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Terminals Of Ecu [12/2019 - 11/2023]

  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY 
    Fig 1: Check Air Conditioning Amplifier Assembly [12/2019 - 11/2023]
    GTY899295Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a This connector is not used by the climate control seat system. Refer to Air Conditioning System. - -
    1. Disconnect the H62 air conditioning amplifier assembly connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.

      HINT: 

      Measure the values on the wire harness side with the connector disconnected.

      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      H62-6 (IG+) - H62-17 (GND) IG power supply Ignition switch off Below 1 V
      H62-6 (IG+) - H62-17 (GND) IG power supply Ignition switch ON 11 to 14 V
      H62-5 (B) - H62-17 (GND) Auxiliary battery power supply Ignition switch off*1
      Always*2      		 11 to 14 V
      H62-17 (GND) - Body ground Ground Always Below 1 Ω
      1. *1: for HV Model
      2. *2: for Gasoline Model
    3. Reconnect the H62 air conditioning amplifier assembly connector.
    4. Check for pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      H62-14 (LOUT) - Body ground Climate control blower control signal
      • Ignition switch ON
      • Climate control switch (Air conditioning control assembly) (for LH) on (blower position)
      		 Pulse generation
      (See waveform)
      H62-13 (ROUT) - Body ground Climate control blower control signal
      • Ignition switch ON
      • Climate control switch (Air conditioning control assembly) (for RH) on (blower position)
      		 Pulse generation
      (See waveform)
      H62-7 (LIN1) - Body ground Climate control switch signal Ignition switch ON Pulse generation
      1. Waveform (Reference):
        GTY432174Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        MEASUREMENT CONDITION

        Item Content
        Tester Connection
        • H62-14 (LOUT) - Body ground
        • H62-13 (ROUT) - Body ground
        Tool Setting 1 V/DIV., 0.5 ms/DIV.
        Vehicle Condition
        • Ignition switch ON
        • Climate control switch (Air conditioning control assembly) on (blower position)
  2. CLIMATE CONTROL SWITCH (AIR CONDITIONING CONTROL ASSEMBLY) 
    GTY915155Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the H27 Climate control switch (Air conditioning control assembly) connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.

      HINT: 

      Measure the values on the wire harness side with the connector disconnected.

      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      H27-4 (IG+) - H27-8 (E)*1 IG power supply Ignition switch off Below 1 V
      H27-6 (IG+) - H27-10 (GND)*2
      H27-4 (IG+) - H27-8 (E)*1 IG power supply Ignition switch ON 11 to 14 V
      H27-6 (IG+) - H27-10 (GND)*2
      H27-8 (E) - Body ground*1 Ground Always Below 1 Ω
      H27-10 (GND) - Body ground*2
      1. *1: for 12.3 Inch Display
      2. *2: for 8 Inch Display
    3. Reconnect the H27 Climate control switch (Air conditioning control assembly) connector.
    4. Check for pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      H27-3 (LIN1) - H27-8 (E)*1 B - Body ground Climate control switch signal Ignition switch ON Pulse generation
      H27-8 (LIN1) - H27-10 (GND)*2
      1. *1: for 12.3 Inch Display
      2. *2: for 8 Inch Display
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