Starting System: Description and Operation

2GR-FSE STARTING: SMART ACCESS SYSTEM WITH PUSH-BUTTON START: SYSTEM DIAGRAM

SYSTEM DIAGRAM





Communication table:





2GR-FSE STARTING: SMART ACCESS SYSTEM WITH PUSH-BUTTON START: SYSTEM DESCRIPTION

SYSTEM DESCRIPTION

1. PUSH-BUTTON START DESCRIPTION
(a) The push-button start uses a push-type power switch, which the driver can operate by merely carrying the key. This system consists of the power source control ECU, power switch, ID code box, steering lock ECU, key, ACC relay, IG1 relay, IG2 relay, stop light switch, HV control ECU and certification ECU. This function operates in cooperation with the smart access system. The table below shows the transition of the power switch, which is different depending on whether the brake pedal is depressed or released.
(b) This system has different power source mode patterns depending on the brake pedal condition and shift lever position.





When the battery of the key is low, the push-button start function can be operated by holding the key against the power switch.
2. FUNCTION OF COMPONENT






3. SYSTEM FUNCTION
The electric controls of the push-button start function are described below:






4. CONSTRUCTION AND OPERATION





(a) Power switch:
Power switch consists of a momentary type switch, 3 color (amber, green, greenish white) LEDs, and transponder key amplifier.
- The greenish white LED is for illumination.
- The amber and green LEDs are for the indicator lights. The driver can check the present power source mode and whether the engine (hybrid) can start or not in accordance with the illumination state of the indicator light.
- When the power source control ECU detects an abnormality in the push-button start function, it makes the amber indicator light flash. If the engine (hybrid) stopped in this state, it might not be possible to restart it.

(b) Indicator light condition:

Power switch indicator light condition





(c) Power source control ECU:
The power source control ECU consists of the IG1 and IG2 relay actuation circuits, CPU, and hold circuit.
- The hold circuit is installed to prevent the power supply to the relays from being cut off when an abnormality occurs in the IG1 and/or IG2 relay actuation circuits during driving.





HINT: Before removing the battery, make sure to turn the power switch OFF. The power source control ECU constantly stores the present power source mode in its memory. Therefore, if the power to the power source control ECU is interrupted by disconnecting the battery, the power source control ECU restores the power source mode after the battery is reconnected. For this reason, if the battery is disconnected when the power switch is not OFF, the power will be restored to the vehicle at the same time the power is restored to the power source control ECU (by reconnecting the battery).





5. WHEN KEY BATTERY IS LOW
(a) To operate the push-button start function when the key battery is low, hold the key close to the power switch with the brake pedal depressed.
(b) The power source control ECU transmits a key verification request signal from the stop light switch to the certification ECU.
(c) The certification ECU does not receive an ID code response from the entry door control receiver, so it actuates the transponder key amplifier built into the power switch.
(d) The transponder key amplifier outputs an engine immobiliser radio wave to the key.
(e) The key receives the radio wave, and returns a radio wave response to the transponder key amplifier.
(f) The transponder key amplifier combines the key ID codes with the radio wave response, and transmits it to the certification ECU.
(g) The certification ECU judges and verifies the ID code, and transmits a key verification OK signal to the power source control ECU. The buzzer in the combination meter sounds at the same time.
(h) After the buzzer sounds, if the power switch is pressed within 5 seconds with the brake pedal not depressed, the power source mode changes to ON (ACC) or ON (IG), the same as in the normal condition.

6. DIAGNOSIS
The power source control ECU can detect malfunctions in the push-button start function when the power source mode is ON (IG).
When the ECU detects a malfunction, the ECU stores the 5-digit DTC (Diagnostic Trouble Code) in the memory.

- The DTC can be read by connecting Techstream to the DLC3.