The transmitter will not work if any of the following occurs:
Avoid placing the transmitter and your cell phone or smart phone in the same pants or jacket pocket and maintain adequate distance between the two devices.
When the transmitter does not work correctly, open and close the door with the mechanical key. If you have a problem with the transmitter, we recommend that you contact an authorized Kia dealer.
CAUTION
Keep the transmitter away from water or any liquid. If the keyless entry system is inoperative due to exposure to water or other liquids, it will not be covered by your manufacturer’s vehicle warranty.
CAUTION
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. If the keyless entry system is inoperative due to changes or modifications not expressly approved by the party responsible for compliance, it will not be covered by your manufacturer’s vehicle warranty.
Kia Niro 2017 (DE HEV) Service Manual: Front Door Outside Handle Repair procedures
Replacement
Put on gloves to protect your hands.
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Use a plastic panel removal tool to remove interior trim pie ...
Kia Niro 2017 (DE HEV) Service Manual: Inside Rear View Mirror Components and components location
Component Location
1. Inside rear view mirror
...