
If the remote key is not working properly, try replacing the battery with a new one.
Battery Type: CR2032
To replace the battery:
1. Insert a slim tool into the slot and gently pry open the cover.
2. Using a screw driver, remove the battery cover.
3. Remove the old battery and insert a new battery. Make sure the battery position is correct.
4. Reinstall the battery cover and key cover in the reverse order of removal.
If you suspect your remote key might have sustained some damage, or you feel your remote key is not working correctly, it is recommended that you contact an authorized HYUNDAI dealer.
Information

An inappropriately disposed battery can be harmful to the environment and human health. Dispose of the battery according to your local law(s) or regulations.
Mechanical key
Smart keyHyundai Kona (OS) 2018-2026 Service Manual: Front Wiper Motor Repair procedures
Removal
1.
Disconnect the negative (-) battery terminal.
2.
If necessary, release the wiper blade fixing clip by pulling up
and remove the wiper blade from the inside radius of wiper arm.
...
Hyundai Kona (OS) 2018-2026 Owners Manual: Windshield washers
In the OFF (O) position, pull the lever gently toward you to spray washer fluid
on the windshield and to run the wipers 1-3 cycles.
The spray and wiper operation will continue until you release the lever.
If the washer does not work, you may need to add washer fluid to the washer fluid
reservoir. ...