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Terminals Of Ecu

  1. CHECK DISTANCE CONTROL ECU 
    Fig 1: Identifying Distance Control ECU Connector Terminals
    GTY138235Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    A8-1 (B) - A8-12 (GND) P - GR Battery Always 10 to 14 V
    A8-8 (CANH) - A8-12 (GND) GR- GR CAN communication signal CAN communication circuit Pulse generation
    A8-9 (CANL) - A8-12 (GND) BR - GR CAN communication signal CAN communication circuit Pulse generation
    A8-10 (SGND) - Body ground W-B - Body ground Ground Always Below 1 Ω
    A8-12 (GND) - Body ground GR - Body ground Ground Always Below 1 Ω
    A8-13 (IGB) - A8-12 (GND) V - GR Engine switch on signal Engine switch off Below 1 V
    A8-13 (IGB) - A8-12 (GND) V - GR Engine switch on signal Engine switch on (IG) 10 to 14 V
    A8-22 (LRDD) - A8-10 (SGND) L - W-B Millimeter wave radar sensor input signal Engine switch on (IG) Pulse generation
    (see waveform 1)
    A8-23 (LRRD) - A8-10 (SGND) G - W-B Millimeter wave radar sensor output signal Engine switch on (IG) Pulse generation
    (see waveform 2)
    A8-16 (MODE) - A8-12 (GND) Y - GR Steering pad switch signal (Distance control switch signal) Engine switch on (IG), Steering pad switch signal ON 0 to 2 V
    A8-16 (MODE) - A8-12 (GND) Y - GR Steering pad switch signal (Distance control switch signal) Engine switch on (IG), Steering pad switch signal OFF 10 to 14 V
    1. Reference: waveform 1
      Fig 2: Identifying Reference Voltage Waveform
      GTY108290Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Contents
      Terminal LRDD - SGND
      Tool setting 2 V/DIV., 10 msec./DIV.
      Vehicle condition Engine switch on (IG)
    2. Reference: waveform 2
      Fig 3: Identifying Reference Voltage Waveform
      GTY102659Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Contents
      Terminal LRRD - SGND
      Tool setting 2 V/DIV., 5 msec./DIV.
      Vehicle condition Engine switch on (IG)
  2. CHECK ECM 
    Fig 4: View Of A10 And B12 Terminals
    GTY137650Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    A10-27 (TC) - B12-81 (E1) P - W-B Ground Engine switch on (IG) 10 to 14 V
    A10-27 (TC) - B12-81 (E1) P - W-B Ground Connect terminals TC and CG of DLC3 Below 1 V
    A10-35 (ST1-) - B12-81 (E1) GR - W-B Stop light signal Engine switch on (IG), Brake pedal depressed (Stop light switch on) Below 1 V
    A10-35 (ST1-) - B12-81 (E1) GR - W-B Stop light signal Engine switch on (IG), Brake pedal released (Stop light switch off) 10 to 14 V
    A10-36 (STP) - B12-81 (E1) W - W-B Stop light signal Engine switch on (IG), Brake pedal released (Stop light switch off) Below 1 V
    A10-36 (STP) - B12-81 (E1) W - W-B Stop light signal Engine switch on (IG), Brake pedal depressed (Stop light switch on) 10 to 14 V
    A10-37 (CCHG) - B12-81 (E1) R - W-B Distance control switch signal Engine switch on (IG), Cruise control main switch on, MODE switch on Below 1 V
    A10-37 (CCHG) - B12-81 (E1) R - W-B Distance control switch signal Engine switch on (IG), Cruise control main switch on, MODE switch off 10 to 14 V
    A10-38 (LGND) - Body ground BR - Body ground Ground Always Below 1 Ω
    A10-40 (CCS) - B12-81 (E1) GR - W-B Cruise control main switch signal Engine switch on (IG) 10 to 14 V
    A10-40 (CCS) - B12-81 (E1) GR - W-B Cruise control main switch signal Engine switch on (IG), CANCEL switch on 6.6 to 10.1 V
    A10-40 (CCS) - B12-81 (E1) GR - W-B Cruise control main switch signal Engine switch on (IG), - (COAST)/SET switch on 4.5 to 7.1 V
    A10-40 (CCS) - B12-81 (E1) GR - W-B Cruise control main switch signal Engine switch on (IG), + (ACCEL)/RES (RESUME) switch on 2.3 to 4.0 V
    A10-40 (CCS) - B12-81 (E1) GR - W-B Cruise control main switch signal Engine switch on (IG), Main switch on Below 1 V
    B12-81 (E1) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

  3. CHECK MILLIMETER WAVE RADAR SENSOR 
    Fig 5: Identifying A31 Connector Terminals
    GTY127122Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Symbols (Terminals No.) Wiring Color Terminal Description Condition Specified Condition
    A31-1 (LGND) - Body ground BR - Body ground Ground (Distance signal) Always Below 1 Ω
    A31-2 (SGND) - Body ground BR - Body ground Ground Always Below 1 Ω
    A31-3 (LRDD) - A31-2 (SGND) L - BR Millimeter wave radar sensor output signal Engine switch on (IG) Pulse generation
    (see waveform 1)
    A31-4 (LRRD) - A31-2 (SGND) G - BR Millimeter wave radar sensor input signal Engine switch on (IG) Pulse generation
    (see waveform 2)
    A31-5 (IGB) - A31-2 (SGND) V - BR Power source Engine switch on (IG) 10 to 14 V
    1. Reference: waveform 1
      Fig 6: Identifying Reference Voltage Waveform
      GTY108290Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Contents
      Terminal LRDD - SGND
      Tool setting 2 V/DIV., 10 msec./DIV.
      Vehicle condition Engine switch on (IG)
    2. Reference: waveform 2
      Fig 7: Identifying Reference Voltage Waveform
      GTY102659Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Contents
      Terminal LRDD - Body ground
      Tool setting 2 V/DIV., 10 msec./DIV.
      Vehicle condition Engine switch on (IG)
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