Repair procedures: Inspection

Check that the red light flickers when the door lock or unlock button is pressed on the transmitter.
Remove the battery and check voltage if the red light doesn't flicker.
Standard voltage: 3V

Fig 1: Checking Keyless Entry Battery Voltage
Courtesy of HYUNDAI MOTOR AMERICA
Insert the battery (A) into the tester (09954-2p100).

Fig 2: Battery In Tester
Courtesy of HYUNDAI MOTOR AMERICA
Push the test button and If "0.00" is displayed on screen, it means that the battery voltage is 2V or less.
If "L" is displayed on screen, it means that the battery is low power and it needs to be replaced.
To prevent the discharge of electricity, turn the tester power off.
Replace the transmitter battery with a new one. If voltage is low power then try to lock and unlock the doors with the transmitter by pressing the lock or unlock button five or six times.
If the doors lock and unlock, the transmitter is OK, but if the doors don't lock and unlock, register the transmitter code, then try to lock and unlock the doors.
If the doors lock and unlock, the transmitter is OK, but if the doors don't lock and unlock, replace the transmitter.
WARNING: An inappropriately disposed battery can be harmful to the environment and human health. Dispose the battery according to your local law(s) or regulation.