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. Effects on each system when communication is impossible are shown in the table below. (For further details, see the pages for each system.)

      Function

      (Function Description)

      		 Control Master System Related Fail-safe Operation

      DTC

      (Driver Detectable)

      ABS control

      (Controls driving force while ABS in operation)

      		 Skid control ECU (brake actuator assembly)

      • ECM

      • Yaw rate and acceleration sensor

      ABS control is inoperative

      (ABS control gradually stops)

      U0073

      U0100

      U0124

      (Warning and indicator lights come on)

      TRC control

      (Engine power control by VSC/TRC)

      		 Skid control ECU (brake actuator assembly)

      • ECM

      • Yaw rate and acceleration sensor

      • Steering angle sensor (spiral cable with sensor sub-assembly)

      ABS/VSC control is inoperative

      (ABS/VSC control gradually stops)

      U0073

      U0100

      U0123

      U0124

      U0126

      (Warning and indicator lights come on)

      VSC control

      (Controls driving force while VSC in operation)

      		 Skid control ECU (brake actuator assembly)

      • ECM

      • Yaw rate and acceleration sensor

      • Steering angle sensor (spiral cable with sensor sub-assembly)

      ABS/VSC control is inoperative

      (ABS/VSC control gradually stops)

      U0073

      U0100

      U0123

      U0124

      U0126

      (Warning and indicator lights come on)

      Electric power steering control

      (Speed of vehicle induction type torque control)

      		 Power steering ECU assembly

      • ECM

      • Skid control ECU (brake actuator assembly)

      Depression of EPS assist

      (Deterioration of steering assist)

      U0100

      U0129

      (Warning light comes on)

      Air conditioning control

      (Air conditioning control in cabin)

      		 Air conditioning amplifier assembly

      • ECM

      • Combination meter assembly

      • Main body ECU (driver side junction block assembly)

      		 Air conditioning function and PTC heater function stop

      U0100

      U0131

      U0142

      U0155

      (Air conditioning is inoperative)
      Four wheel drive control AWD control ECU

      • ECM

      • Skid control ECU (brake actuator assembly)

      • Yaw rate and acceleration sensor

      • Steering angle sensor (spiral cable with sensor sub-assembly)

      • Main body ECU (driver side junction block assembly)

      • Air conditioning amplifier assembly

      		 Fixed torque distribution

      U0073

      U0100

      U0123

      U0124

      U0126

      U0129

      (Warning and indicator lights come on)

      Headlight swivel/Leveling control

      (Headlight control)

      		 AFS ECU

      • ECM

      • Skid control ECU (brake actuator assembly)

      • Steering angle sensor (spiral cable with sensor sub-assembly)

      • Main body ECU (driver side junction block assembly)

      Swivel control stops

      (Leveling control remains on)

      -

      (Indicator light blinks)
      Entry function/Power door lock control Certification ECU (smart key ECU assembly) Main Body ECU (driver side junction block assembly) Unlock permitted

      U0327

      U1002

      (Wireless door lock cannot operate)
      Air conditioning control (Controls air conditioning functions such as set temperature adjustment, air outlet selection, etc. using navigation receiver assembly or radio and display receiver assembly)

      • Navigation receiver assembly

      • Radio and display receiver assembly

      		 Air conditioning amplifier assembly

      • When set temperature is shown on multi-display, set temperature display turns off

      • Air conditioning function(s) are prohibited

      • A message indicating to check air conditioning amplifier connection appears on multi-display

      		 U0073
      Fuel consumption display (Displays graph of fuel consumption per minute and history of total fuel consumption)

      • Navigation receiver assembly

      • Radio and display receiver assembly

      • ECM

      • Combination meter assembly

      • Skid control ECU (brake actuator assembly)

      		 If a communication interruption occurs, values are not displayed

      U0100

      U0129

      U0155
      Destination Determination (Determines the destination based on the destination symbol and destination package information and selects the display language, time zone, etc.)

      • Navigation receiver assembly

      • Radio and display receiver assembly

      		 Main Body ECU (driver side junction block assembly) Determines the destination according to the last received value and operates accordingly (if there is no last received value, the system operates using the default value). U0140
      Outer mirror control Outer mirror control ECU assembly Main Body ECU (driver side junction block assembly) Operation of outer mirrors is prohibited U0142
      Seat position memory Position control ECU and switch assembly

      • ECM

      • Combination meter assembly

      • Main Body ECU (driver side junction block assembly)

      • Auto memory recall is prohibited

      • Memory is prohibited

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