Communications: electrical – Land vehicle alarms or indicators – Of burglary or unauthorized use
Patent
1995-06-21
1997-09-23
Hofsass, Jeffery
Communications: electrical
Land vehicle alarms or indicators
Of burglary or unauthorized use
340428, 34082531, 34082532, 34082534, 307 102, 307 103, 116 33, B60R 2510
Patent
active
056709331
ABSTRACT:
If agreement between an identification code transmitted from a transmitter 111 installed in a door key 11 and a predetermined identification code is detected in an immobilizing ECU 12, a variable code including a predetermined key word is transmitted from the immobilizing ECU 12 to an engine ECU 13, and the variable code is decoded in the engine ECU 13. If the decoded key word does not agree with the predetermined key word, the starting of the engine is inhibited.
According to another aspect of this invention, a variable code is transmitted from the engine ECU 13 to the immobilizing ECU 12, a returning variable code is calculated based on a predetermined key function in the immobilizing ECU 12, and it returns to the engine ECU 13. If an agreement with returned variable code and a reference variable code determined in the engine ECU 13 is detected for the predetermined period, the starting of the engine is inhibited.
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Hofsass Jeffery
Mannaua Ashok
Toyota Jidosha & Kabushiki Kaisha
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