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Home >> Lexus >> 2021 >> ES 350 Luxury >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Collision/Avoidance >> Dynamic Radar Cruise Control System (Except Hybrid) - Diagnostics - Introduction >> DYNAMIC RADAR CRUISE CONTROL SYSTEM (for Gasoline Model) >> Terminals Of Ecu [08/2020 - 08/2021] >> Terminals Of Ecu [08/2020 - 08/2021]

Terminals Of Ecu [08/2020 - 08/2021]

  1. CHECK ECM (for 2GR-FKS) 
    Fig 1: ECM Connector End View
    GTY825054Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT: 

    As a waterproof connector is used for the ECM, voltage, resistance and waveform inspections cannot be performed. The voltage, resistance and waveform values are provided for reference only.

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    A25-27 (STP) - C32-53 (E1) SB - W-B Stop light switch signal Brake pedal depressed 7.5 to 14 V
    Brake pedal released Below 1.5 V
    A25-42 (ST1-) - C32-53 (E1) LG - W-B Stop light switch signal Engine switch on (IG), brake pedal depressed 0 to 1.5 V
    Engine switch on (IG), brake pedal released 7.5 to 14 V
    A25-41 (CCS) - C32-53 (E1) R - W-B Steering pad switch circuit Cruise control switch not pushed 1 MΩ or higher
    Cruise control main switch pushed Below 2.5 Ω
    CANCEL switch pushed 228 to 252 Ω
    +RES switch pushed 599 to 661 Ω
    -SET switch pushed 1463 to 1617 Ω
  2. CHECK ECM (for A25A-FKS) 
    Fig 2: Terminals Of ECU
    GTY955032Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT: 

    As a waterproof connector is used for the ECM, voltage, resistance and waveform inspections cannot be performed. The voltage, resistance and waveform values are provided for reference only.

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    A28-21 (STP) - A28-10 (E1) SB - W-B Stop light switch signal Brake pedal depressed 7.5 to 14 V
    Brake pedal released Below 1.5 V
    A28-22 (ST1-) - A28-10 (E1) LG - W-B Stop light switch signal Engine switch on (IG), brake pedal depressed 0 to 1.5 V
    Engine switch on (IG), brake pedal released 7.5 to 14 V
    A28-27 (CCS) - A28-28 (ECCS) R - BE Steering pad switch circuit Cruise control switch not pushed 1 MΩ or higher
    Cruise control main switch pushed Below 2.5 Ω
    CANCEL switch pushed 228 to 252 Ω
    +RES switch pushed 599 to 661 Ω
    -SET switch pushed 1463 to 1617 Ω
  3. CHECK FORWARD RECOGNITION CAMERA 
    NOTE:
    • Turning the engine switch on (IG) with connectors disconnected may cause DTCs to be stored. Make sure to clear the DTCs after inspection has been performed.
    • Do not apply excessive force to the forward recognition camera connector.
    Fig 3: Forward Recognition Camera Connector End View
    GTY792756Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      P5-3 (LKSW) - P5-10 (GND) BE - LA Steering pad switch assembly signal (distance control signal) Engine switch on (IG), steering pad switch assembly (vehicle-to-vehicle distance control switch) on Below 1 V
      Engine switch on (IG), steering pad switch assembly (vehicle-to-vehicle distance control switch) off 4.75 to 5.25 V
      P5-10 (GND) - Body ground LA - Body ground Ground Always Below 1 Ω
      P5-7 (IGB) - P5-10 (GND) LA-P - LA Power source Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
    2. Check for pulses according to the value(s) in the table below.

      HINT: 

      If the waveform is not similar to that shown in the illustration, a malfunction of a CAN bus line, terminating resistor, or the forward recognition camera is suspected.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      P5-6 (CANH) - P5-10 (GND) B - LA CAN communication signal Engine switch on (IG) Pulse generation
      (See waveform 1)
      P5-12 (CANL) - P5-10 (GND) W - LA Pulse generation
      (See waveform 2)
      P5-5 (CA1P) - P5-10 (GND) L - LA Pulse generation
      (See waveform 1)
      P5-11 (CA1N) - P5-10 (GND) W - LA Pulse generation
      (See waveform 2)
      1. WAVEFORM 1
        Fig 4: Waveform 1
        GTY799268Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        Item Content
        Tester Connection
        • Between P5-6 (CANH) and P5-10 (GND)
        • Between P5-5 (CA1P) and P5-10 (GND)
        Tool Setting 1 V/DIV., 10 μs/DIV.
        Condition Engine switch on (IG)

        HINT: 

        The waveform varies depending on the CAN communication signal.

      2. WAVEFORM 2
        Fig 5: Waveform 2
        GTY806061Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        Item Content
        Tester Connection
        • Between P5-12 (CANL) and P5-10 (GND)
        • Between P5-11 (CA1N) and P5-10 (GND)
        Tool Setting 1 V/DIV., 10 μs/DIV.
        Condition Engine switch on (IG)

        HINT: 

        The waveform varies depending on the CAN communication signal.

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