To do this, turn on the ignition, use your centralized button to enter the digits, several quick presses (example: 2 for digit 2) then a stop of one and a half seconds to confirm the digit and resume, repeat the procedure until you have entered the entire code. This should let you start your Hyundai Tucson without having to remove the immobiliser.
The method is pretty simple, you take a thin flat, head screwdriver and hammer it into the keyhole. The point here is to break the key locks inside so that the cylinder turns freely. If you do the method properly, it will only take a couple of swings, and then you turn the screwdriver just like the factory key. An understanding of the electrical part of the car will also come in handy. In general, to describe the sequence of actions to disable the immobilizer is simple, since on any car this operation consists of similar actions. The operation of both contact and contactless IMMO is based on the following principles:
The first is to check the fuse box and look for a blown fuse. If you find one, replace it and see if that fixes the problem. If not, the next step is to check the wiring harness for any loose or damaged wires. If you find any, repair or replace them as needed. If the problem still persists, the last resort is to replace the immobilizer itself.
The transponder gets it's power from the EWS pickup coil located around the ignition switch. The code sent by the transponder is picked up by the EWS coil and compared with a list of good codes programmed from the factory. If it's not on the list the EWS deactivates the starter motor. Everything will still work, radio, lights, doors, windows

Manually remove your immobilizer. Although you may be thinking to bypass the immobilizer from your Fiat 500, this is not recommended at all for some reasons. First your Fiat 500 would be much more vulnerable to theft attempts. Actually, without an immobiliser box, simply doing “the wires” may be enough to turn your car on.

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how to disable car immobilizer