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Terminals Of Ecu

  1. CHECK CLEARANCE WARNING ECU 
    1. Disconnect the M2 ECU connector.
      Fig 1: Identifying M2 ECU Connector Terminals
      G05253396Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance and voltage between each terminal of the wire harness side connector.
      ECU CONNECTOR TERMINAL DESCRIPTION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      CLSW(M2-1)-E(M2-21) Y-W-B Clearance sonar main switch signal Engine switch off Below 1 V
      Engine switch on (IG), clearance sonar main switch ON 10 to 14 V
      IG(M2-10)-E(M2-21) B-W-B IG signal / IG power source signal Engine switch off Below 1 V
      Engine switch on (IG) 10 to 14 V
      E(M2-21)-Body ground W-B - Body ground ECU ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the M2 ECU connector.
    4. Measure the resistance and voltage according to the value(s) in the table below.
      ECU CONNECTOR TERMINAL DESCRIPTION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      L1(M2-2)-E(M2-21) P-W-B Clearance sonar main switch indicator signal Engine switch on (IG), clearance sonar main switch OFF 10 to 14 V
      Engine switch on (IG), clearance sonar main switch ON Below 1 V
      BOR(M2-7)-E(M2-21) L-W-B Rear sensor circuit power source Engine switch off Below 1 V
      Engine switch on (IG) 7 to 9V
      BOF(M2-9)-E(M2-21) V-W-B Front sensor circuit power source Engine switch off Below 1 V
      Engine switch on (IG) 7 to 9V
      CBZ(M2-12)-E(M2-21) W-W-B Clearance warning buzzer signal Buzzer not sounding Below 1V
      Buzzer sounding Waveform 1
      E2(M2-22)-E(M2-21) G-W-B Rear sensor circuit ground Always Below 1 Ω
      E1(M2-24)-E(M2-21) GR - W-B Front sensor circuit ground Always Below 1 Ω

      If the result is not as specified, the ECU may have a malfunction.

    5. Reference:
      1. Waveform 1
        ITEM CONTENT DESCRIPTION

        Item Content
        Symbols (Terminal No.) CBZ (M2-12) - E (M2-21)
        Tool Setting 2 V/DIV., 1 msec./DIV.
        Condition Buzzer sounding
        Fig 2: Waveform 1 Graph
        G05253397Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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