First check the battery in the key fob/remote.
Then it wouldn't hurt to reprogram it just to ensure it's being recognized by the receiver.
Both procedures are well covered and illustrated in the Owners Manual, plus more in the 'Related Questions' below
Unlock the doors or trunk with the key.
Yes, you can unlock some car doors with a cell phone using a compatible app or technology like Bluetooth or remote keyless entry systems.
If the key will not work in the door or the liftgate, you will need to call a locksmith or break a window.
To program the keyless entry remote on a Chevy Malibu, close all doors and put the key in the ignition. Hold down the power unlock button on the door while turning your key to on and off twice. Then release the power unlock button on the door.
Instructions By Auto's Only Locksmith1 Sit in the car with the doors shut and unlocked, and with your seat belt fastened to avoid interference from the seat belt reminder chime.2 Put the key in the ignition, and turn it from position one ("Off") to position three ("On") rapidly eight times within 10 seconds, ending in position three.3 The Ford Focus doors will lock and unlock automatically, signaling that the car is in remote keyless entry programming mode.4 Within 20 seconds, press any button on each keyless remote. After each remote is programmed, the car doors will automatically lock and unlock to confirm successful programming. When all remotes have been programmed, turn the ignition to position one. The doors will automatically lock and unlock, confirming that remote keyless entry programming is complete.
To clarify just a bit. The doors no longer unlock when car is turned off or when using the keyless entry remote. Using the key and the button on the drivers side door still works with out a problem. Also, the doors will still lock when car is turned on and when the doors are locked using keyless entry remote.
have you checked to batteries in the remote?
While holding the door unlock button on your driver's door, turn the key to ON then OFF, then ON, then OFF. Release the unlock button and the doors should lock/unlock to confirm the PDM is in programming mode. Then hold the door unlock and door unlock buttons on your remote at the same time. After about 15 seconds the doors should lock and unlock to acknowledge that it's picked up the remote. Program all remaining remotes at this time. The system will take up to four remotes.
To program a keyless remote for a 2007 Kia Sportage, first, sit inside the vehicle and close all doors. Insert the key into the ignition and turn it to the "On" position without starting the engine, then turn it back to "Off" and remove the key. Repeat this step multiple times (usually 5 times) until the doors lock and unlock, indicating the vehicle is in programming mode. Finally, press any button on the remote, and the doors should lock and unlock again to confirm successful programming.
To program a keyless remote for a 2006 Buick Lucerne, sit in the driver's seat and close all doors. Insert the key into the ignition and turn it to the "On" position without starting the engine, then turn it back to "Off" and remove the key. Repeat this process twice, then insert the key again and turn it to "On." Press and hold the "Lock" and "Unlock" buttons on the remote simultaneously for about 15 seconds until the doors lock and unlock, confirming successful programming.
# Sit in car, doors closed. Electronically unlock all doors using the power door unlock switch on the driver's door. # Insert key into ignition switch and turn from OFF to ON 8 times within 10 seconds with the 8th time ending in the ON position. (5 times on some models) # The doors should lock and unlock by themselves to signal programming mode. # Using your remote: lock the doors.
One reason that a keyless entry remote will not open the doors is a dead battery, either on the vehicle or the key itself. Another reason is that the remote needs to be reprogrammed.