Electronically Coded Keys

Each valid ignition key has an internal transponder which transmits a unique code. When a key is inserted into the ignition lock, the transponder is inductively coupled to the detection coil. The transponder interacts with the detection coil to generate an amplitude modulated signal which is conducted from the detection coil to the immobilizer control unit. The immobilizer control unit reads the radio-frequency signal. A release message is sent to the powertrain control module (PCM)/engine control module (ECM) if the key is authorized.
New keys are coded by using a scan tool. Refer to "Key Coding Procedure".