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Fail-Safe Chart

WARNING: This page is about a different car, the 2009 Toyota Sequoia. 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 main wires (communication lines) 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 table below shows the effects on each system when communication is impossible. For further details, refer to each system.
      FAIL-SAFE CHART

      Function (Function Description) Control Master ECU Related ECU or Sensor Vehicle Behavior Indicator and Buzzer
      Memory Call
      (Driver Seat, Mirror, Tilt and Telescopic)      		 Power seat control ECU
      • Outer Mirror Control ECU
      • Multiplex Tilt and Telescopic ECU
      • Main Body ECU
      • ECM
      • Combination Meter ECU
      		 Stop memory call function Nothing
      Retractable Mirror Outer Mirror Control ECU Main Body ECU Stop Retractable function Nothing
      Door Mirror Foot Light Outer Mirror Control ECU Main Body ECU Stop door mirror foot light function Nothing
      Tilt and Telescopic: Auto Away/ Return Multiplex Tilt and Telescopic ECU
      • Power seat control ECU
      • Main Body ECU
      		 Stop auto away/ return function Nothing
      Power Back Door Power Back Door ECU
      • Main Body ECU
      • ECM
      • Combination Meter ECU
      • Bus Buffer ECU
      		 Stop power back door function Stop "Power Back Door Buzzer"
      Alarm Main Body ECU Bus Buffer ECU Not influenced Nothing
      Door Lock Linked Speed Main Body ECU
      • Combination Meter ECU
      • Bus Buffer ECU
      		 Not possible to link with speed or shift Nothing
      Illumination Main Body ECU Combination Meter ECU Change status of illumination Nothing
      Power Window Main Body ECU Bus Buffer ECU Not influenced Nothing
      DRL Main Body ECU ECM DRL does not illuminate Nothing
      Main Body ECU Buzzer Function Main Body ECU Power Back Door ECU Stop some buzzer function Stop "Power Back Door Buzzer"
      Observation Function of MS Bus Communication Failure Main Body ECU
      • Power seat control ECU
      • Outer Mirror Control ECU
      • Multiplex Tilt and Telescopic ECU
      • Power Back Door ECU
      		 Not influenced Nothing
      Engine Control ECM - Not influenced Light on "MIL"(1)
      Normal Brake Skid Control ECU - Not influenced Nothing
      ABS, VSC Skid Control ECU
      • ECM
      • Steering Angle Sensor
      • 4WD Control ECU
      • Stop ABS operation
      • Stop VSC operation
      • Stop traction control
      • Light on "VSC Warning Light"
      • Light on "Slip Indicator Light"
      • Light on "ABS Warning Light"
      • Light on "Brake Warning Light"
      Meter Buzzer Function Combination Meter ECU
      • Main Body ECU
      • ECM
      • Skid Control ECU
      • Center Airbag Sensor
      		 Stop some buzzer function
      • Stop "Key Reminder Buzzer"
      • Stop "Seat Belt Warning Buzzer"
      • Stop "Parking Brake ON Drive Warning Buzzer"
      • Stop "Half-open Warning Buzzer"
      • Stop "4WD Buzzer"
      • Stop "Slide Roof Buzzer"
      • Stop "Sports Shift Reject Buzzer"
      • Stop "Leader Cruise Buzzer"
      Meter Indicator Function Combination Meter ECU
      • Power Steering Control ECU
      • Main Body ECU
      • ECM
      • Skid Control ECU
      • Center Airbag Sensor
      • 4WD Control ECU
      		 Does not illuminate or always illuminates
      • Light on "Airbag Warning Light"
      • Light on "BRAKE Warning Light"
      • Light on "ABS Warning Light"
      • Light on "PS Warning Light"
      Data Recorder Center Airbag Sensor
      • ECM
      • Combination Meter ECU
      		 Stop recording Light on "ABS Warning Light"
      A/C Air Conditioning Amplifier
      • Main Body ECU
      • ECM
      • Combination Meter ECU
      		 Stop air conditioning Nothing
      Remote Start Bus Buffer ECU Main Body ECU Not possible to control by wireless Nothing
      4WD 4WD Control ECU
      • ECM
      • Skid Control ECU
      • Combination Meter ECU
      • Air Conditioning Amplifier
      		 Not possible to change between 4WD and 2WD Nothing
      Air Suspension Suspension Control ECU
      • ECM
      • Skid Control ECU
      • Steering Angle Sensor
      • 4WD Control ECU
      		 Not influenced Nothing
      Power Steering Power Steering ECU
      • ECM
      • Skid Control ECU
      • Steering Angle Sensor
      		 Stop assist steering Light on "PS Warning Light"
      Laser Cruise Control Distance Control ECU
      • ECM
      • Skid Control ECU
      		 Stop laser cruise control
      • Indicate at Multi Display
      • Light on "Master caution indicator"
      • Sound "Laser Cruise Buzzer"
      (1) MIL lights on only during VSC or ABS failure status.
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