LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2007 >> GS 430 >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Door Lock >> Smart Access System With Push-Button Start >> System Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

System Description

CAUTION: If using a pacemaker, be sure to read the manual of the pacemaker before using the key, as the radio waves of the key may affect the pacemaker.
  1. SMART ACCESS SYSTEM WITH PUSH-BUTTON START DESCRIPTION 
    1. In addition to conventional mechanical key and wireless door lock control functions, the entry and start system enables door locking/unlocking, steering lock releasing, engine starting and luggage compartment door opening without operating the key. The only requirement is that the key is in the user's possession.
      • This system is controlled by the certification ECU. When the certification ECU detects the presence of the smart access system with push-button start in one of the detection areas, it identifies and checks the ID code, and outputs operation signals to the related ECU in accordance with their functions.
      • The detection areas are formed by 4 oscillators and 4 antennas (4 door oscillators, 2 luggage compartment antennas, and 2 indoor antennas).
  2. DETECTION AREA 
    Fig 1: Identifying Detection Area
    G05299217Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Precautions for the entire system:
      • Be sure to carry the key during inspection of the smart access system with push-button start.
      • As weak radio waves are used to detect the key, the key detection area may decrease, or the key may not be detected correctly in the following situations:
    1. The key battery is depleted.
    2. Any facilities that generate strong radio waves, such as a TV tower, power plant, broadcast station or gas station, are located near the inspection site.
    3. A wireless device, such as a cellular phone, is carried with the key.
    4. The key is in contact with or covered with metal.
    5. Another wireless door lock control function is operated near the vehicle.
    6. The key is located near a device that generates high voltage or noise.
    • The key may be difficult to operate for a reason relating to the vehicle body shape.
    • The key may not be detected correctly if it is around the vehicle's windows, the door handle or center of the bumper even when it is in the detection area outside the vehicle.
    • The key may not be detected correctly if it is on the instrument panel, rear package tray or floor, or in the glove box even when it is in the detection area inside the vehicle.
    • The engine cannot be started even when the key is in the detection area inside the luggage compartment.
    • The key may not operate if the key is not held properly.
    • The smart access system with push-button start does not operate in the following conditions:
    1. The smart access system with push-button start is canceled.
    2. The key battery is completely depleted (the indicator does not blink when pushing any of the buttons on the key).
  3. FUNCTION OF MAIN COMPONENTS 
    MAIN COMPONENTS FUNCTION CHART

    Components Function
    Key Consists of mechanical key, transmitter for wireless door lock control and transceiver for smart access system with push-button start
    Certification ECU Controls smart access system with push-button start in accordance with signals from each oscillator, various switches, ECUs and key
    • Judges and certifies ID code from entry door control receiver
    • Transmits engine immobiliser unset signal to ID code box
    • Transmits steering unlock signals to steering lock ECU
    Power Source Control ECU Controls push button start function in accordance with signals from various switches, ECUs and combination meter
    • Transmits key verification request signal to certification ECU in accordance with engine switch signal, and turns relays ON and OFF
    Immobiliser Code ECU Receives steering unlock or engine immobiliser unset signals from certification ECU, certifies them, and transmits unset signals to steering lock ECU or ECM
    Cowl Side Junction Block LH (Driver Side Junction Block ECU)
    • Receives request signal from certification ECU and actuates door lock motor to unlock or lock door
    • Transmits each door condition to certification ECU
    Outside Door Handle (driver, passenger, rear doors) (antenna) Transmits request signals
    Outside Door Handle (driver, passenger, rear doors) (touch sensor) Detects when person touches inside of outside handle
    Outside Door Handle (driver, passenger, rear doors) (lock switch) Transmits door lock request signals to certification ECU
    Door Electrical Key Oscillator (driver, passenger, rear doors) Receives request signal from certification ECU, and forms detection area around each door
    Indoor Electrical Key Antenna (front and rear) Receives request signal from certification ECU, and forms detection area in vehicle interior
    Luggage Compartment Electrical Key Antenna (inner) Receives request signal from certification ECU, and forms detection area in luggage room
    Luggage Compartment Electrical Key Antenna (outer) Receives request signal from certification ECU, and forms detection area around luggage compartment door
    Entry Door Control Receiver
    • Receives ID code from key in detection area and transmits it to certification ECU
    • Receives ID code from key in luggage room and transmits it to certification ECU
    Rear Grass Antenna Receives ID code from key and transmits it to entry door control receiver
    Outside Rear View Mirror
    • Foot Light
    		 When key enters exterior detection area, foot light is illuminated in accordance with request signal of certification ECU
    Power Luggage Door Open Switch Transmits luggage compartment door open request signal to certification ECU
    Stop Light Switch Outputs state of brake pedal to power source control ECU
    Wireless Door Lock Buzzer
    • Combination Meter
      • Multi-information Display
      • Buzzer
    		 When certification ECU detects human errors such as those below, it warns driver by sounding wireless door lock buzzer, displayed displays information and sounds buzzer in accordance with request signal from ECU
    Example:
    • Key is taken outside vehicle
    • Driver leaves vehicle while engine is still running
    • Driver leaves vehicle while shift lever is in position other than P
  4. CONSTRUCTION AND OPERATION 
    1. Key

      The key consists of a mechanical key, a transmitter function for the wireless door lock control and a transceiver for the smart access system with push-button start.

      • The transceiver function for the smart access system with push-button start receives the signals from the oscillators and sends the ID code to the tuner.
      • The transmitter function for the wireless door lock control has a LOCK switch, UNLOCK switch, LUGGAGE COMPARTMENT switch, PANIC switch.
      • This mechanical key works for the driver door, luggage compartment door and glove box, but cannot start the engine.

      A total of 7 keys can be registered.

      Fig 2: Identifying Mechanical Key
      G05299218Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Oscillator (each door oscillator, front and rear indoor antenna, luggage compartment inner antenna, luggage compartment outer antenna)

      Each oscillator transmits the request signal received from the certification ECU, and forms a key detection area to detect the presence of a key. The detection area formed by each door oscillator and luggage compartment outer antenna is approximately 0.7 to 1.0 m (2.3 to 3.3 ft.) from the outside handle of each door or the center of the rear bumper.

      • The detection area of each door oscillator is formed by transmitting a request signal every 0.25 seconds while the engine switch is off and each door is locked. In this way, it detects the proximity of a key. During entry lock, the detection area is formed with the lock switch ON.
      • The detection area of the luggage compartment outer antenna is formed when the power luggage door open switch is ON.
      • The detection area of the indoor antenna (front and rear) is formed when the driver door is opened or closed, during start ignition, when a warning is activated, or when the lock switch is ON.
      • The detection area of the luggage compartment inner antenna is formed when the luggage compartment door is closed or the luggage compartment open switch is pressed.
  5. ENTRY FUNCTION OPERATION 
    1. The smart access system with push-button start has the following functions.
    ENTRY FUNCTION OPERATION CHART

    Function Outline
    Mechanical Key Operation is same as conventional mechanical key.
    Wireless Door Lock Control This function remotely locks and unlocks all doors or luggage compartment. Operation is same as wireless door lock control system.
    However, the receiver in certification ECU uses entry door control receiver to control locking and unlocking.
    Entry Illumination When person carrying key enters detection area, door will enter unlock standby mode and front map light and door mirror foot light will illuminate.
    Entry Unlock When key is located in detection area of door oscillator, door will unlock by touching inside of outside door handle.
    Entry Unlock Mode Switching (see CUSTOMIZE PARAMETERS ) Changes doors that can be unlocked with entry unlock function between 4 modes.
    • Driver door mode
    • Doors on one side mode
    • One door Mode
    • All door Mode
    Entry Lock When key is located in detection area of door oscillator and engine switch is off, door can be locked by pressing lock switch on outside door handle.
    Entry Luggage Compartment Open When key is in detection area of luggage compartment outer oscillator, luggage compartment opens by pressing luggage compartment open switch.
    Memory Call This function operates driving position memory system in accordance with key ID code.
    Key Lock-in Prevention
    • Prevents confinement of key if door is locked using outside door handle while key is still inside vehicle.
    • If all doors locked and luggage compartment door is closed while key is still in luggage compartment, warning buzzer sounds. If luggage compartment open switch is operated, luggage compartment door can be opened.
    Warning When any of situations below occur, smart access system with push-button start causes certification ECU to sound buzzer in combination meter and wireless door lock buzzer, and illuminate information in order to alert driver.
    • Exit warning if shift lever position is not P and power source mode is not off.
    • Exit warning if shift lever position is P and power source mode is not off.
    • Warning if occupant leaves with key.
    • Warning if engine switch is operated while key is outside actuation area.
    • Warning if entry lock is operated while key is inside vehicle.
    • Warning if key battery is weak.
    Battery Saving If key is constantly located within actuation area of door oscillator, system maintains periodic communication with key. Therefore, if vehicle remains parked in that state for long time, key battery and vehicle battery could be drained.
    Key Cancel (see CUSTOMIZE PARAMETERS ) Following key functions can be cancelled by following certain operations.
    • Entry Unlock/Lock
    • Entry Ignition
    • Memory Call
    • Entry Luggage Compartment Open
    • Key Lock-in Prevention
    • Warning
  6. WIRELESS DOOR LOCK AND UNLOCK AND LUGGAGE COMPARTMENT OPEN FUNCTION 

    Push the LOCK/UNLOCK/PANIC/LUGGAGE COMPARTMENT switch on the key to operate each function.

  7. ENTRY UNLOCK FUNCTION 
    1. The detection area is formed by communication between a door oscillator and tuner when the door is locked in order to detect access of the person carrying the key.
    2. When the person carrying the key enters the detection area around the vehicle, the matching of the ID codes for a door oscillator and key will automatically be performed. After the matching is completed, the door will enter unlock standby mode.
    3. In unlock standby mode, the antenna built into the outside handle starts sensing. If the outside handle is held (the back side of the handle is touched), the door unlock operation will be performed. At this time, the hazard warning light blinks twice and the wireless door lock buzzer sounds twice.
    4. If any of the doors are not opened after a door unlock operation, all doors will automatically lock after 30 seconds.
  8. ENTRY LOCK FUNCTION 
    1. After leaving the vehicle carrying the key, push the lock switch on the outside handle when all the doors are closed.
    2. The certification ECU determines whether the key is located inside or outside of the cabin based on the information from a door oscillator and room oscillator. Then matching of the ID codes is performed.
    3. When the matching result shows that the ID codes of the key and indoor antenna do not match and the ID codes of the key and door oscillator match, the door lock function will operate. At this time, the hazard warning lights blink once and the wireless door lock buzzer sounds once.
    4. If the key is located inside of the cabin, the door lock function will not operate and the alarm buzzer (beep sound) will sound for 2 seconds.
  9. ENTRY LUGGAGE COMPARTMENT OPEN FUNCTION 

    Stand in front of the luggage compartment with the key and push the power luggage door open switch to start the matching of the ID codes for the luggage compartment antenna (outer). If the ID codes match, luggage compartment door open operation will be performed.

  10. PREVENTION OF KEY CONFINEMENT FUNCTION 
    1. If you attempt to lock the door through keyless operation (move the lock knob to the lock position and then close the door) with the key in the cabin, the system determines that the key is located in the cabin and unlocks the door.
    2. If the luggage compartment is closed with the key in it, the alarm will sound and the luggage compartment can be opened only when all the doors are locked in order to prevent key confinement in the vehicle.
  11. ENTRY ILLUMINATION FUNCTION 

    When a person carrying the key enters the detection area, the door will enter unlock standby mode and the front map light and door mirror foot light will illuminate.

    HINT:

    The entry illumination function operates when the key enters the vehicle exterior detection area from out of the detection area. If the key remains in the detection area for 3 seconds or more, the illumination function does not operate.

  12. MEMORY CALL FUNCTION 

    When the engine switch is off and the driver door courtesy light is off, opening the door will operate the memory call function (the door will move to a previously recorded driving position). Using the key, memory call, key registration and key cancellation can be performed.

  13. WARNING FUNCTION 
    1. General

      When any of the situations below occur, the smart access system with push-button start causes the certification ECU to sound the buzzer in the combination meter and the wireless door lock buzzer, and illuminates the combination meter's multi-information display in order to alert the driver.

      WARNING FUNCTION CHART (GENERAL)

      Warning Function Operation Condition Situation
      Exit warning if shift lever position is not P and power source mode is not off. A
      Exit warning if shift lever position is P and power source mode is not off. B
      Warning if occupant leaves with key. C
      Warning if engine switch is operated while key is outside the detection area. D
      Warning if entry lock is operated while key is inside vehicle. E
      Warning if key battery is weak. F
    2. Situation A

      There are 2 patterns for situation A.

      Pattern 1: In situation A, the door is opened and the user tries to leave the vehicle.

      Pattern 2: Then the user holds the key and tries to move away from the vehicle.

      In these situations, the following control is performed.

      • Pattern 1
        WARNING FUNCTION CHART - SITUATION A (PATTERN 1)

        Possible Effects without Warning Sudden vehicle start, vehicle theft, vehicle roll-away
        Warning Condition Certification ECU gives warning when all following conditions are satisfied
        • Shift lever position is not P
        • Engine switch is not off
        • Driver side door is opened and closed
        • Vehicle speed is 0 km/h (0 mph)
        Combination Meter
        • Buzzer
        WARNING: Continuous sound
        Warning is stopped when one of following conditions are met
        • Engine switch is off
        • Shift lever position is P
        • Vehicle speed is 0 km/h above (0 mph)
        Combination Meter
        • Multi-information Display
        		 -
        Wireless Door Lock Buzzer -
      • Pattern 2
        WARNING FUNCTION CHART - SITUATION A (PATTERN 2)

        Possible Effects without Warning Sudden vehicle start, vehicle theft, vehicle roll-away
        Warning Condition Certification ECU gives warning when all following conditions are satisfied
        • Shift lever position is not P
        • Engine switch is not off
        • Driver side door changed from open to close
        • Vehicle speed is 0 km/h (0 mph)
        • Key is not in vehicle
        Combination Meter
        • Buzzer
        WARNING: Continuous sound
        Warning is stopped when one of following conditions are met
        • Engine switch is off
        • Shift lever position is P
        • Vehicle speed is above 0 km/h (0 mph)
        Combination Meter
        • Multi-information Display
        WARNING: Information below is displayed alternately on combination meter:
        • "Shift to P Range"
        • "Key is not Detected"

        Warning is stopped when one of following conditions are met

        • Engine switch is off
        • Key is in vehicle
        Wireless Door Lock Buzzer
        WARNING: Continuous sound
        Warning is stopped when one of following conditions are met
        • Engine switch is off
        • Shift lever position is P
        • Key is in vehicle
        • Vehicle speed is above 0 km/h (0 mph)
    3. Situation B

      There are 3 patterns for situation B.

      Pattern 1: In situation B, the door is opened and the user tries to leave the vehicle.

      Pattern 2: Then the user holds the key and tries to move away from the vehicle.

      Pattern 3: Then the user tries to use the entry lock and presses the lock switch.

      In these situations, the following control is performed.

      • Pattern 1
        WARNING FUNCTION CHART - SITUATION B (PATTERN 1)

        Possible Effects without Warning Vehicle theft
        Warning Condition Certification ECU gives warning when all following conditions are satisfied
        • Shift lever position is P
        • Engine switch is not off
        • Driver side door is opened
        Combination Meter
        • Buzzer
        WARNING: Continuously sound
        Warning is stopped when one of following conditions are met
        • Engine switch is off
        • Shift lever position is not P
        • Driver door is closed
        Combination Meter
        • Multi-information Display
        		 -
        Wireless Door Lock Buzzer -
      • Pattern 2
        WARNING FUNCTION CHART - SITUATION B (PATTERN 2)

        Possible Effects without Warning Vehicle theft, engine can not be restarted
        Warning Condition Certification ECU gives warning when all following conditions are satisfied
        • Shift lever position is P
        • Engine switch is not off
        • Driver side door changed from open to closed
        • Key is not in vehicle
        Combination Meter
        • Buzzer
        WARNING: Sounds once
        Combination Meter
        • Multi-information Display
        WARNING: Information below is displayed on combination meter:
        • "Key is not Detected"

        Warning is stopped when one of following conditions is met
        • Engine switch is off
        • Key is in the vehicle
        Wireless Door Lock Buzzer
        WARNING: Sounds 3 times
        Warning is stopped when one of following conditions is met
        • Engine switch is off
        • Vehicle speed is above 0 km/h (0 mph)
      • Pattern 3
        WARNING FUNCTION CHART - SITUATION B (PATTERN 3)

        Possible Effects without Warning Vehicle theft
        Warning Condition Certification ECU gives warning when all following conditions are satisfied
        • Shift lever position is not P
        • Engine switch is not off
        • All door are closed
        • Lock switch is "ON"
        • Key is not in vehicle
        Combination Meter
        • Buzzer
        		 -
        Combination Meter
        • Multi-information Display
        		 -
        Wireless Door Lock Buzzer
        WARNING: Sounds for 2 seconds
    4. Situation C

      In this situation, the following control is performed.

      WARNING FUNCTION CHART - SITUATION C

      Possible Effects without Warning Engine cannot be restarted
      Warning Condition Certification ECU gives warning when all following conditions are satisfied
      • Engine switch is not off
      • Except driver door changed from open to close
      • Vehicle speed is 0 km/h (0 mph)
      • Key is not in vehicle
      Combination Meter
      • Buzzer
      WARNING: Sounds once
      Combination Meter
      • Multi-information Display
      WARNING: Information below is displayed on combination meter:
      • "Key is not Detected"
      Warning is stopped when one of following conditions is met
      • Engine switch is off
      • Vehicle speed is above 0 km/h (0 mph)
      Wireless Door Lock Buzzer
      WARNING: Sound 3 times
      Warning is stopped when one of following conditions is met
      • Engine switch is off
      • Vehicle speed is above 0 km/h (0 mph)
    5. Situation D

      In this situation, the following control is performed.

      WARNING FUNCTION CHART - SITUATION D

      Possible Effects without Warning Confuses the user
      Warning Condition Certification ECU gives warning when all following conditions are satisfied
      • Engine switch is not off
      • Key is not in vehicle
      Combination Meter
      • Buzzer
      WARNING: Sounds once
      Combination Meter
      • Multi-information Display
      WARNING: Information below is displayed on combination meter for 8 seconds (disappears after 8 seconds):
      • "Key is not Detected"
      Wireless Door Lock Buzzer -
    6. Situation E

      In this situation, the following control is performed.

      WARNING FUNCTION CHART - SITUATION E

      Possible Effects without Warning Vehicle theft
      Warning Condition Certification ECU gives warning when all following conditions are satisfied
      • Engine switch is not off
      • All door are closed
      • Lock switch is "ON"
      • Key is in vehicle
      Combination Meter
      • Buzzer
      		 -
      Combination Meter
      • Multi-information Display
      		 -
      Wireless Door Lock Buzzer
      WARNING: Sound for 2 seconds
    7. Situation F

      In this situation, the following control is performed.

      WARNING FUNCTION CHART - SITUATION F

      Possible Effects without Warning Smart access system with push-button start does not function
      Warning Condition Certification ECU gives warning when all following conditions are satisfied
      • Engine switch to off after being left in on (IG) for over 20 minutes
      • Key battery voltage is low
      Combination Meter
      • Buzzer
      WARNING: Sounds once
      Combination Meter
      • Multi-information Display
      		 Information below is displayed on combination meter:
      • "Low Key Battery"
      Wireless Door Lock Buzzer -
  14. BATTERY SAVING 
    1. Vehicle Battery Saving Function

      In the smart access system with push-button start, signals are emitted outside of the vehicle at a prescribed interval (0.25 seconds) when the doors are locked. Therefore, the vehicle battery could be drained if the vehicle remains parked for a long time. For this reason, the controls listed below are affected.

      BATTERY SAVING CONTROLS LIST

      Condition Control
      Both conditions below are met for 5 days:
      • Key is not in detection area
      • Touch sensor or lock switch operation is not performed
      		 Signal transmission interval is extended from 0.25 to 0.75 seconds
      Both conditions below are met for 14 days:
      • Key is not in detection area
      • Touch sensor or lock switch operation is not performed
      		 Automatically deactivates the smart access system with push-button start

      Reinstatement Conditions

      • A wireless door lock control signal (lock, unlock) is input and the ID matches.
      • A user carries the key and pushes a lock switch on an outside door handle.
      • A door is locked or unlocked by the mechanical key.
    2. Key Battery and Vehicle Battery Saving Function In the smart access system with push-button start, if the key is constantly located within the vehicle exterior detection area of the doors, the system maintains periodic communication with the key.

      Therefore, if the vehicle remains parked in that state for a long time, the key battery and the vehicle battery could be drained. For this reason, if this state continues longer than 10 minutes, the smart access system with push-button start automatically becomes deactivated.

      Reinstatement Conditions

      • A wireless door lock control signal (lock, unlock) is input and the ID code matches.
      • A user carries the key and pushes a lock switch on an outside handle.
      • A door is locked or unlocked by the mechanical key.
scientia non olet · About LEMON Manuals