With the immobilizer system, whenever you insert your ignition key into the ignition switch and turn it to ON, it checks and determines and verifies if the ignition key is valid or not.
If the key is valid, the engine will start. If the key is invalid, the engine will not start.
To deactivate the immobilizer system: Insert the ignition key into the key cylinder and turn it to the ON position.
To activate the immobilizer system:
Turn the ignition key to the OFF position. The immobilizer system activates automatically. Without a valid ignition key for your vehicle, the engine will not start.
Kia Cee'd JD Owners Manual: Starting the gasoline engine
1.Make sure the parking brake is
applied.
2.Manual Transaxle - Depress the
clutch pedal fully and shift the
transaxle into Neutral. Keep the clutch
pedal and brake pedal depressed
while turning the ignition switch to the
start position.
Automatic Transaxle/DCT* - Place
the transaxle ...
Kia Cee'd JD Service Manual: Compressor Repair procedures
Removal
1.
If the compressor is marginally operable, run the engine at idle speed,
and let the air conditioning work for a few minutes, then shut the engine
off.
2.
Disconnect the negative cable from the battery.
...