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3. OPERATING PROCESS (D20DTR)
1) Operation and Warning Lamp
(1) Operating process
1.
The ECU sends the challenge message to immobilizer control unit when turning on the ignition. (It
requests the validation of key. If failed, sends validation signal 3 times in 2 seconds again. If the
validation is failed again, stop the validation and wait for 10 seconds, and then start new validation
process.)
2.
The immobilizer control unit sends the crypto code to the transponder.
3.
The transponder sends back the crypto signal to the immobilizer control unit as a response.
4.
The immobilizer control unit converts the signal to crypto signal.
5.
The immobilizer control unit compares the crypto signal with the signal from the transponder.
6.
If two signals are identical, the immobilizer control unit determines the key is valid, and it sends the
positive message to the ECU.
7.
The ECU allows starting the engine.
Transponder
In the following cases, you may be unable to start the engine with the immobilizer.
-
When two or more immobilizer keys come into contact with (each) other(s).
-
When the key is close to any device sending or receiving electromagnetic fields or waves.
-
When the key is close to any electronic or electric devices such as lighting equipment, security keys
or security cards.
-
When the key is close to a magnetic or metal object or a battery.
Immobilizer
Control Unit
CAN HIGH
CAN LOW
ECU
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