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Air Conditioning Amplifier Communication Stop Mode: Procedure

WARNING: This page is about a different car, the 2011 Toyota Matrix. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK CAN BUS LINE FOR DISCONNECTION (AIR CONDITIONING AMPLIFIER BRANCH WIRE) 
    1. Turn the ignition switch off.
      Fig 1: Checking Air Conditioning Amplifier E8 & E73 Connector Terminals
      GTY290063Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *A for 2AZ-FE
      *B for 2ZR-FE
      *a Front view of wire harness connector:
      (to Air Conditioning Amplifier)
    2. Disconnect the air conditioning amplifier connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      FOR 2AZ-FE

      Tester Connection Switch Condition Specified Condition
      E8-2 (CANH) - E8-3 (CANL) Ignition switch off 54 to 69 Ω
      FOR 2ZR-FE

      Tester Connection Switch Condition Specified Condition
      E73-8 (CANH) - E73-9 (CANL) Ignition switch off 54 to 69 Ω

    NG → REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (AIR CONDITIONING AMPLIFIER BRANCH WIRE) 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (IG+, GND) 
    1. Disconnect the air conditioning amplifier connector.
      Fig 2: Checking Air Conditioning Amplifier E8 & E73 Connector Terminals
      GTY289964Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *A for 2AZ-FE
      *B for 2ZR-FE
      *a Front view of wire harness connector:
      (to Air Conditioning Amplifier)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR 2AZ-FE

      Tester Connection Condition Specified Condition
      E8-12 (GND) - Body ground Always Below 1 Ω
      FOR 2ZR-FE

      Tester Connection Condition Specified Condition
      E73-24 (GND) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      FOR 2AZ-FE

      Tester Connection Switch Condition Specified Condition
      E8-8 (IG+) - Body ground Ignition switch ON 10 to 14 V
      FOR 2ZR-FE

      Tester Connection Switch Condition Specified Condition
      E73-14 (IG+) - Body ground Ignition switch ON 10 to 14 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   3 

  3. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL 
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