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Fail-Safe Chart [09/2014 - 10/2015]

  1. FAIL-SAFE FUNCTION 
    1. When communication fails in any of the CAN bus lines (communication lines), 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. The following table shows the effects on each system when communication is impossible. (For further details, see the appropriate information for each system.)
      Function Control Master System Related Fail-safe Operation Driver Detectable DTC Detection
      (ECU that stored DTC)
      Air Conditioning Control
      • Corrects engine speed, such as for idle up.
      • Controls outlet air temperature, outlet mode change and airflow volume based on engine coolant temperature signal.
      • Corrects engine coolant temperature map and changes compressor lock judgment value.
      		 Air conditioning amplifier assembly ECM Control is performed based on default coolant temperature of 80°C (176°F). - U0100
      (Air conditioning amplifier assembly)
      Compressor Control
      • Judges compressor lock according to engine speed.
      		 Air conditioning amplifier assembly ECM Control is performed based on default engine speed of 0 rpm. - U0100
      (Air conditioning amplifier assembly)
      Simple Load Control
      • Performs electric load control according to load control level signal.
      		 Air conditioning amplifier assembly Power steering ECU assembly Load control is not performed. - U0131
      (Air conditioning amplifier assembly)
      Panel Dimming Control
      • Outputs dimmer signal to LIN connected panels according to display dimmer signal.
      		 Air conditioning amplifier assembly Main body ECU (multiplex network body ECU) Dimming mode and non-dimming mode cannot be switched. - U0142
      (Air conditioning amplifier assembly)
      Destination Identification Control
      • Changes air conditioning control pattern according to destination.
      		 Air conditioning amplifier assembly Main body ECU (multiplex network body ECU) Maintains the latest state. - U0142
      (Air conditioning amplifier assembly)
      Insolation Correction Control
      • Corrects air conditioning system control operation according to value of solar sensor.
      		 Air conditioning amplifier assembly Main body ECU (multiplex network body ECU) Control is performed based on an insolation value of 0 after communication stop is confirmed. - U0142
      (Air conditioning amplifier assembly)
      Ambient Temperature Correction Control
      • Switches air conditioning system operation condition and corrects value of displayed ambient temperature according to vehicle speed signal.
      		 Air conditioning amplifier assembly Combination meter assembly Control is performed based on default vehicle speed of 0 km/h (0 mph).
      • Correction level for displayed ambient temperature declines.
      • Correction level for outlet airflow declines.
      		 U0155
      (Air conditioning amplifier assembly)
      Air Conditioning Eco Mode Control
      • Limits air conditioning system control.
      		 Air conditioning amplifier assembly ECM Maintains the latest state (Maintained in normal condition after reset). - U0100
      (Air conditioning amplifier assembly)
      Door Lock
      • Controls key linked and automatic door lock/unlock function, key confinement prevention function, etc.
      		 Main body ECU (multiplex network body ECU)
      • ECM
      • Combination meter assembly
      • Airbag ECU assembly
      • Speed sensitive automatic lock control does not occur.
      • Shift linked automatic lock control does not occur.
      • Automatic lock/ unlock cannot be changed.
      		 - U0100
      U0101
      U0151
      U0155
      (Main body ECU (multiplex network body ECU))
      Display Automatic Dimming
      • Display dimming control.
      		 Main body ECU (multiplex network body ECU) Combination meter assembly Automatic dimming control for displays does not operate when taillights are turned on. - U0155
      (Main body ECU (multiplex network body ECU))
      Luggage Compartment Door Opener/Luggage Compartment Door Open Control
      • Accepts luggage compartment door opener request.
      		 Main body ECU (multiplex network body ECU)
      • ECM
      • Combination meter assembly
      		 Luggage compartment door does not open. - U0100
      U0101
      U0155
      (Main body ECU (multiplex network body ECU))
      Illumination Control Main body ECU (multiplex network body ECU)
      • ECM
      • Certification ECU (smart key ECU assembly)
      • Interior lights turn off.
      • Footwell illumination is turned off.
      • Interior lights do not turn off right after getting out of the vehicle.
      		 - U0101
      U0327
      (Main body ECU (multiplex network body ECU))
      Seat and Mirror Control Main body ECU (multiplex network body ECU)
      • Position control ECU and switch assembly LH
      • Outer mirror control ECU assembly (for driver side)
      • Outer mirror control ECU assembly (for front passenger side)
      • Multiplex tilt and telescopic ECU
      • Combination meter assembly
      • Memory function does not operate.
      • Mirrors cannot be adjusted.
      		 - U0155
      U0199
      U0200
      U0208
      U1115
      (Main body ECU (multiplex network body ECU))
      Entry Function/Wireless Control Certification ECU (smart key ECU assembly) Main body ECU (multiplex network body ECU) Entry lock/unlock control is not possible. - U0327
      (Main body ECU (multiplex network body ECU))
      Engine System Indicator Display
      • Estimates whether injectors are clogged and requests that a message be displayed informing user that injectors need maintenance.
      • Estimates whether oil has deteriorated and requests that a message be displayed informing user that oil needs to be replaced.
      		 ECM Combination meter assembly
      • System is unable to inform user that oil needs to be replaced or injectors need maintenance.
      • Combination meter display cannot be cleared.
      • System is unable to inform user of brake override system control status.
      		 - -
      Electric Load Control
      • Performs idle up according to electric load.
      		 ECM
      • Air conditioning amplifier assembly
      • Power steering ECU assembly
      • Main body ECU (multiplex network body ECU)
      		 Idle up according to electric load is not performed. Not possible. (Idle speed changes.) -
      Air Conditioning Cooperative Operation
      • Performs idle up according to compressor load.
      • Performs air conditioning cut control.
      		 ECM Air conditioning amplifier assembly Air conditioning system does not use cooperative controls. (Idle up is not performed.) Air conditioning system does not operate. -
      Charge Control
      • Performs idle up according to charging request.
      		 ECM Air conditioning amplifier assembly Idle up according to charging request is not performed. Taillights flicker and blower airflow changes. -
      Eco Control
      • Adjusts throttle response in consideration of actual fuel economy.
      		 ECM Combination meter assembly Eco mode does not operate. - -
      ECT System Indicator Display
      • Meter display. (Displays shift position, states of switches, system modes, etc.)
      		 ECM Combination meter assembly Indicator light does not illuminate. - -
      Neutral Control
      • Reduces engine load and performs idle up.
      		 ECM
      • Skid control ECU (brake actuator assembly)
      • Yaw rate sensor
      		 Neutral control is not performed. - -
      Coast Downshift Timing Change According to Air Conditioning Load
      • Delays upshifts according to warm-up request.
      		 ECM Air conditioning amplifier assembly
      • Coast downshift does not occur.
      • Coast downshift shock reduction performance deteriorates.
      		 - -
      Cruise Control
      • Controls vehicle speed by adjusting throttle valve angle automatically.
      		 ECM
      • Skid control ECU (brake actuator assembly)
      • Driving support ECU assembly
      • Combination meter assembly
      		 Cruise control does not operate. Displays messages on the multi-information display. -
      Power Steering Control
      • Calculates assist current according to torque sensor value and vehicle speed and drives motor.
      		 Power steering ECU assembly
      • ECM
      • Skid control ECU (brake actuator assembly)
      • Yaw rate sensor
      • Steering sensor
      		 When communication with ECM is interrupted:
      • Power steering assist not provided.

      When communication with skid control ECU (brake actuator assembly) is interrupted:
      • Control continues based on a default speed of 100 km/h (62 mph) because vehicle speed cannot be determined. (Steering wheel feels heavy when the vehicle speed is below 100 km/h (62 mph) and feels light at speeds above 100 km/h (62 mph).)
      		 - U0100
      U0129
      (Power steering ECU assembly)
      VDIMα System
      • Calculates current to be used for steering assist according to commanded value from VSC, and then operates motor.
      • Skid control ECU (brake actuator assembly)
      • Power steering ECU assembly
      		 Skid control ECU (brake actuator assembly) VDIMα control is stopped. - -
      VDIMβ System
      • Calculates current to be used for steering assist according to commanded values from VSC, and then operates motor.
      • Skid control ECU (brake actuator assembly)
      • Power steering ECU assembly
      • Skid control ECU (brake actuator assembly)
      • Steering sensor
      		 VDIMβ control is stopped. EPS warning light illuminates. U0129
      (Power steering ECU assembly)
      Entry Function
      • Entry lock/unlock, entry luggage compartment open.
      • Warning.
      • Performs entry illumination (interior illumination, etc.)
      • Main body ECU (multiplex network body ECU)
      • Certification ECU (smart key ECU assembly)
      • Main body ECU (multiplex network body ECU)
      • Combination meter assembly
      • ECM
      		 Entry unlock is performed again.
      • Entry lock/ unlock or entry luggage compartment open does not operate.
      • Warning functions (Key confinement, Key not in vehicle, Key reminder etc.) do not operate, Key confinement prevention control does not operate.
      • Entry illumination does not operate.
      		 U0100
      U0142
      U0155
      (Certification ECU (smart key ECU assembly))
      Entry Function/Wireless Control Main body ECU (multiplex network body ECU)
      • Main body ECU (multiplex network body ECU)
      • Certification ECU (smart key ECU assembly)
      		 Entry lock/unlock control is not possible. - U0327
      (Main body ECU (multiplex network body ECU))
      Engine Switch Backlighting Control
      • Turns on/off engine switch illumination linked with interior lights etc.
      		 Certification ECU (smart key ECU assembly) Main body ECU (multiplex network body ECU) Engine switch backlighting does not illuminate according to interior lights operation. - U0142
      (Certification ECU (smart key ECU assembly))
      Security Indicator Display Function
      • Displays immobiliser and security status.
      		 Certification ECU (smart key ECU assembly) Main body ECU (multiplex network body ECU) Security indicator cannot display security status correctly. (Security indicator blinks or illuminates when in armed state or alarm sounding state.) - U0142
      (Certification ECU (smart key ECU assembly))
      Vehicle Speed Display Combination meter assembly Skid control ECU (brake actuator assembly)
      • Speedometer is controlled based on a default vehicle speed of 0 km/h (0 mph).
      • Drive monitor calculation is stopped.
      		 - U0129
      (Combination meter assembly)
      Tachometer Display Combination meter assembly ECM
      • Needle of tachometer remains at 0 rpm.
      • Drive monitor calculation is stopped.
      		 - U0100
      (Combination meter assembly)
      Engine Coolant Temperature Receiver Gauge Control Combination meter assembly ECM None Engine coolant temperature receiver gauge is at the middle or below. -
      Meter Display
      • Displays vehicle condition and controls indicator lights.
      		 Combination meter assembly
      • ECM
      • Skid control ECU (brake actuator assembly)
      • Airbag ECU assembly
      • Main body ECU (multiplex network body ECU)
      • Power steering ECU assembly
      • Headlight leveling ECU assembly
      • Driving support ECU assembly
      • Lane departure warning camera
      		 Lights do not illuminate or lights remain illuminated. Displays messages on the multi-information display. U0100
      U0129
      U0131
      U0142
      U0151
      U0182
      U023A
      U1104
      (Combination meter assembly)
      Buzzer
      • Controls sounding of buzzer for various functions.
      		 Combination meter assembly
      • Main body ECU (multiplex network body ECU)
      • Airbag ECU assembly
      • Skid control ECU (brake actuator assembly)
      • Power steering ECU assembly
      • ECM
      		 Buzzer stops sounding or does not sound. - U0100
      U0129
      U0131
      U0151
      U023A
      (Combination meter assembly)
      Destination Identification
      • Identifies destination based on destination and destination package information, and selects the time zone and language used for the display.
      		 Combination meter assembly Main body ECU (multiplex network body ECU) None - U0142
      (Combination meter assembly)
      Linking-up with Multi-information Display
      • Displays navigation, audio, telephone, etc.
      		 Combination meter assembly Radio receiver assembly None - U0163
      (Combination meter assembly)
      ABS Control Skid control ECU (brake actuator assembly) Yaw rate sensor When control is being performed:
      • When back-up control (vehicle behavior stabilization) is complete, braking returns to normal and further control is prohibited.

      When control is not being performed:
      • Control will not be started.
      • Brake warning light illuminates.
      • ABS warning light illuminates.
      • SLIP indicator illuminates.
      		 U0073
      U0124
      (Skid control ECU (brake actuator assembly))
      VSC/TRAC/VDIM Control Skid control ECU (brake actuator assembly)
      • ECM
      • Yaw rate sensor
      • Steering sensor
      		 When control is being performed:
      • When back-up control (vehicle behavior stabilization) is complete, braking returns to normal and further control is prohibited.

      When control is not being performed:
      • Control will not be started.
      • Brake warning light illuminates.
      • ABS warning light illuminates.
      • SLIP indicator illuminates.
      		 U0073
      U0100
      U0124
      U0126
      (Skid control ECU (brake actuator assembly))
      Hill-start Assist Control
      • Maintains the brake hydraulic pressure to the 4 wheels for 2 seconds with the brake pedal released when starting off on an uphill.
      		 Skid control ECU (brake actuator assembly)
      • ECM
      • Yaw rate sensor
      • Steering sensor
      		 Control cannot be performed.
      • Brake warning light illuminates.
      • ABS warning light illuminates.
      • SLIP indicator illuminates.
      		 U0073
      U0100
      U0124
      U0126
      (Skid control ECU (brake actuator assembly))
      Headlight Leveling Control (Headlight Control)
      • Adjusts headlights vertical aiming according to wheel speed and vehicle pitch angle determined using vehicle height sensor.
      • Headlight leveling ECU assembly (for Single Beam Headlight)
      • Headlight light control ECU sub-assembly LH (for Triple Beam Headlight)
      • Skid control ECU (brake actuator assembly)
      • Main body ECU (multiplex network body ECU)
      		 Headlight Leveling Control is stopped. - U0129
      U0142
      (Headlight leveling ECU assembly (for Single Beam Headlight))
      (Headlight light control ECU sub-assembly LH (for Triple Beam Headlight))
      Air Conditioning Control
      • Controls air conditioning functions such as set temperature adjustment, air outlet selection, etc. by operating LEXUS display audio controller or Remote Touch.
      		 Radio receiver assembly Air conditioning amplifier assembly
      • Air conditioning system indicators turn off.
      • If set temperature is shown on multi-information display or multi-display, set temperature display turns off.
      • Air conditioning functions are prohibited.
      		 Displays messages on the multi-information display. U0073
      U0164
      (Radio receiver assembly)
      Intuitive Parking Assist System Setting/Notification
      • Controls settings for clearance sonar screen notifications which are set by operating Remote Touch, displays sonar status and plays voice warnings.
      		 Radio receiver assembly
      • ECM
      • Clearance warning ECU assembly
      		 Display updating is stopped. - U0073
      U0100
      U1110
      (Radio receiver assembly)
      Fuel Consumption Display
      • Displays graph of fuel consumption per minute and history of total fuel consumption.
      		 Radio receiver assembly
      • ECM
      • Skid control ECU (brake actuator assembly)
      • Combination meter assembly
      		 When communication with ECM or skid control ECU is interrupted:
      • Display is not updated.

      When communication with combination meter is interrupted:
      • Display is not updated.
      • Numeric part of drivable mileage is cleared.
      		 - U0100
      U0129
      U0155
      (Radio receiver assembly)
      Destination Identification
      • Identifies destination based on destination and destination package information, and selects the time zone and language used for the display.
      		 Radio receiver assembly Main body ECU (multiplex network body ECU) Destination is identified based on information received before communication is interrupted. Time zone and language selection screen are different from actual destination. U0140
      (Radio receiver assembly)
      Time Stamp Function
      • Matches the relative time from the main body ECU with the absolute time acquired from the GPS.
      		 Radio receiver assembly Main body ECU (multiplex network body ECU) None - U0073
      U0140
      (Radio receiver assembly)
      Tire Pressure Monitoring System
      • Receives information from tire pressure warning ECU and receiver to display air pressure, tire location and system status.
      		 Radio receiver assembly Main body ECU (multiplex network body ECU) None - U0073
      (Radio receiver assembly)
      Power Tilt and Power Telescopic Steering Column Control
      • Starts steering wheel auto return or auto away based on an engine switch on/off signal or equivalent.
      • Memorizes and recalls selected driving position according to memory switch operation.
      • Moves steering wheel to selected position according to manual switch operation on steering column cover.
      		 Multiplex tilt and telescopic ECU
      • Main body ECU (multiplex network body ECU)
      • Position control ECU and switch assembly LH
      • Driving position memory function is prohibited.
      • Auto away/return function is prohibited.
      		 - U0142
      U0208
      (Multiplex tilt and telescopic ECU)
      Seat Position Memory System
      • Controls the seat position based on operation conditions.
      		 Position control ECU and switch assembly LH
      • Main body ECU (multiplex network body ECU)
      • ECM
      • Combination meter assembly
      • Multiplex tilt and telescopic ECU
      		 Controls the seat position based on operation conditions. - -
      Mirror Surface Adjustment
      • Outer mirror control ECU assembly (for driver side)
      • Outer mirror control ECU assembly (for front passenger side)
      		 Main body ECU (multiplex network body ECU) Mirror surface position cannot be memorized or recalled. - U0142
      (Outer mirror control ECU assembly)
      Mirror Heaters
      • Outer mirror control ECU assembly (for driver side)
      • Outer mirror control ECU assembly (for front passenger side)
      • Main body ECU (multiplex network body ECU)
      • Air conditioning amplifier assembly
      		 Mirror heaters do not operate. - U0142
      (Outer mirror control ECU assembly)
      Mirror Retract/Return Operation
      • Controls retract/return operation of the outer mirrors based on signals such as mirror switch signal from main body ECU (multiplex network body ECU).
      • Outer mirror control ECU assembly (for driver side)
      • Outer mirror control ECU assembly (for front passenger side)
      		 Main body ECU (multiplex network body ECU) Mirrors cannot be retracted or returned. - -
      Reverse-shift Linked Door Mirror Operation
      • Outer mirror control ECU assembly (for driver side)
      • Outer mirror control ECU assembly (for front passenger side)
      		 Main body ECU (multiplex network body ECU) Reverse-shift linked door mirror function does not operate. - U0142
      (Outer mirror control ECU assembly)
      Mirror Surface Position Memory and Recall
      • Outer mirror control ECU assembly (for driver side)
      • Outer mirror control ECU assembly (for front passenger side)
      		 Main body ECU (multiplex network body ECU) Mirror surface position cannot be memorized or recalled. - U0142
      (Outer mirror control ECU assembly)
      Seat Memory Switch Signal Forwarding
      • Transmits memory switch signal via the CAN bus.
      		 Main body ECU (multiplex network body ECU)
      • Outer mirror control ECU assembly (for driver side)
      • Outer mirror control ECU assembly (for front passenger side)
      		 Seat position memory settings cannot be memorized or recalled. - -
      Dynamic Radar Cruise Control System
      • Accelerates or decelerates the vehicle to maintain the distance to the vehicle ahead.
      		 Driving support ECU assembly
      • ECM
      • Yaw rate sensor
      • Steering sensor
      • Skid control ECU (brake actuator assembly)
      • Active cruise control is canceled.
      • Fail-safe function operates only during active cruise control.
      • Warning message is displayed or cruise control indicator illuminates (yellow) (when cruise control main switch is on).
      • Buzzer sounds (cycle: 0.2 sec., number of times buzzer sounds: 2).
      		 U0100
      U0125
      U0126
      U0129
      (Driving support ECU assembly)
      Pre-collision System
      • Controls the brakes immediately before a crash.
      		 Driving support ECU assembly
      • ECM
      • Yaw rate sensor
      • Steering sensor
      • Skid control ECU (brake actuator assembly)
      • Main body ECU (multiplex network body ECU)
      		 Control stops.
      • Displays messages on the multi-information display.
      • PCS indicator light flashes.
      		 U0100
      U0125
      U0129
      U0142
      (Driving support ECU assembly)
      Intuitive Parking Assist System Control
      • Judges vehicle speed.
      		 Clearance warning ECU assembly Combination meter assembly Obstacle detection is stopped. - U0155
      (Clearance warning ECU assembly)
      Shift Position Judgment
      • Uses received shift position signal as a clearance sonar detection operation condition.
      		 Clearance warning ECU assembly ECM Control operates with the default shift position (P). - U0101
      (Clearance warning ECU assembly)
      Voice Warning Availability Confirmation
      • Uses destination code and steering wheel information for determining availability of voice warning for clearance sonar.
      		 Clearance warning ECU assembly Main body ECU (multiplex network body ECU) Assumes that there is no voice warning. - -
      Lane Departure Alert System
      • Warns when vehicle is deviating from its lane.
      		 Lane departure warning camera
      • Main body ECU (multiplex network body ECU)
      • ECM
      • Combination meter assembly
      • Skid control ECU (brake actuator assembly)
      • Yaw rate sensor
      • Driving support ECU assembly
      		 Lane departure and buzzer warning are canceled. Displays messages on the multi-information display. U0101
      U0104
      U0123
      U0129
      U0142
      U0155
      (Lane departure warning camera)
      Automatic High Beam System
      • Controls high beam on/off.
      		 Lane departure warning camera
      • ECM
      • Main body ECU (multiplex network body ECU)
      • Skid control ECU (brake actuator assembly)
      • Yaw rate sensor
      		 Maintains the same condition. Displays messages on the multi-information display. U0101
      U0123
      U0129
      U0142
      (Lane departure warning camera)
      Blind Spot Monitor Control
      • Detects vehicle in blind spot of adjacent lane and informs driver.
      		 Blind spot monitor sensor LH
      • ECM
      • Skid control ECU (brake actuator assembly)
      • Steering sensor
      • Main body ECU (multiplex network body ECU)
      • Yaw rate sensor
      		 None Displays messages on the multi-information display. U0100
      U0125
      U0126
      U0129
      U0142
      (Blind spot monitor sensor LH)
      Parking Assist Monitor
      • Monitors the shift position signal, steering angle signal and vehicle speed, and displays the predicted path guide lines on the screen based on the steering angle when reversing.
      		 Rear television camera assembly
      • ECM
      • Steering sensor
      • Skid control ECU (brake actuator assembly)
      • Main body ECU (multiplex network body ECU)
      • Clearance warning ECU assembly
      • Radio receiver assembly
      • Power steering ECU assembly
      • Blind spot monitor sensor LH
      		 Parking assist monitor function is prohibited.
      • Predicted path guide lines are not displayed.
      • All guide lines, the clearance sonar icon and rear cross traffic alert icon are not displayed.
      		 U0100
      U0126
      U0129
      U0131
      U0140
      U0163
      U0233
      U1000
      U1110
      (Rear television camera assembly)
      ASC System
      • Outputs simulated engine sounds in accordance with vehicle driving condition.
      		 Stereo component equalizer assembly
      • Main body ECU (multiplex network body ECU)
      • Skid control ECU (brake actuator assembly)
      • ECM
      		 Simulated engine sound output is stopped. - U0100
      U0129
      U0142
      (Stereo component equalizer assembly)
      Torque Vectoring Differential System
      • Distributes drive force to the right and left wheels.
      		 Torque vectoring differential ECU assembly
      • ECM
      • Power steering ECU assembly
      • Steering sensor
      • Skid control ECU (brake actuator assembly)
      • Yaw rate sensor
      		 Torque vectoring differential function is prohibited. Displays messages on the multi-information display. U0100
      U0122
      U0123
      U0126
      U0131
      (Torque vectoring differential ECU assembly)
      Torque Vectoring Differential System Operation Permission/Prohibition Judgment
      • Torque vectoring differential ECU assembly
      • Skid control ECU (brake actuator assembly)
      		 Skid control ECU (brake actuator assembly) Torque vectoring differential function is prohibited. Displays messages on the multi-information display. U1172
      (Torque vectoring differential ECU assembly)
      Torque Vectoring Differential System Mode and Drive Force Meter Display Torque vectoring differential ECU assembly Combination meter assembly Torque vectoring differential system mode and drive force meter display is not displayed on the multi-information display. - -
      Rear Wing Automatic Operation Spoiler control ECU assembly
      • Skid control ECU (brake actuator assembly)
      • TCM
      • Main body ECU (multiplex network body ECU)
      • When U0101 is detected: If detected during rise/retract operation, the spoiler will be controlled by a mode other than ECO mode after the operation is complete.
      • When U0129 is detected: If detected during rise/retract operation, the motor will be stopped after the operation is complete.
      • When U0142 is detected: If detected during rise/retract operation, the motor will be stopped immediately.
      		 - U0101
      U0129
      U0142
      (Spoiler control ECU assembly)
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