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Terminals Of Ecu

  1. CHECK AIR CONDITIONING AMPLIFIER 
    Fig 1: Identifying Air Conditioning Amplifier Connector Terminals
    G05655914Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the H24 air conditioning amplifier connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      WINDOW DEFOGGER SYSTEM

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      H24-1 (IG+) - H24-14 (GND) P - W-B Ignition power supply Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      H24-21 (B) - H24-14 (GND) R - W-B Battery power source Always 11 to 14 V
      H24-14 (GND) - Body ground W-B - Body ground 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 H24 air conditioning amplifier connector.
    4. Measure the voltage according to the value(s) in the table below.
      WINDOW DEFOGGER SYSTEM

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      H24-11 (CANH) - H24-14 (GND) B - W-B Hi-level CAN bus line Ignition switch ON Pulse generation (see  e waveform 1)
      H24-12 (CANL) - H24-14 (GND) W - W-B Lo-level CAN bus line Ignition switch ON Pulse generation (see  f waveform 2)
      H24-37 (LIN1) - H24-14 (GND) SB - W-B LIN communication signal Ignition switch ON Pulse generation
      H24-38 (RDEF) - H24-14 (GND) R - W-B Defogger relay Ignition switch ON Defogger switch OFF 11 to 14 V
      Ignition switch ON Back door window closed Defogger switch ON Below 1 V

      If the result is not as specified, the air conditioning amplifier may have a malfunction.

    5. Waveform 1 (Reference): Using an oscilloscope

      CAN Communication Signal 

      WAVEFORM REFERENCE CHART

      Terminal Name CANH - GND
      Tester Range 1 V/DIV., 10 μsec./DIV.
      Condition Ignition switch ON

      HINT:

      The waveform varies depending on the CAN communication signal.

      Fig 2: CAN Communication Signal Oscilloscope Waveform Graph 1
      G05655915Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Waveform 2 (Reference): Using an oscilloscope

      CAN Communication Signal 

      WAVEFORM REFERENCE CHART

      Terminal Name CANL - GND
      Tester Range 1 V/DIV., 10 μ sec./DIV.
      Condition Ignition switch ON

      HINT:

      The waveform varies depending on the CAN communication signal.

      Fig 3: CAN Communication Signal Oscilloscope Waveform Graph 2
      G05655916Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK INTEGRATION CONTROL AND PANEL 
    Fig 4: Identifying Integration Control And Panel Connector Terminals
    G05655917Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the H45 integration control and panel connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      TERMINAL DESCRIPTION CHART

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      H45-16 (IG+) - H45-1 (GND) P - W-B Ignition power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      H45-1 (GND) - Body ground W-B - Body ground 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 H45 integration control and panel connector.
    4. Measure the voltage according to the value(s) in the table below.
      TERMINAL DESCRIPTION CHART

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      H45-3 (STX) - H45-1 (GND) SB - W-B LIN communication circuit Ignition switch ON Pulse generation

      If the result is not as specified, the integration control and panel may have a malfunction.

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