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Home >> Toyota >> 2012 >> Highlander Hybrid >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Air Conditioning (Automatic) (Diagnostic Codes & Circuit Tests) (Hybrid) >> AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System) >> DTC B1499/99: Multiplex Communication Circuit >> Procedure

DTC B1499/99: Multiplex Communication Circuit: Procedure

  1. CHECK CAN COMMUNICATION SYSTEM 
    1. Using the Techstream, check if the CAN communication system is functioning normally.
      Result Proceed to
      CAN DTC is not output A
      CAN DTC is output (w/ Smart Key System) B
      CAN DTC is output (w/o Smart Key System) C

    B → See step   2 

    C → See step   4 

    A → See step   3 

  2. GO TO CAN COMMUNICATION SYSTEM. Refer to  DIAGNOSIS SYSTEM 
  3. USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
  4. GO TO CAN COMMUNICATION SYSTEM. Refer to  DIAGNOSIS SYSTEM 
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