On a vehicle equipped with a smart key, the trunk can be opened using the Smart Trunk system.
Hyundai Sonata LF 2014-2019 Service Manual: Rear Console Cover Components and Components Location
Component Location
1. Rear console cover
...
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 ...