Hyundai Tucson Owners & Service Manuals

Hyundai Tucson: Smart Key / Smart key precautions. Replacing the battery

Smart key precautions

The smart key may not work if any of the following occur:

  • The smart key is close to a radio transmitter such as radio station or airport that may interfere with normal operation of the transmitter.
  • The smart key is near a mobile two way radio system or a mobile phone.
  • Another vehicle’s smart key is being operated close to your vehicle.
  • The vehicle battery is discharged.
  • Connecting an external device to the power outlet and placing the smart key near the external device.

If the smart key does not work correctly, open and close the door with the mechanical key. To start the engine, press the Button Start ignition switch directly with the smart key. If you have a problem with the smart key, contact an authorized HYUNDAI dealer.

If the smart key is in close proximity to your mobile phone, the signal could be blocked by your mobile phone’s operational signals. This is specifically relevant when the phone is active such as making and receiving calls, text messaging, and/or sending/receiving emails. If possible, avoid keeping the smart key and your mobile phone in the same location such as pants or jacket pocket to avoid interference between the two devices.


  • Keep the smart key away from electromagnetic materials that may block electromagnetic waves to the key surface.
  • Always have the smart key with you when leaving the vehicle. If the smart key is left near the vehicle, the vehicle battery may be discharged.

Replacing the battery

Battery type: CR2032

To replace the battery:

1. Remove the mechanical key.

2. Use a slim tool or utility blade to open the cover of the smart key. Use caution not to damage the smart key.

3. Remove the old battery and insert a new one. Make sure the battery position is correct.

4. Reinstall the rear cover of the smart key.

If you suspect your smart key might have sustained some damage, or you feel your smart key is not working correctly, contact an authorized HYUNDAI dealer.


This product contains a button battery. If swallowed, a lithium button battery can cause severe or fatal injuries within 2 hours. Keep batteries out of reach of children.

If you think batteries may have been swallowed or placed inside any part of the body, seek immediate medical attention.


Always dispose batteries in accordance with local laws and regulations.

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