CAN COMMUNICATION SYSTEM FAIL-SAFE CHART


  1. FAIL-SAFE FUNCTION


    1. The fail-safe function is designed to prevent malfunctions in various systems by switching the systems to fail-safe modes specified for each system, if communication fails in any of the CAN bus lines (communication lines) due to a short circuit or other causes.

    2. Effects on each system when communication is impossible (for further details, see the pages for each system):

      Function ECM Air Conditioning Amplifier Action when communication is impossible DTC detection (Driver detectable)
      Compressor control (Air conditioning control = cooling, heating and dehumidification) Tx Rx Air conditioning function (cooling and dehumidification) stops. (Compressor stops.) None (Light does not come on.)
      PTC heater control (Heating control) Tx Rx Heating function stops. (PTC heater drive stops.) None (Light does not come on.)

      Tech Tips


      • Tx: Transmission to each ECU

      • Rx: Reception from each ECU