System Description [09/2015 - ]

1. The push-button start uses a push-type engine switch, which the driver can operate by merely carrying the key. This system consists primarily of the main body ECU, engine switch, ID code box, steering lock ECU, key, D-ACC relay, D-IG1-1 relay, IG2 relay and certification ECU. The main body ECU controls the system. This function operates in cooperation with the smart access system with push-button start. The table below shows the transition of the engine switch, which depends on whether the brake pedal is depressed or released.
2. This system has different power source mode patterns depending on the brake pedal and shift lever conditions.

   Shift Position	Brake Pedal	Power Source Mode when Engine Switch Pressed
   P	Released	Off → on (ACC) → on (IG) → off
   P	Released	Engine running → off
   P	Released	On (ACC)* → off
   P	Depressed	Off → engine starts
   P	Depressed	On (ACC) → engine starts
   P	Depressed	On (IG) → engine starts
   P	Depressed	Engine running → off
   P	Depressed	On (ACC)* → off
   N	Released	Off → on (ACC) → on (IG) (after power source mode changes to on (IG), power source mode changes between on (IG) and on (ACC) every time engine switch is pressed)
   N	Released	Engine running → on (ACC)
   N	Depressed	Off → engine starts
   N	Depressed	On (ACC) → engine starts
   N	Depressed	On (IG) → engine starts
   N	Depressed	Engine running → on (ACC)
   Not P or N	Released	Off → on (ACC) → on (IG) (after power source mode changes to on (IG), power source mode changes between on (IG) and on (ACC) every time engine switch is pressed)
   Not P or N	Released	Engine running → on (ACC)
   Not P or N	Depressed	Off → on (IG)
   Not P or N	Depressed	On (ACC) → on (IG)
   Not P or N	Depressed	Engine running → on (ACC)

   HINT: 

   *: This situation is only applicable when the power source mode has changed from on (IG) to on (ACC). However, this situation is not applicable when an emergency stop is performed by pressing and holding the engine switch for 2 seconds or more or by quickly pressing the engine switch 3 times or more.

3. When the battery of the key or card key is low, the push-button start function can be operated by touching the key or card key to the engine switch.

The electric controls of the push-button start function are described below:

• *: w/ Lexus Enform Remote

1. Remote engine start and stop function (start operation)
   1. When using the key:
      1. Point the key at the vehicle and press and release the lock switch twice. Immediately press and hold the lock switch.

      HINT: 

      The engine can be started start by the remote engine start and stop function when all of the following conditions are met:

      • All of the doors are closed.
      • The engine hood is closed.
      • The engine switch is off.
      • The battery voltage is 11 V or higher.
      • The cumulative engine running time after being started by remote engine start and stop is less than 15 minutes.
      • All of the doors are locked by the key.
      • The engine has not already been started by remote engine start and stop.
   2. When using the application:

      Refer to SYSTEM DESCRIPTION [09/2015 - ] .

2. Remote engine start and stop function (stop operation)
   1. When using the key, perform either of the following operations:
      1. Press the unlock switch.
      2. Press and hold the lock switch.

      HINT: 

      The engine will stop when any of the following conditions is met:

      • Any door is opened.
      • The engine hood is opened.
      • The engine switch is pressed.
      • A stop request is received from the key or Service Center.
      • The theft deterrent system enters the alarm sounding state.
      • The battery voltage drops to less than 11 V.
      • 10 minutes elapse after the engine is started.
      • The cumulative engine running time after being started by remote engine start and stop is 20 minutes or more.
      • The shift lever is moved to a position other than P.
      • The vehicle speed is 5 km/h or more.
      • The stop lights illuminate.
      • Any door is unlocked.
      • The engine speed is more than 3000 rpm for 0.2 seconds.
      • The engine is malfunctioning.
      • The fuel level warning is displayed on the multi-information display in the combination meter assembly.
      • The CAN communication is malfunctioning.
   2. When using the application:

      Refer to SYSTEM DESCRIPTION [09/2015 - ] .

3. Remote air conditioner system

   Refer to SYSTEM DESCRIPTION [09/2015 - ] .

Fig 1: Identifying Indicator Light

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Engine switch:

   The engine switch consists of a momentary type switch, 2 colored LED (amber, green), and transponder key amplifier.

   • The amber 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 can start or not in accordance with the illumination state of the indicator light.
   • When the main body ECU detects an abnormality in the smart access system with push-button start, it makes the amber indicator light flash. If the engine is stopped in this state, it might not be possible to restart it.
2. Indicator light condition:
   ENGINE SWITCH INDICATOR LIGHT CONDITION
   
   

   Power Source Mode/Condition	Indicator Light Condition
   	Brake pedal released	Brake pedal depressed, shift lever in P or N
   Off	OFF	Illuminates (green)
   On (ACC, IG)	Illuminates (amber)	Illuminates (green)
   Engine running	OFF	OFF
   Steering lock not unlocked	Flashes (green) for 30 seconds	Flashes (green) for 30 seconds
   System malfunction	Flashes (amber) for 15 seconds	Flashes (amber) for 15 seconds
   Stop light switch with shift lever in P or N malfunction	Flashes (green) for 15 seconds	Flashes (green) for 15 seconds

3. Main body ECU:

   The main body ECU consists of the D-IG1-1 relay, D-ACC relay and IG2 relay actuation circuits and CPU.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. To operate the push-button start function when the key or card key battery is low or affected by wave noise, etc., touch the LEXUS mark of the key or card key to the engine switch while depressing the brake pedal with the shift lever in P or N.
2. The main body ECU transmits a key verification request signal from the stop light switch to the certification ECU.
3. The certification ECU does not receive an ID code response from the door control receiver, so it actuates the transponder key amplifier built into the engine switch.
4. The transponder key amplifier outputs an engine immobiliser radio wave to the key.
5. The key receives the radio wave, and returns a radio wave response to the transponder key amplifier.
6. The transponder key amplifier combines the key ID codes with the radio wave response, and transmits it to the certification ECU.
7. The certification ECU judges and verifies the ID code, and transmits a key verification OK signal to the main body ECU. The buzzer in the combination meter sounds at the same time.
8. After the buzzer sounds, with the shift lever in P or N, if the engine switch is pressed within 10 seconds with the brake pedal not depressed, the power source mode changes to on (ACC) or on (IG), as in the normal condition.

The main body 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 amber indicator light of the engine switch flashes to warn the driver. At the same time, the ECU stores the 5-digit DTC (Diagnostic Trouble Code) in the memory.

• The indicator light warning continues for 15 seconds even after the power source mode is changed to off.
• The DTC can be read by connecting the Techstream to the DLC3.
• The push-button start function cannot be operated if a malfunction occurs.