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Home >> Lexus >> 2021 >> ES 350 Luxury >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> Safety Connect System (Except Hybrid) - Diagnostics - Introduction >> SAFETY CONNECT SYSTEM (for Gasoline Model) >> Terminals Of Ecu [10/2019 - 09/2022] >> Terminals Of Ecu [10/2019 - 09/2022]

Terminals Of Ecu [10/2019 - 09/2022]

  1. CHECK DCM (TELEMATICS TRANSCEIVER) 
    Fig 1: Terminals Of ECU
    GTY960682Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    G128-1 (+B) - G128-20 (E) BR - W-B Power source (+B) Always 11 to 14 V
    G128-3 (SIG-) - G128-20 (E) B - W-B Ground Always Below 1 V
    G128-4 (IND1) - G128-20 (E) LG - W-B Manual (SOS) switch red indicator illumination signal For 2 seconds after turning the engine switch on (IG) 1 to 8.5 V
    Engine switch off Below 1 V
    G128-5 (MCVD) - G128-20 (E) B - W-B Telephone microphone assembly power supply Engine switch on (ACC) 4 to 6 V
    Engine switch off Below 1 V
    G128-6 (MCI+) - G128-20 (E) W - W-B Receive microphone voice signal Voice being input to telephone microphone assembly A waveform synchronized with microphone voice signal is input
    G128-7 (MCI-) - G128-20 (E) R - W-B Receive microphone voice signal Always Below 1 V
    G128-13 (GSW) - G128-20 (E) Y - W-B Collision detection signal Engine switch on (IG) Pulse generation (Refer to waveform1)
    G128-19 (IG2) - G128-20 (E) P - W-B Power source (IG) Engine switch on (IG) 11 to 14 V
    Engine switch off Below 1 V
    G128-20 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω
    G128-21 (SIG1) - G128-3 (SIG-) R - G Manual (SOS) switch button condition signal Manual (SOS) switch not pressed 1.3 to 1.9 V
    Manual (SOS) switch pressed 0.5 to 0.8 V
    G128-22 (IND2) - G128-20 (E) G - W-B Manual (SOS) switch green indicator illumination signal For 2 seconds after turning the engine switch on (IG) 1 to 8.5 V
    Engine switch off Below 1 V
    G128-23 (SGND) - G128-20 (E) Shielded - W-B Shield ground Always Below 1 Ω
    G128-25 (CANP) R CAN communication signal - -
    G128-26 (CANN) W CAN communication signal - -
    1. Oscilloscope waveform:
      Fig 2: Waveform 1
      GTY424726Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Waveform 1
        Item Condition
        Tester connection G128-13 (GSW) - G128-20 (E)
        Tool setting 5.0 V/DIV., 20 ms/DIV.
        Vehicle condition Engine switch on (IG)
  2. CHECK RADIO RECEIVER ASSEMBLY 

    w/o Navigation System: Refer to TERMINALS OF ECU [06/2018 - 08/2021] , or refer to TERMINALS OF ECU [08/2021 - 09/2022]

    w/ Navigation System: Refer to TERMINALS OF ECU [06/2018 - 08/2021] , or refer to TERMINALS OF ECU [08/2021 - 09/2022]