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. (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

      • 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

      • ECM

      • Yaw rate and acceleration sensor

      • Steering angle sensor

      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

      • ECM

      • Yaw rate and acceleration sensor

      • Steering angle sensor

      ABS/VSC control is inoperative

      (ABS/VSC control gradually stops)

      U0073

      U0100

      U0123

      U0124

      U0126

      (Warning and indicator lights come on)

      Cooperative control

      (VSC with EPS-VSC integrated control)

      		 Skid control ECU

      • Power steering ECU

      • Steering angle sensor

      Vehicle speed sensitive control is inoperative

      (Control is performed with assist force equivalent to that of driving at 70 km/h (43 mph))

      U0073

      (Warning light comes on)

      Electric power steering control

      (Speed of vehicle induction type torque control)

      		 Power steering ECU

      • ECM

      • Skid control ECU

      Depression of EPS assist

      (Deterioration of steering assist)

      U0100

      U0129

      (Warning light comes on)

      Headlight swivel/Leveling control

      (Headlight control)

      		 AFS ECU

      • ECM

      • Skid control ECU

      • Steering angle sensor

      • Main body ECU

      Swivel control stops

      (Leveling control remains on)

      B2427

      (Indicator light blinks)

      Air conditioning control

      (Air conditioning control is cabin)

      		 Air conditioning amplifier

      • ECM

      • Combination meter

      • Main body ECU

      • Power steering ECU

      		 Air conditioning function and PTC heater function stop

      (99)

      U0100

      U0131

      U0142

      U0155

      (Air conditioning is inoperative)

      Clearance sonar control

      (Inform that an obstacle is detected)

      		 Clearance warning ECU

      • ECM

      • Combination Meter

      • Main Body ECU

      		 Clearance sonar control does not operate

      U0101

      U0142

      U0155

      (Clearance sonar is inoperative)
      Entry function/Power door lock control Certification ECU (Smart key ECU assembly) Main Body ECU Unlock permitted

      U0327

      U1002

      (Wireless door lock cannot operate)