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Fail-Safe Chart

WARNING: This page is about a different car, the 2008 Scion xB. However, it is still accessible from the selected car via links, so may be relevant.
  1. FAIL-SAFE FUNCTION 
    1. When communication fails in any of the CAN bus wires (communication wires) due to a short circuit or other causes, the fail-safe function, which is specified for each system, operates to prevent the system from malfunctioning.
    2. The following chart shows the relationships between components, system functions, and effects of communication failure on these functions. (For further details, see the information for each system.)
      FAIL-SAFE FUNCTION CHART

      Function
      (Function Description)      		 Control Master System Related Fail-safe Operation DTC
      (Driver Detectable)
      VSC control
      (Controls driving force while VSC in operation)      		 Skid Control ECU
      • ECM
      • Steering Angle Sensor
      • Yaw Rate Sensor
      		 VSC control is inoperative
      (VSC control gradually stops)      		 U0073, U0100, U0123, U0124, U0126, U0129
      (Warning Light comes on)
      TRC control
      (Engine power control by VSC/TRC)      		 Skid Control ECU
      • ECM
      • Steering Angle Sensor
      • Yaw Rate Sensor
      		 TRC control is inoperative
      (TRC control gradually stops)      		 U0073, U0100, U0123, U0124, U0126, U0129
      (Warning Light comes on)
      ABS control
      (Control driving force while ABS in operation)      		 Skid Control ECU Yaw Rate Sensor Control inoperative
      (gradually stops controlling during ABS control)      		 U0073, U0123, U0124, C0371
      (Warning light comes on)
      Electric power steering
      (Speed of vehicle induction type torque control)      		 Power Steering ECU
      • ECM
      • Skid Control ECU
      • Steering Angle Sensor
      • Combination Meter
      		 Stopping or depression of EPS assist
      (Deterioration of steering)      		 U0100, U0129
      (VSC failure warning light comes on)
      (ECM failure Assist stopping/decrease of assist)
      Meter display (Vehicle status display and indicator light control) Combination Meter
      • ECM
      • Skid Control ECU
      • Power Steering ECU
      • Accessory Bus Buffer
      • Center Airbag Sensor Assembly
      • Air Conditioning Amplifier
      • Main Body ECU
      		 Always turning on the light or always turning off the light U0100, U0129
      (Abnormal light illumination)
      Air conditioning control Air Conditioning Amplifier
      • ECM
      • Accessory Bus Buffer
      • Combination Meter
      • Main Body ECU
      		 Air conditioning function stop B1499
      (Air Conditioning inoperative)
      Neutral control ECM Skid Control ECU Neutral control stops U0129
      (Not detectable)
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