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Home >> Toyota >> 2011 >> Highlander Hybrid Limited >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication System (W/O Smart Key) (Diagnostic Codes & Circuit Tests) (Hybrid) >> CAN COMMUNICATION SYSTEM (w/o Smart Key System) >> Air Conditioning Amplifier Communication Stop Mode >> Procedure

Air Conditioning Amplifier Communication Stop Mode: Procedure

  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and CAN branch wire.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      NOTE:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected, refer to INITIALIZATION .

    NEXT: Go to next step 

  2. CHECK FOR OPEN IN CAN BUS WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY CAN BRANCH WIRE) 
    1. Disconnect the D37 air conditioning amplifier assembly connector.
      Fig 1: Disconnecting D37 Air Conditioning Amplifier Assembly Connector
      GTY301094Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      D37-11 (CANH) - D37-12 (CANL) Ignition switch off 54 to 69 Ω
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Air Conditioning Amplifier Assembly)

    NG → REPAIR OR REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY CAN BRANCH WIRE OR CONNECTOR (CANH, CANL) 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - BATTERY AND BODY GROUND) 
    1. Connect the cable to the negative (-) battery terminal.
      Fig 2: Disconnecting D37 Air Conditioning Amplifier Assembly Connector
      GTY300528Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected, refer to INITIALIZATION .

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D37-14 (GND) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      D37-1 (IG+) - Body ground Ignition switch ON 11 to 14 V
      D37-21 (B) - Body ground Always 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Air Conditioning Amplifier Assembly)

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   4 

  4. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL 
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