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Home >> Toyota >> 2007 >> Prius Base >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Air Conditioning >> Air Conditioning System >> Back-up Power Source Circuit >> Inspection Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Inspection Procedure

  1. INSPECT FUSE (ECU-B) 
    1. Remove the ECU-B fuse from the driver side junction block.
    2. Measure the resistance of the fuse.

      Standard resistance: Below 1 Ω 

    NG : REPLACE FUSE 

    OK : GO TO NEXT STEP 

  2. CHECK AIR CONDITIONING AMPLIFIER (+B VOLTAGE) 
    1. Remove the air conditioning amplifier with connectors still connected.
    2. Measure the voltage of the wire harness side connector.

      Standard voltage 

      TERMINALS VOLTAGE SPECIFICATIONS

      Tester Connection Specified Condition
      A8-6 (+B) - Body ground 10 to 14 V

    OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

    Fig 1: Identifying Air Conditioning Amplifier Connectors
    G04475115Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : GO TO NEXT STEP 

  3. CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - BATTERY AND BODY GROUND) 
    1. Disconnect the A8 amplifier connector.
    2. Measure the voltage of the wire harness side connector.

      Standard voltage 

      TERMINALS VOLTAGE SPECIFICATIONS

      Tester Connection Specified Condition
      A8-6 (+B) - Body ground 10 to 14 V
    3. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TERMINALS RESISTANCE SPECIFICATIONS

      Tester Connection Specified Condition
      A8-1 (GND) - Body ground Below 1 Ω

    NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

    Fig 2: Disconnecting A8 Amplifier Connector
    G04475116Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : REPLACE AIR CONDITIONING AMPLIFIER 

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