ENGINE IMMOBILISER SYSTEM DESCRIPTION
The engine immobiliser system is designed to prevent the vehicle from being stolen. This system uses a transponder key ECU assembly that stores the key codes of authorized ignition keys. If an attempt is made to start the hybrid control system using an unauthorized key, the transponder key ECU assembly sends a signal to the power management control ECU to prohibit starting hybrid control system.
FUNCTION OF MAIN COMPONENTS
| Component | Outline |
|---|---|
| Transponder key ECU assembly | Checks the ID code received from the transponder key amplifier and if the results match, a hybrid control system start permission signal is sent to the power management control ECU. |
| Transponder key coil | When the key is inserted into the ignition key cylinder, the transponder key coil receives the key ID code from the transponder chip in the key grip and outputs it to the transponder key ECU assembly. |
| Power management control ECU | The power management control ECU receives the ID verification results from the transponder key ECU assembly. The power management control ECU also verifies the ECUs. Then the judgment of whether or not to disable the hybrid control system is made. |
| Unlock warning switch assembly | Detects whether the key is in the ignition key cylinder and outputs the results to the transponder key ECU assembly. |
SYSTEM FUNCTION
When the transponder key ECU assembly detects that the unlock warning switch assembly is on, the transponder key ECU assembly provides current to the antenna coil and produces a weak electric wave. A transponder chip in the key grip receives the electric wave. Upon receiving the electric wave, the transponder chip outputs a key ID code signal. The transponder key coil receives this signal and transmits it to the transponder key ECU assembly.
The transponder key ECU assembly compares the key ID code with the vehicle ID code, which was previously registered in the transponder key ECU assembly, and communicates the results to the power management control ECU. After the identification results show that the key ID code matches the vehicle ID code and the transponder key ECU assembly has confirmed their match: 1) the engine immobiliser system is canceled and the hybrid control system starting controls enter standby mode.