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CAN COMMUNICATION SYSTEM FAIL-SAFE CHART

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  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 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 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 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)

      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)

      Air conditioning control

      (Air conditioning control is in 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)

      Four wheel drive control

      (for AWD)

      		 4WD control ECU

      • ECM

      • Skid control ECU

      • Yaw rate sensor

      • Steering angle sensor

      • Main body ECU

      • Air conditioning amplifier

      		 Fixed torque distribution

      U0073

      U0100

      U0123

      U0124

      U0126

      U0129

      (Warning and indicator lights come on)
      Air suspension control Suspension control ECU

      • ECM

      • Skid control ECU

      • Yaw rate sensor

      • AFS ECU

      		 Height control is set to "normal mode"

      U0100

      U0101

      U0122

      U0124

      U0126

      U0129

      U0182

      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)

      U0100

      U0101

      U0126

      U0129

      U0142

      (Indicator light come on)
      Entry function/Power door lock control Certification ECU Main Body ECU Unlock permitted

      U0327

      U1002
      Pre-crash safety system Seat belt control ECU

      • Skid control ECU

      • Driving support ECU

      • Main body ECU

      • Center airbag sensor assembly

      • Seat belt control ECU

      		 Pre-crash safety control is inoperative

      U0122

      U0140

      U0151

      U1104

      (Indicator light come on)

      Parking assist monitor system

      (w/ Side monitor system)

      		 Parking assist ECU

      • ECM

      • Skid control ECU

      • Steering angle sensor

      • Main body ECU

      		 Parking assist monitor will be inoperative

      U0073

      U0100

      U0126

      U0129

      U0140

      (Displays messages on the picture)

      Parking assist monitor system

      (w/o Side monitor system)

      		 Multi-media module receiver assembly

      • ECM

      • Skid control ECU

      • Steering angle sensor

      • Main body ECU

      		 Parking assist monitor will be inoperative

      U0100

      U0126

      U0129

      U0140

      (Displays messages on the picture)

      LEXUS parking assist-sensor system

      (w/o Side monitor system)

      		 Clearance warning ECU

      • ECM

      • Combination meter

      • Main body ECU

      		 Clearance sonar will be inoperative

      U0101

      U0155

      U0142

      (Clearance sonar is inoperative)
      Power back door Power back door ECU Main body ECU Power back door does not operate U0230
      Outer mirror control

      • Outer mirror control ECU LH

      • Outer mirror control ECU RH

      		 Main body ECU Outer mirrors do not operate

      U0142

      U0199

      U0200
      Power tilt and power telescopic steering column Multiplex tilt and telescopic ECU

      • Position control ECU

      • Main body ECU

      • Driving position memory function stop

      • Auto away/return function stop

      B2621

      B2624

      U0209

      U1115

      Audio and visual system

      (w/ Multi-display)

      		 Radio receiver assembly

      • ECM

      • Combination meter

      • Main body ECU

      • Clearance warning ECU

      • Air conditioning amplifier

      		 Multi-display will be inoperative

      U0073

      U0100

      U0129

      U0140

      U0155

      U1110