GENERAL INFORMATION




  1. When the electric motor switch is turned ON, the transponder (a small transmitter) incorporated in the key transmits a key ID peculiar to each key to the ETACS-ECU by radio wave.
  2. The ETACS-ECU compares the sent key ID with the already-registered key ID, and only when they match, the ETACS-ECU sends a signal to the EV-ECU to enable the electric motor to be started.
  3. The system is designed to be maintenance-free because the power source for the transponder is supplied by the ETACS-ECU. Two electric motor keys are provided, and up to eight keys can be registered to one vehicle as needed. More than one trillion of key ID combinations can be registered, and parts of them are irregularly changed whenever the electric motor key is turned ON. This feature prevents ID copying, resulting in higher security of the system.

CONSTRUCTION DIAGRAM




MAIN COMPONENTS


Component name
Outline of function
Transponder
 Is power-supplied by the key ring antenna. When the transponder receives random number data, the transponder processes random number data and the encrypted code. Then it transmits the process result to the ETACS-ECU.
Key ring antenna
 The ETACS-ECU supplies power via an antenna on a steering lock by transmission of electromagnetic waves to a transponder built into a key, using magnetic coupling
ETACS-ECU (Immobilizer-ECU)
  • Supplies electrical power to the transponder integrated in the key, and transmits random number data.
  • Verifies the key ID which is sent from the transponder. If the ID is correct, it sends an electric motor mobilization signal to the EV-ECU.

EV-ECU
 Communicates with ETACS-ECU via CAN when the electric motor switch is turned ON and permits/stops the vehicle integrated control.
EMCU
 Communicates with the EV-ECU via CAN to enable or disable the electric motor to be started.