Engine Start Operation When Intelligent Key Is Contacted To Push-Button Ignition Switch

When brake pedal is depressed while selector lever is in the P position, BCM activates immobilizer antenna amplifier that is located on push-button ignition switch backside.
When Intelligent Key (transponder built-in) backside is contacted to push-button ignition switch, immobilizer ID verification is started between Intelligent Key built-in transponder and immobilizer antenna amplifier.
When immobilizer ID verification result is OK, buzzer in combination meter sounds.
BCM transmits immobilizer ID verification result to ECM via CAN communication.
When push-button ignition switch is pressed, BCM transmits steering unlock signal to steering lock unit and IPDM E/R.
IPDM E/R supplies power supply to steering lock unit via steering lock relay.
When unlocking steering lock, steering lock unit unlocks steering lock.
When BCM detects that steering is unlocked, power supply stop signal is transmitted to IPDM E/R.
IPDM E/R turns steering lock relay OFF and stops power supply to steering lock unit.
BCM turns ACC relay ON and transmits ignition power supply ON signal to IPDM E/R.
IPDM E/R turns ignition relay ON and starts ignition power supply.
BCM detects that the shift position is P or N.
BCM transmits starter request signal to IPDM E/R via CAN communication. When engine start conditions* are satisfied, BCM turns starter motor relay in IPDM E/R ON.
When starter request signal is received, IPDM E/R turns starter motor control relay ON.
IPDM E/R supplies power supply via starter motor relay and starter motor control relay, activates starter motor, and starts cranking.
When BCM receives engine start or speed feedback signal from ECM, BCM transmits stop signal to IPDM E/R, turns starter motor relay OFF, and stops cranking.