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Terminals Of Ecu

WARNING: This page is about a different car, the 2006 Lexus GS 430 and 2006 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
  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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