. To fix this problem: Unlock the car, and open the door. With the door open, and the car unlocked, press: LOCK/UNLOCK button ONCE, press the AUX button ONCE, and then press the LOCK/UNLOCK button ONCE more. When you press this key combination, the vehicle security system should begin functioning correctly again.
unlock all of the doors, either on your key or from inside the car by pressing the unlock button manually. you have to press it twice to unlock all of the doors.
It is just a safety feathure that Toyota has.
You can if the key has a door lock/unlock button. I lock mine all the time with the remote. If you have the button on the key and it is not working then maybe the battery in the remote is dead? Open it up and replace the battery.
unlock button!
Remove the key from the ignition before locking. It is to prevent the keys from being locked in the car.
there is no button or switch. there is a gas door lock that is incorporated into the central locking unit on your car. it locks when you lock the car and unlocks when you unlock the car.
Press the unlock button on the key. It's impossible for you to lock your keys in this car because it will automatically unlock if you lock it with the keys inside. If you managed to lock the keys in there, congratulations you have defeated an idiot proof system.
Put key in ignition. Turn two clicks. Do not start car. Press and hold lock button. Turn back off with lock button still being held. Remove key. Now at the same time you are holding lock button, press unlock button five times about a second each. Test the unlock or lock button. Worked the first time for me. Took about eight seconds to complete!
My 1994 dodge eagle vision alarm would not shut off--tried disconnecting battery and waiting thirty minutes and that did not work. But what did work was this way-------Lock all doors manually by hand--do not use the power button on side of the door--then in drivers side put in the key in the door and turn key to unlock -then lock -then unlock -then lock -then unlock. alarm will be going off at this time but after the third lock -unlock- the alarm should stop and then go in and the car should start.
Just unlock the doors of the car, and the gas cover will also get unlocked, manually open it pushing the right side.