Pattern A Off A Igon after the engine is started


System Operation


The driver holds the key and enters the vehicle.


When the driver presses the engine switch once with the following conditions satisfied, the main body ECU recognizes the engine switch signal and transmits the key certification request to the certification ECU. Shift position is P or N. Brake pedal depressed. Power source is at OFF.


The certification ECU receives the certification request and transmits a request signal to the front/rear oscillators. These oscillators then transmit the request signal.


The brake pedal is depressed, so the main body ECU turns ON the green indicator light of the engine switch.


The moment the key receives the request signal, it transmits its ID code to the tuner. The signal includes the response code.


The tuner receives this code and transmits it to the certification ECU.


The certification ECU judges and certifies the ID code, and transmits a key certification OK signal to the main body ECU.


After receiving the key certification OK signal, the main body ECU turns ON the ACC relay.

Park/Neutral Position Switch

Stop Light Switch b)

Stop Light Switch b)

Main Body ECU

Tuner d)

Local Communication 1 f) '

Certification ECU

Front/Rear Oscillators

ACC Relay




System Operation


The main body ECU turns ON the ACC relay, and then turns ON the IG relays.


The certification ECU checks that the power source has switched from OFF to IG-ON, and transmits a steering unlock signal to the main body ECU and ID code box.


The main body ECU receives this signal and supplies power to the steering lock ECU.


The steering lock ECU receives the steering unlock signal via the ID code box, and releases the steering lock.


After checking the steering unlock condition, the certification ECU transmits an engine immobilizer disengage signal to the ID code box.


The ID code box certifies the disengage signal of the certification ECU, transmits the engine immobilizer disengage signal to the ECM, and disengages the engine immobilizer.

j) l)





System Operation


After checking that the steering is in the unlocked condition, the main body ECU transmits a starter request (STSW) signal to the ECM.


The ECM receives this signal, outputs an ST relay (STAR) signal, and actuates the starter. (For details see the cranking hold function on page EG-132.)


The ECM and main body ECU both output the starter relay signal in order to actuate the starter. Both the ECM and main body ECU output the signal in order to prevent situations where the starter may fail to operate, such as when the battery voltage supplied to the ECM is low.


When the ECM judges from the engine speed that engine start is completed, it stops the starter relay (STAR) signal, and stops the starter.


The main body ECU receives this signal, checks that engine start is completed, and turns OFF the indicator light of the engine switch.

Engine Switch s)

Main Body ECU

Crankshaft Position Sensor (Engine Speed Signal)

ST CUT Relay

Park/Neutral Position Switch

ST Relay

Local Communication

Steering Lock ECU



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