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Terminals Of Ecu

  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY 
    1. Disconnect the D47 air conditioning amplifier assembly connector.
      Fig 1: Identifying D47 Air Conditioning Amplifier Assembly Connector Terminals
      G06029006Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 DESCRIPTION AND SPECIFIED CONDITION

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      D47-1 (IG+) - D47-14 (GND) Y - W Power source (IG) Ignition switch ON 11 to 14 V
      D47-1 (IG+) - D47-14 (GND) Y - W Power source (IG) Ignition switch off Below 1 V
      D47-21 (B) - D47-14 (GND) V - W Power source (Back-up) Always 11 to 14 V
      D47-14 (GND) - Body ground W - Body ground Ground Always Below 1 Ω

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

    3. Reconnect the D47 air conditioning amplifier assembly connector.
    4. Measure the voltage and check for pulses according to the value(s) in the table below.
      TERMINAL DESCRIPTION AND SPECIFIED CONDITION

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      D47-18 (D) - D47-14 (GND) G - W Rear defogger signal Ignition switch ON, rear window defogger switch off 11 to 14 V
      D47-18 (D) - D47-14 (GND) G - W Rear defogger signal Ignition switch ON, rear window defogger switch on Below 1 V
      D47-37 (LIN1) - D47-14 (GND) SB - W LIN communication line Ignition switch ON Pulse generation

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

  2. CHECK AIR CONDITIONING CONTROL ASSEMBLY 
    1. Disconnect the E3 air conditioning control assembly connector.
      Fig 2: Identifying E3 Air Conditioning Control Assembly Connector Terminals
      G06029007Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 DESCRIPTION AND SPECIFIED CONDITION

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      E3-4 (IG+) - E3-5 (GND) GR - W Power source (IG) Ignition switch ON 11 to 14 V
      E3-4 (IG+) - E3-5 (GND) GR - W Power source (IG) Ignition switch off Below 1 V
      E3-5 (GND) - Body ground W - Body ground Ground Always Below 1 Ω

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

    3. Reconnect the E3 air conditioning control assembly connector.
    4. Check for pulses according to the value(s) in the table below.
      TERMINAL DESCRIPTION AND SPECIFIED CONDITION

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      E3-2 (LIN1) - E3-5 (GND) SB - W LIN communication line Ignition switch ON Pulse generation

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

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