Hyundai Sonata: Smart Key / Battery replacement
If the Smart Key is not working properly, try replacing the battery with a new one.
Battery Type: CR2032
To replace the battery:
1. Pry open the rear cover of the smart key.
2. Remove the old battery and insert the new battery.
3. 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.
Information
An inappropriately disposed battery can be harmful to the environment and human health. Dispose the battery according to your local law(s) and regulation(s).
Smart key precautions
The smart key will not work if any of the following occur:
The smart key is close to a radio transmitter such as a radio station or
an airport which can interfere with normal operation of the tran ...
Immobilizer System
The immobilizer system protects your vehicle from theft. If an improperly coded
key (or other device) is used, the engine's fuel system is disabled.
When the ignition switch is placed in the ON posit ...
Other information:
Hyundai Sonata LF 2014-2019 Service Manual: Heater & A/C Control Unit (Manual) Repair procedures
Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Using a screwdriver or remover, remove the center fascia panel (A).
3.
Disconnect the A/C & heater controller connectors (A).
4.
Remove the heater and A/C controller (A) from the center facia panel.
5.
Install in ...
Hyundai Sonata LF 2014-2019 Service Manual: Engine Coolant Temperature Sensor (ECTS) Repair procedures
Inspection
1.
Turn the ignition switch OFF.
2.
Remove the ECTS (Refer to "Removal").
3.
After immersing the thermistor of the sensor into engine coolant, measure resistance between the ECTS terminals 3 and 4.
4.
Check that the resistance is within the specification.
Specification: ...
