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Terminals Of Ecu

  1. CHECK DISTANCE CONTROL ECU 
    Fig 1: Identifying Distance Control ECU Connector Terminals
    G04024033Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    SYMBOLS AND SPECIFIED CONDITION CHART

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    K13-1 (B) - K13-12 (GND) L - G Battery Always 10 to 16 V
    K13-8 (CANH) - K13-12 (GND) BR- G CAN communication signal CAN communication circuit Pulse generation
    K13-9 (CANL) - K13-12 (GND) GR- G CAN communication signal CAN communication circuit Pulse generation
    K13-10 (SGND) - Body ground B - Body ground Ground Always Below 1 Ω
    K13-12 (GND) - Body ground G - Body ground Ground Always Below 1 Ω
    K13-13 (IGB) - K13-12 (GND) R - G Engine switch on signal Engine switch off Below 2 V
    K13-13 (IGB) - K13-12 (GND) R - G Engine switch on signal Engine switch on (IG) 10 to 16 V
    K13-22 (LRDD) - K13-10 (SGND) O - B Millimeter wave radar sensor input signal Engine switch on (IG) Pulse generation (see waveform 1)
    K13-23 (LRRD) - K13-10 (SGND) LG - B Millimeter wave radar sensor output signal Engine switch on (IG) Pulse generation (see waveform 2)
    K13-16 (MODE) - K13-12 (GND) W - G Steering pad switch signal (Distance control switch signal) Engine switch on (IG), Steering pad switch signal ON 0 to 2 V
    K13-16 (MODE) - K13-12 (GND) W - G Steering pad switch signal (Distance control switch signal) Engine switch on (IG), Steering pad switch signal OFF 9 to 16 V
    1. Reference: waveform 1

      HINT:

      • Terminal: LRDD - SGND
      • Gauge set: 2 V/DIV., 10 msec./DIV.
      • Condition: Engine switch on (IG)
        Fig 2: Identifying Reference Voltage Waveform
        G04024034Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Reference: waveform 2

      HINT:

      • Terminal: LRRD - SGND
      • Gauge set: 2 V/DIV., 5 msec./DIV.
      • Condition: Engine switch on (IG)
  2. CHECK ECM 
    Fig 3: Identifying Reference Voltage Waveform
    G04049263Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 4: Identifying ECM SGND Connector Terminals
    G04024036Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    SYMBOLS AND SPECIFIED CONDITION CHART

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    A7-4 (STP) - E7-7 (E1) R-B - BR Stop light signal Brake pedal release (Stop light switch OFF) Below 1 V
    A7-4 (STP) - E7-7 (E1) R-B - BR Stop light signal Brake pedal depressed (Stop light switch ON) 10 to 14 V
    A7-31 (CCS) - E7-7 (E1) L-B - BR Cruise control main switch signal Engine switch on (IG) 10 to 16 V
    A7-31 (CCS) - E7-7 (E1) L-B - BR Cruise control main switch signal CANCEL switch ON 6.6 to 10.1 V
    A7-31 (CCS) - E7-7 (E1) L-B - BR Cruise control main switch signal SET/COAST switch ON 4.5 to 7.1 V
    A7-31 (CCS) - E7-7 (E1) L-B - BR Cruise control main switch signal RES/ACC switch ON 2.3 to 4.0 V
    A7-31 (CCS) - E7-7 (E1) L-B - BR Cruise control main switch signal Main switch ON Below 1 V
    A6-8 (ST1-) - E7-7 (E1) G-W - BR Stop light signal Engine switch on (IG), Brake pedal depressed (Stop light switch ON) Below 1 V
    A6-8 (ST1-) - E7-7 (E1) G-W - BR Stop light signal Engine switch on (IG), Brake pedal released (Stop light switch OFF) 10 to 14 V
    A6-20 (CCHG) - E7-7 (E1) R-L - BR Distance control switch signal Engine switch on (IG), Cruise control main switch ON, MODE switch ON Below 1 V
    A6-20 (CCHG) - E7-7 (E1) R-L - BR Distance control switch signal Engine switch on (IG), Cruise control main switch ON, MODE switch OFF 10 to 14 V
    A6-29 (LGND) - Body ground L-B - Body ground Ground Always Below 1 Ω
    E7-7 (E1) - Body ground BR - Body ground Ground Always Below 1 Ω

    If the value is not within the standard range, the ECM may have a malfunction.

  3. CHECK MILLIMETER WAVE RADAR SENSOR 
    Fig 5: Identifying Millimeter Wave Radar Sensor Connector Terminals
    G04024037Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    SYMBOLS AND SPECIFIED CONDITION CHART

    Symbols (Terminals No.) Wiring Color Terminal Description Condition Specified Condition
    B8-1 (LGND) - Body ground L-B - Body ground Ground (Distance signal) Always Below 1 Ω
    B8-2 (SGND) - Body ground BR - Body ground Ground Always Below 1 Ω
    B8-3 (LRDD) - B8-2 (SGND) G - BR Millimeter wave radar sensor output signal Engine switch on (IG) Pulse generation (see waveform 1)
    B8-4 (LRRD) - B8-2 (SGND) LG - BR Millimeter wave radar sensor input signal Engine switch on (IG) Pulse generation (see waveform 2)
    B8-5 (IGB) - B8-2 (SGND) R - BR Power source Engine switch on (IG) 10 to 14 V
    1. Reference: waveform 1

      HINT:

      • Terminal: LRDD - SGND
      • Gauge set: 2 V/DIV., 10 msec./DIV.
      • Condition: Engine switch on (IG)
        Fig 6: Identifying Reference Waveform 1
        G04024038Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Reference: waveform 2

      HINT:

      • Terminal: LRRD - SGND
      • Gauge set: 2 V/DIV., 5 msec./DIV.
      • Condition: Engine switch on (IG)
        Fig 7: Identifying Reference Voltage Waveform
        G04049263Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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