The smart key will not work if any of the following occur:
When the smart key does not work correctly, open and close the door with the mechanical 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 phones normal operational signals. This is especially important when the phone is active such as making and receiving calls, text messaging, and/or sending/receiving emails. Avoid placing the smart key and your mobile phone in the same pants or jacket pocket and always try to maintain an adequate distance between the two devices.
CAUTION
Keep the smart key away from electromagnetic materials that blocks electromagnetic waves to the key surface.
Information
This device complies with Part 15 of the FCC rules.
Operation is subject to the following three conditions:
1. This device may not cause harmful interference, and
2. This device must accept any interference received, including interference that may cause undesired operation.
3. Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the device.
Hyundai Sonata LF 2014-2019 Service Manual: Repair procedures
Operation and Leakage Check
Check all of the following items:
ComponentProcedureBrake Booster (A)Check brake operation by applying the brakes during a test
drive. If the brakes do not work properly, check the brake booster.
Replace the brake booster as an assembly if it does not work properl ...
Hyundai Sonata LF 2014-2019 Service Manual: Components and Components Location
Component Location
1. Horn switch2. Horn relay (Built - in Metal Core Block PCB)3. Horn (Low pitch)4. Horn (High pitch)5. Clock spring
...