CAN COMMUNICATION SYSTEM FAIL-SAFE CHART


  1. FAIL-SAFE FUNCTION


    1. When communication fails in any of the CAN bus wires (communication wires), a fail-safe function(s) will operate. The fail-safe function that is specified for each system operates to prevent those systems from malfunctioning.

    2. The following table shows the effects on each system when communication is impossible. (For further details, see the pages for each system.)

      Function

      (Function Description)

      		 Control Master System Related Fail-safe Operation

      DTC

      (Driver Detectable)

      Power switch

      (Power source control)

      		 Power management control ECU

      • Transmission control ECU

      • Skid control ECU

      • Main body ECU

      • Power switch does not change to on (READY) even when power switch is pressed with the brake pedal depressed

      • Power switch off is prohibited

      U0129

      U0293

      (Warning and indicator lights come on)
      Hybrid driving control Power management control ECU ECM Only motor operation is used (Engine is not used)

      U0100

      (Warning and indicator lights come on)
      Shift position indicator display Transmission control ECU

      • Power management control ECU

      • Main body ECU

      • Combination meter

      		 Shift position indicator is not displayed

      U0146

      (Warning and indicator lights come on)
      Regenerative braking control Power management control ECU Skid control ECU

      Regenerative braking will stop

      (ABS/VSC control gradually stops)

      U0073

      U0129

      U0293

      (Warning and indicator lights come on)

      VSC control

      (Controls driving force while VSC operating)

      		 Skid control ECU

      • Power management control ECU

      • Yaw rate sensor

      • Steering angle sensor

      ABS/VSC control is inoperative

      (ABS/VSC control gradually stops)

      U0073

      U0123

      U0124

      U0126

      U0293

      (Warning and indicator lights come on)

      ABS control

      (Controls driving force while ABS operating)

      		 Skid control ECU Yaw rate sensor

      ABS control is inoperative

      (ABS control gradually stops)

      U0073

      U0123

      U0124

      (Warning and indicator lights come on)

      TRC control

      (Engine power control by VSC/TRC)

      		 Skid control ECU

      • Power management control ECU

      • Yaw rate sensor

      • Steering angle sensor

      ABS/VSC control is inoperative

      (ABS/VSC control gradually stops)

      U0073

      U0123

      U0124

      U0126

      U0293

      (Warning and indicator lights come on)

      Electric power steering control

      (Speed of vehicle induction type torque control)

      		 Power steering ECU

      • Power management control ECU

      • Skid control ECU

      Depression of EPS assist

      (Deterioration of steering assist)

      U0129

      U0293

      (Warning light comes on)

      Air conditioning control

      (Air conditioning control is in cabin)

      		 Air conditioning amplifier

      • Power management control ECU

      • ECM

      • Combination meter

      • Main body ECU

      		 Air conditioning function and PTC heater function stop

      U0100

      U0142

      U0155

      U0293

      (Air conditioning is inoperative)
      Entry function/Power door lock control

      • Certification ECU

      • Main Body ECU

      • ECM

      • Combination meter

      • Power management control ECU

      • Center airbag sensor

      		 Unlock permitted

      U0100

      U0101

      U0142

      U0151

      U0155

      U0293

      U0327

      U1133

      (Wireless door lock cannot operate)
      Vehicle-to-vehicle distance control Driving support ECU

      • Power management control ECU

      • Skid control ECU

      • ECM

      • Steering angle sensor

      • Yaw rate sensor

      • Main body ECU

      		 Vehicle-to-vehicle distance control does not operate

      U0122

      U0123

      U0126

      U0293

      (Warning and indicator lights come on)

      Navigation Eco display


      • Displays fuel consumption per minute and regeneration amount in chart and displays history of average fuel economy

      • Navigation ECU Sub-assembly*1

      • Radio and Display Receiver Assembly*2

      • Power management control ECU

      • Skid control ECU

      • ECM

      • Combination meter

      On the navigation Eco screen:


      • Update of the perminute fuel consumption display (per minute fuel consumption calculation) on the navigation Eco screen (per-minute fuel consumption screen) is stopped

      • Update of the current average fuel economy display on the navigation Eco screen (block fuel consumption screen) is stopped

      • If drivable mileage is displayed on the navigation Eco screen (block fuel consumption screen), the numeric part of the drivable mileage disappears because drivable mileage data cannot be received

      U0100

      U0155

      U0293

      (None)

      Energy monitor display


      • Creates energy flow screen which indicates regeneration status and drive force transmission status

      • Navigation ECU Sub-assembly*1

      • Radio and Display Receiver Assembly*2

      		 Power management control ECU Energy flow is not displayed

      U0100

      U0293

      (None)

      Parking assist monitor control


      • Displays rear view monitor based on steering sensor, vehicle speed and vehicle information

      • Navigation ECU Sub-assembly*1

      • Radio and Display Receiver Assembly*2

      • ECM

      • Power steering ECU

      • Power management control ECU

      • Skid control ECU

      • Main body ECU

      		 Message is shown indicating that guide lines cannot be displayed.

      U0100

      U0126

      U0140

      U0293

      (None)

      Destination identification


      • Identifies destination based on destination and destination package information, and selects the time zone and language used for the display

      • Navigation ECU Sub-assembly*1

      • Radio and Display Receiver Assembly*2

      		 Main body ECU Destination is identified based on information received before communication is interrupted.

      U0140

      (None)

      Vehicle customization function


      • Allows changing of operation and control conditions for vehicle functions via multidisplay operation

      • Navigation ECU Sub-assembly*1

      • Radio and Display Receiver Assembly*2

      • Certification ECU

      • Main body ECU

      • Air conditioning amplifier

      		 When an application that uses remote communication is activated (customization/ remote diagnosis), the process will be performed regardless of main body ECU remote communication permit/ prohibit state

      U0073

      (None)

      Time stamp function


      • Diagnostic function that links relative time information from the main body ECU (multiplex network body ECU) and absolute time (actual time) obtained from GPS

      • Navigation ECU Sub-assembly*1

      • Main body ECU

      		 - -

      U0073

      (None)

      Rear view monitor control


      • Displays rear view monitor (without guide lines)

      • Navigation ECU Sub-assembly*1

      • Radio and Display Receiver Assembly*2

      • Main body ECU

      • Power management control ECU

      		 Screen does not change to camera display.

      U0100

      (None)
      Pre-crash safety system Driving support ECU

      • Power management control ECU

      • Skid control ECU

      • Steering angle sensor

      • Yaw rate sensor

      • Seat belt control ECU

      • Combination meter

      • Main body ECU

      		 Pre-crash safety control is inoperative

      U0122

      U0123

      U0126

      U0142

      U0293

      U1104

      U1100

      (Warning and indicator lights come on)
      Seat belt control ECU

      • Skid control ECU

      • Driving support ECU

      • Center airbag sensor

      • Main body ECU

      		 Pre-crash safety control is inoperative

      U0122

      U0140

      U0151

      U1104

      (Warning and indicator lights come on)
      Intelligent parking guidance system Parking assist ECU

      • Power management control ECU

      • EPS ECU

      • Skid control ECU

      • Steering angle sensor

      • Main body ECU

      • Air conditioning amplifier

      		 Intelligent parking assist is inoperative

      U0073

      U0100

      U0126

      U0129

      U0131

      U0140

      U0293

      C164A

      Tech Tips


      • *1: for Navigation receiver type

      • *2: for Radio and display type