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System Description

  1. DESCRIPTION 
    1. Description

      LEXUS Link is a consumer-based wireless voice and data service for automotive applications, more broadly known as telematics. LEXUS Link is a combination of an on-board dedicated cellular phone, GPS (Global Positioning System), software, hardware, and a remote support call center. The LEXUS Link system is designed to work anywhere in the continental U.S. where GPS and cellular services are available.

    2. System function
      SYSTEM FUNCTION CHART

      Function Outline
      Automatic Emergency Call In the event of an accident in which the SRS airbags are deployed, upon receiving a deployment signal from the center airbag sensor, the telephone ECU assembly automatically makes an emergency call and transmits the vehicle position and user information to the LEXUS Link call center. The user can then speak with the LEXUS Link call center advisor and receive assistance.
      Manual Emergency Call Pressing the emergency button causes the telephone ECU assembly to make an emergency call. The telephone ECU assembly transmits the vehicle position and user information to the LEXUS Link call center. The user can then speak with the LEXUS Link call center advisor and receive assistance.
      Roadside Assistance Pressing the SERVICES button causes the telephone ECU assembly to make a service call. The telephone ECU assembly transmits the vehicle position and user information to the LEXUS Link call center. The user can then speak with the LEXUS Link call center advisor and receive assistance.
      Advisor Record During a call with the LEXUS Link call center advisor, pressing the SERVICES button enables the conversation to be recorded.
      Advanced Services If the user has registered necessary service information at lexus.com within the owners only section, the owner can receive voice recordings from the Internet for weather, traffic and other information.
      Remote Door Locking/Unlocking The doors can be locked or unlocked remotely by the LEXUS Link call center advisor by calling the LEXUS Link call center.
      Remote Horn and Lights If the user calls the LEXUS Link call center, the LEXUS Link call center advisor can flash the lights and sound the horn remotely.
      Handsfree Calling Pressing the phone or PTT button enables the driver to make calls handsfree through voice recognition.
      Stolen Vehicle Tracking In the event of a vehicle theft, if the user calls the LEXUS Link call center, the LEXUS Link call center advisor confirms and tracks the vehicle position using the GPS. The LEXUS Link call center advisor also calls the police when necessary.
      Self Diagnosis When the system error is detected, the LEXUS Link system informs the driver by the red LED illumination or voice warning. The telephone ECU assembly will store trouble codes.
      Voice Prompt The telephone ECU assembly informs the users using a voice prompt.
    3. Function of main components
      Fig 1: Mayday Switch Diagram
      G05764752Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      COMPONENTS SPECIFICATION

      Component Outline
      Map light assembly (Mayday switch) PTT button PTT is abbreviation for Push To Talk Operating this button activates voice recognition (to enter numbers for automated systems, e.g., voice mail) function and makes telephone number registration and handsfree calls possible
      VOL button Volume control button
      It is possible to adjust volume during calls or even when audio system is off
      Phone button Usually has same functions as PTT button. However, in case of answering or hanging up phone, this button also works as hook switch.
      SERVICES button Call is made to LEXUS Link call center advisor and contracted service can be received by pressing this button Pressing SERVICES button while speaking to LEXUS Link call center advisor activates advisor record function Playing recorded voice can be done using voice recognition function.
      Emergency button In case of emergency, call is made to LEXUS Link call center
      Call center will answer call ahead of other calls
      Indicator (Green LED) Turns on when system is under service contact and operating normally Blinks during call and turns off when system is not enrolled (contract expired). Also turns off when red LED is on.
      Blinks when in diagnosis mode to indicate DTC
      Indicator (Red LED) Turns on when telephone ECU assembly detects malfunction in system
      Blinks when call is made when system is still malfunctioning
      Turns off when system is operating normally Blinks if in diagnosis mode to indicate DTC
      Telephone ECU assembly (Mayday ECU) Main control ECU of LEXUS Link system
      • Radio cellular phone module makes or receives call
      • GPS receiver receives signals from telephone antenna (GPS antenna), and transmits vehicle position to CPU
      • Telephone ECU assembly controls LEXUS Link system and provides service according to the request of the user. Also, if detecting malfunction in system, this ECU blinks red LED to inform driver of malfunction.
      Mayday battery In case of automatic or manual emergency call, mayday battery provides power to telephone ECU assembly when power supply from vehicle battery is cut off
      Telephone antenna assembly (GPS antenna function) Receives signals from GPS satellites and transmits vehicle position signal to telephone ECU assembly
      Telephone antenna assembly (Cellular phone antenna function) This antenna is for mobile phones. It is compatible with transmission and reception of frequency bands of analog and digital (CDMA) mobile phones. Transmits signals from telephone ECU assembly and receives signals from LEXUS Link call center or other phones
      Front No. 2 speaker RH Outputs voice of LEXUS Link call center advisor, audio sound and voice prompts Shared with audio system
      Microphone amplifier assembly Voice amplification equipment
      Shared with navigation system
      Located in map light assembly (overhead junction block)
      Center airbag sensor assembly Outputs airbag deployment signal to telephone ECU assembly
      Bus buffer ECU Converts communication between telephone ECU assembly and other ECUs to CAN or BEAN
      Infrastructure Refers to all communication related to LEXUS Link system
    4. System operation
      1. Operation mode
        SYSTEM OPERATION CHART

        Mode Description
        Off Mode The system is in a full sleep state
        On Mode The system is operating (engine switch is on (IG))
        Backup Battery Strategy Flow Mode When certain conditions are fulfilled, the system changes to backup battery mode
        DRx Mode* After the engine switch is turned off, remote service is possible as the system is on standby for incoming calls
        HINT:
        *: (1) If the system is registered in a digital cellular network:
        During the first 8 hours after the engine switch is turned off, the system will remain in stand-by to receive incoming call center calls. After this 8 hour period and for the next 40 hours, the system will cycle between stand-by for 1 minute and off mode for 9 minutes. The system can still receive incoming call center calls during this cycling period. After a total of 48 hours after the engine switch is turned off, the system will switch into off mode until the next time the engine switch is turned on (IG). No call center calls can be received during this time.
        *: (2) If the system is registered in an analog cellular network:
        After the engine switch is turned off, the system will immediately begin the 1 minute stand-by and 9 minute off mode cycle and continue this cycle for 48 hours. After a total of 48 hours, the system will switch into off mode until the next time the engine switch is turned on (IG) (there is no 8 hour stand-by in an analog network).
        *: (3) The system requires a GPS fix to perform the functions described in (1), and (2). If there is no GPS fix, the system will enter off mode immediately after the engine switch is turned off.
        *: (4) GPS fix is lost when B+ is removed from the telephone ECU assembly (mayday ECU). To obtain a GPS fix after re-connecting B+ to the ECU, park the vehicle with the engine switch on (IG) for approximately 5 minutes outside in an open area.
        Fig 2: Lexus Link System Diagram
        G05764753Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Subscription mode
      MODE DESCRIPTION CHART

      Mode Description
      Active Mode Active mode settings are set by the LEXUS Link call center through wireless communication protocol (data is downloaded) Active mode functions according to the type of LEXUS Link subscription
      De-active Mode De-active mode settings are set by the LEXUS Link call center through wireless communication protocol (data is rewritten) If a subscription is made and then temporarily canceled, the system is in de-active mode
      In de-active mode, pressing the SERVICES button will initiate a voice recording.* If the SERVICES button is pressed again during the voice recording, you will be connected to a subscription advisor at the LEXUS Link call center. Your subscription can then be renewed.
      HINT:
      *: Demo message is "Hello and welcome to LEXUS Link. For LEXUS Link services, contact a LEXUS Link advisor by pressing the SERVICES button again. For additional information, visit us on-line at Lexus.com in the owner section or talk to your LEXUS dealer."
    5. LED indicator functions
    LED INDICATOR FUNCTIONS CHART

    System Status LED Status (No DTC, Service Enabled) LED Status (No DTC, Service Disabled) LED Status (Current DTC, Service Enabled) LED Status (Current DTC, Service Disabled)
    Power up LEDs flash in sequence LEDs flash in sequence LEDs flash in sequence LEDs flash in sequence
    No call state Illuminates green Off Illuminates red Illuminates red
    User call state Blinking green Blinking green Blinking red Blinking red
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