CAN COMMUNICATION SYSTEM FAIL-SAFE CHART


  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 pages for each system.)

      Function

      Control Master

      (Main ECU to determine controls)

      		 System Related Fail-safe Operation Driver Detectable

      DTC Detection

      (ECU that stored DTC)

      Regenerative Operation


      • Provides maximum amount of regeneration based on cooperative control with the ECB system.

      		 Hybrid vehicle control ECU Brake booster with master cylinder assembly Normal driving Master warning light illuminates.

      U117087

      (Hybrid vehicle control ECU)

      Drive Torque Control


      • Controls the generator (MG1) and motor (MG2).

      		 Hybrid vehicle control ECU Inverter with converter assembly Normal driving Master warning light illuminates.

      U011087

      (Hybrid vehicle control ECU)

      Drive Torque Control


      • Controls the ECB.

      • Cruise Control.

      		 Hybrid vehicle control ECU Brake booster with master cylinder assembly Normal driving Master warning light illuminates.

      U012987

      (Hybrid vehicle control ECU)

      Shift Control


      • Certification ECU (smart key ECU assembly) (Controls power supply change function)

      		 Hybrid vehicle control ECU Certification ECU (smart key ECU assembly) (Power supply change function) Automatic P position change function does not operate. Displays messages on the multi-information display.

      U110787

      (Hybrid vehicle control ECU)

      Normal Charge Control


      • Charges the vehicle using AC power from a general household outlet or public charging station.

      		 Hybrid vehicle control ECU

      • Electric vehicle charger assembly

      • Battery ECU assembly

      		 Control stops.

      • MIL illuminates.

      • Displays messages on the multi-information display.

      U115087

      (Electric vehicle charger assembly)

      Timer Charging Control


      • Controls the time at which charging starts or completes as specified by the user.

      		 Electric vehicle charger assembly

      • Meter circuit plate

      • Navigation receiver assembly

      • Radio and display receiver assembly

      • Hybrid vehicle control ECU

      		 Charging is performed immediately. (Charging is not performed when the HV battery is fully charged.) -

      U015587

      (Electric vehicle charger assembly)

      Auxiliary Power Supply


      • Supplies power generated by the solar charging system to auxiliary electrical loads.

      		 Solar energy control unit Hybrid vehicle control ECU Solar charging stops. Displays messages on the multi-information display.

      U115087

      (Solar energy control unit)

      HV Battery Charging


      • Charges the HV battery using power generated by the solar charging system.

      		 Solar energy control unit

      • Hybrid vehicle control ECU

      • Battery ECU assembly

      • Certification ECU (smart key ECU assembly)

      		 Solar charging stops. Displays messages on the multi-information display.

      U011187

      U115087

      (Solar energy control unit)

      Motor/Generator Control


      • Controls the motor and generator by calculating the optimum voltage and current based on the requested torque value and the rotation angles of the motor and generator.

      • Inverter with converter assembly

      • Hybrid vehicle control ECU

      • ECM

      • Hybrid vehicle control ECU

      • Brake booster with master cylinder assembly

      • When the brake booster with master cylinder assembly is not communicating:

        Normal driving possible (regeneration is not performed)

      • When an ECU other than the brake booster with master cylinder assembly is not communicating:

        Normal driving possible

      • Master warning light turns on.

      • MIL illuminates.

      U010087

      U029387

      U117087

      (Inverter with converter assembly)

      Battery Control


      • Calculates the battery charge and discharge capacity.

      		 Battery ECU assembly

      • Hybrid vehicle control ECU

      • ECM

      		 Control is performed the same as when the HV battery is not installed to the vehicle.

      • Master warning light turns on.

      • MIL illuminates.

      U010087

      U029387

      U115087

      (Battery ECU assembly)

      Anti-lock Brake System Control


      • Helps prevent wheel lockup during sudden stops.

      		 Brake booster with master cylinder assembly Airbag sensor assembly Control is permitted.

      • Brake warning light illuminates.

      • ABS warning light illuminates.

      • Slip indicator light illuminates.

      U0073

      U0124

      (Brake booster with master cylinder assembly)

      Vehicle Stability Control / Traction Control


      • Suppresses vehicle instability, such as sliding sideways when cornering and wheel slippage when accelerating from rest.

      		 Brake booster with master cylinder assembly

      • Inverter with converter assembly

      • Airbag sensor assembly

      • Steering sensor

      • Hybrid vehicle control ECU

      		 Control cannot be performed.

      • Brake warning light illuminates.

      • ABS warning light illuminates.

      • Slip indicator light illuminates.

      U0073

      U0110

      U0293

      (Brake booster with master cylinder assembly)

      • During control: When back-up control (vehicle behavior stabilization) is complete, braking returns to normal and further control is prohibited.

      • Not during control: Control will not be started.

      • Brake warning light illuminates.

      • ABS warning light illuminates.

      • Slip indicator light illuminates.

      U0073

      U0124

      U0126

      (Brake booster with master cylinder assembly)

      Regenerative Brake Coordinate Control


      • Attempts to increase the amount of energy recovered by coordinating control with the electronically controlled brake system.

      		 Brake booster with master cylinder assembly

      • Inverter with converter assembly

      • Certification ECU (smart key ECU assembly)

      • Airbag sensor assembly

      • Hybrid vehicle control ECU

      		 Regenerative brake coordination control is stopped immediately.

      • Brake warning light illuminates.

      • Slip indicator light illuminates.

      U0110

      U0120

      U0293

      (Brake booster with master cylinder assembly)

      During control: When normal control is complete, hybrid vehicle regenerative brake coordinated control is prohibited.

      Not during control: Control will not be started.

      • Brake warning light illuminates.

      • ABS warning light illuminates.

      • Slip indicator light illuminates.

      U0124

      (Brake booster with master cylinder assembly)

      During control: Control is continued with previous values and then the brake pedal control amount is gradually changed. Then, hybrid vehicle regenerative brake coordinated control is prohibited.

      Not during control: Control will not be started.

      • Brake warning light illuminates.

      • ABS warning light illuminates.

      • Slip indicator light illuminates.

      U0073

      U0124

      (Brake booster with master cylinder assembly)

      Occupant Classification System


      • Acquires information about passengers for deployment of SRS components.

      		 Airbag sensor assembly Occupant detection ECU SRS components do not deploy. SRS warning light illuminates.

      U0154

      (Airbag sensor assembly)
      Vehicle Speed Display Meter circuit plate Brake booster with master cylinder assembly Speedometer is controlled based on a default vehicle speed of 0 km/h (0 mph). -

      U0129

      (Meter circuit plate)

      Odometer and trip meter display


      • Displays the driving distance.

      		 Meter circuit plate Brake booster with master cylinder assembly The last displayed value remains. -

      U0129

      (Meter circuit plate)

      Fuel Gauge


      • Displays the fuel gauge fuel level.

      • Turns the remaining fuel amount warning on and off.

      		 Meter circuit plate

      • ECM

      • Brake booster with master cylinder assembly

      		 - -

      U0129

      (Meter circuit plate)

      Reverse Warning Buzzer


      • Sounds the reverse warning buzzer.

      		 Meter circuit plate Hybrid vehicle control ECU - -

      U0293

      (Meter circuit plate)

      Door Half Latch Warning


      • Sounds/stops sounding the door half latch warning buzzer.

      • Turns on/off the door half latch warning indicator light.

      		 Meter circuit plate

      • Brake booster with master cylinder assembly

      • Main body ECU (multiplex network body ECU)

      		 - -

      U0129

      (Meter circuit plate)

      Seat Belt Warning


      • Sounds/stops sounding the seat belt warning buzzer.

      		 Meter circuit plate

      • Brake booster with master cylinder assembly

      • Main body ECU (multiplex network body ECU)

      • Airbag sensor assembly

      • Hybrid vehicle control ECU

      		 - -

      U0129

      U0151

      U0293

      (Meter circuit plate)

      Seat Belt Warning


      • Turns on/off the seat belt warning indicator light.

      		 Meter circuit plate

      • Brake booster with master cylinder assembly

      • Main body ECU (multiplex network body ECU)

      • Airbag sensor assembly

      • Hybrid vehicle control ECU

      		 - -

      U0129

      U0151

      U0293

      (Meter circuit plate)

      EPS Warning Buzzer


      • Turns the electronic power steering warning buzzer on and off.

      		 Meter circuit plate Power steering ECU assembly - Electronic power steering warning buzzer sounds.

      U0131

      (Meter circuit plate)

      Excess Speed Warning


      • Sounds/stops sounding the excess speed warning buzzer.

      • Turns on/off the excess speed warning indicator light.

      		 Meter circuit plate Brake booster with master cylinder assembly - -

      U0129

      (Meter circuit plate)

      Driving with Parking Brake Applied Warning Buzzer


      • Sounds or stops the driving with parking brake applied warning buzzer.

      		 Meter circuit plate

      • Brake booster with master cylinder assembly

      • Main body ECU (multiplex network body ECU)

      		 - -

      U0129

      (Meter circuit plate)

      Airbag


      • Turns the SRS warning light on and off.

      		 Meter circuit plate Airbag sensor assembly - SRS warning light illuminates.

      U0151

      (Meter circuit plate)

      ABS Warning


      • Turns the ABS warning light on and off.

      		 Meter circuit plate Brake booster with master cylinder assembly - ABS warning light illuminates.

      U0129

      (Meter circuit plate)

      PCS


      • Displays or does not display pre-crash safety system information.

      		 Meter circuit plate

      • Brake booster with master cylinder assembly

      • Driving support ECU assembly

      		 - Displays messages on the multi-information display.

      U0129

      U1104

      (Meter circuit plate)

      LDA


      • Displays or does not display lane departure alert system information.

      		 Meter circuit plate Forward recognition camera - Displays messages on the multi-information display.

      U023A

      (Meter circuit plate)

      Brake Warning


      • Turns the brake warning light on and off.

      • Turns the brake system buzzer on and off.

      • Turns the brake fluid warning light on and off.

      • Turns the brake fluid warning buzzer on and off.

      		 Meter circuit plate Brake booster with master cylinder assembly - Brake warning light illuminates.

      U0129

      (Meter circuit plate)

      MIL


      • Illuminates or turns off MIL.

      		 Meter circuit plate ECM - MIL illuminates.

      U0100

      (Meter circuit plate)

      Electronic Power Steering Warning


      • Turns the electronic power steering warning light on and off.

      		 Meter circuit plate Power steering ECU assembly - EPS warning light illuminates.

      U0131

      (Meter circuit plate)

      Headlight System


      • Turns operation and warning lights on/off.

      		 Meter circuit plate

      • Main body ECU (multiplex network body ECU)

      • No. 1 headlight ECU sub-assembly LH

      		 While the power switch on (IG), the current state is maintained. -

      U0182

      (Meter circuit plate)

      Slip Warning


      • Turns the slip warning light on and off.

      		 Meter circuit plate Brake booster with master cylinder assembly - Slip indicator light illuminates.

      U0129

      (Meter circuit plate)

      Turn Signal Light


      • Illuminates or turns off the turn signal lights.

      		 Meter circuit plate

      • Brake booster with master cylinder assembly

      • Main body ECU (multiplex network body ECU)

      		 - -

      U0129

      (Meter circuit plate)

      ICS OFF


      • Illuminates or turns off the ICS OFF indicator light.

      		 Meter circuit plate Clearance warning ECU assembly - ICS OFF indicator light flashes. -

      Brake Override System


      • Illuminates or turns off the BOS indicator light.

      • Displays or does not display BOS information.

      		 Meter circuit plate Hybrid vehicle control ECU - Displays messages on the multi-information display. -

      EV Drive Mode Indicator


      • Illuminates or turns off the EV drive mode indicator.

      		 Meter circuit plate

      • ECM

      • Brake booster with master cylinder assembly

      • Hybrid vehicle control ECU

      		 - -

      U0100

      U0129

      (Meter circuit plate)

      SBW Malfunction Indicator


      • Indicates that the SBW is malfunctioning.

      		 Meter circuit plate

      • Main body ECU (multiplex network body ECU)

      • Hybrid vehicle control ECU

      		 - Displays messages on the multi-information display.

      U0293

      (Meter circuit plate)

      Drive Monitor


      • Displays or does not display the drive monitor.

      		 Meter circuit plate

      • ECM

      • Brake booster with master cylinder assembly

      • Main body ECU (multiplex network body ECU)

      • Hybrid vehicle control ECU

      		 -

      • Drive monitor calculation is stopped.

      • The drive monitor is displayed as blank.

      U0129

      (Meter circuit plate)

      Destination


      • Determines the destination information of the vehicle.

      		 Meter circuit plate Main body ECU (multiplex network body ECU) - -

      U0142

      (Meter circuit plate)

      Tire Pressure Monitor System (Tire Pressure Warning Indicator Light)


      • Illuminates or turns off the tire pressure warning indicator light.

      		 Meter circuit plate Main body ECU (multiplex network body ECU) - Tire pressure warning light illuminates.

      U0142

      (Meter circuit plate)

      Linking-up with Multi-information Display


      • Displays information from the navigation system, audio system, telephone system, etc. on the multi-information display.

      		 Meter circuit plate

      • Navigation receiver assembly

      • Radio and display receiver assembly

      		 Information for the navigation system, audio system, etc. is not displayed. -

      U0163

      (Meter circuit plate)

      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). -

      U0293

      (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 While the power switch on (IG), previous values are maintained (during a reset, there is no load control). -

      U0131

      (Air conditioning amplifier assembly)

      Air Conditioning Control


      • Changes the settings of the air conditioning system on the combination meter assembly based on the operation of the steering pad switches.

      		 Air conditioning amplifier assembly Meter circuit plate While the power switch on (IG), previous values are maintained. -

      U0155

      (Air conditioning amplifier assembly)

      Panel Dimming Control


      • Outputs dimming information to the A/C panel according to the display dimming information.

      		 Air conditioning amplifier assembly Main body ECU (multiplex network body ECU) While the power switch on (IG), previous values are maintained (during a reset, dimming control is performed). -

      U0142

      (Air conditioning amplifier assembly)

      Destination Determination Control


      • Switches the A/C control pattern according to the destination information.

      		 Air conditioning amplifier assembly Main body ECU (multiplex network body ECU) While the power switch on (IG), previous values are maintained. -

      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 Meter circuit plate Control is performed based on default vehicle speed of 0 km/h (0 mph). -

      U0155

      (Air conditioning amplifier assembly)

      Air Conditioning Eco Mode Control


      • Eco-mode control is performed.

      		 Air conditioning amplifier assembly Hybrid vehicle control ECU While the power switch on (IG), previous values are maintained (after a reset, the system stays in its normal state of operation). - -

      Solar Calibration Control


      • Calibrates air conditioning control using the value from the solar sensor.

      		 Air conditioning amplifier assembly Main body ECU (multiplex network body ECU) While the power switch on (IG), previous values are maintained. -

      U0142

      (Air conditioning amplifier assembly)

      Power Switch (Power Source Control)


      • Changes the power source mode using the power switch signal as a trigger and requests the hybrid system to start when conditions are met.

      		 Certification ECU (smart key ECU assembly)

      • Hybrid vehicle control ECU

      • Brake booster with master cylinder assembly

      • Main body ECU (multiplex network body ECU)

      • Air conditioning amplifier assembly

      • Electric vehicle charger assembly

      • Solar energy control unit

      		 - Displays messages on the multi-information display.

      U0103

      U0129

      U0140

      U0164

      U0293

      U1135

      U113A

      (Certification ECU (smart key ECU assembly))

      Blind Spot Monitor Control


      • Detects vehicle in blind spot of adjacent lane and informs driver.

      		 Blind spot monitor sensor LH

      • Steering sensor

      • Brake booster with master cylinder assembly

      • Main body ECU (multiplex network body ECU)

      • Hybrid vehicle control ECU

      		 - Displays messages on the multi-information display.

      U0126

      U0129

      U0142

      U0293

      (Blind spot monitor sensor LH)

      Grille Shutter Opening or Closing Operation Control


      • Opens or closes the grille shutter.

      		 Swing grille actuator assembly

      • ECM

      • Hybrid vehicle control ECU

      		 Grille shutter opening operation is performed and further grille shutter operation is prohibited. - -

      LKA/LDA/SWS System

      (Recognizes the lane markers of the lane the vehicle is in using the forward recognition camera and performs the following operations based on the vehicle condition and information captured by the forward recognition camera.)


      • If the system judges that the vehicle may deviate from the lane it is in, the system performs steering assist to help the driver correct the path of the vehicle.

      • If the system judges that the vehicle deviated from the lane it is in, the system sounds a buzzer to inform the driver of lane departure.

      • If the system judges unsteady driving, the system informs the driver to stop and take a rest.

      		 Forward recognition camera

      • Hybrid vehicle control ECU

      • Airbag sensor assembly

      • Steering sensor

      • Brake booster with master cylinder assembly

      • Power steering ECU assembly

      • Main body ECU (multiplex network body ECU)

      • Meter circuit plate

      • Millimeter wave radar sensor assembly

      • Driving support ECU assembly

      • Control stops.

      • EPS torque request suspended.

      • Displays thin lane markers on the multi-information display.

      • Displays messages on the multi-information display.

      U0101

      U0123

      U0126

      U0129

      U0131

      U0142

      U0155

      U0235

      U0293

      U023A

      U1104

      (Forward recognition camera)

      Automatic high beam does not operate.


      • Controls the high beam automatically when the forward recognition camera detects a preceding vehicle or an oncoming vehicle.

      		 Forward recognition camera

      • Airbag sensor assembly

      • Steering sensor

      • Brake booster with master cylinder assembly

      • Millimeter wave radar sensor assembly

      • Hybrid vehicle control ECU

      		 Performs control based on the signals received before the malfunction occurred. Displays messages on the multi-information display.

      U0123

      U0126

      U0129

      U0235

      U0293

      (Forward recognition camera)

      Road Sign Assist Function


      • Identifies road signs while driving and displays them on the multi-information display.

      		 Forward recognition camera

      • Hybrid vehicle control ECU

      • Airbag sensor assembly

      • Brake booster with master cylinder assembly

      • Main body ECU (multiplex network body ECU)

      • Meter circuit plate

      		 Road sign assist function is canceled.

      • Master warning light illuminates.

      • Displays messages on the multi-information display.

      U0101

      U0123

      U0129

      U0142

      U0155

      U0293

      (Forward recognition camera)

      PCS


      • Detects vehicles and pedestrians and applies the brakes automatically if necessary.

      		 Forward recognition camera

      • Airbag sensor assembly

      • Brake booster with master cylinder assembly

      • Main body ECU (multiplex network body ECU)

      • Millimeter wave radar sensor assembly

      • Hybrid vehicle control ECU

      • Driving support ECU assembly

      		 Detection processing is reset and signals indicating that the forward recognition camera is not detecting objects are sent to the driving support ECU assembly.

      • PCS indicator light flashes.

      • Displays messages on the multi-information display.

      U0123

      U0129

      U0142

      U0235

      U0293

      U1104

      (Forward recognition camera)

      Cruise Control


      • Calculates the drive force required to maintain the vehicle speed.

      		 Hybrid vehicle control ECU Brake booster with master cylinder assembly Control stops. Displays messages on the multi-information display.

      U012287

      (Hybrid vehicle control ECU)

      ACC


      • Accelerates or decelerates the vehicle to maintain the distance to the vehicle ahead.

      		 Hybrid vehicle control ECU

      • Brake booster with master cylinder assembly

      • Driving support ECU assembly

      		 Control stops. Displays messages on the multi-information display.

      U010487

      U012287

      U029387

      (Hybrid vehicle control ECU)

      ACC


      • Accelerates or decelerates the vehicle to maintain the distance to the vehicle ahead.

      		 Driving support ECU assembly

      • Airbag sensor assembly

      • Steering sensor

      • Brake booster with master cylinder assembly

      • Millimeter wave radar sensor assembly

      • Hybrid vehicle control ECU

      • Driving support ECU assembly

      		 Control stops.

      • Displays messages on the multi-information display.

      • Buzzer sounds.

      U0125

      U0126

      U0129

      U0235

      U0293

      U1104

      (Driving support ECU assembly)

      PCS


      • Performs pre-crash alarm control, pre-crash brake assist control and pre-crash brake control when an obstruction is detected.

      		 Driving support ECU assembly

      • Airbag sensor assembly

      • Steering sensor

      • Brake booster with master cylinder assembly

      • Millimeter wave radar sensor assembly

      • Forward recognition camera

      • Hybrid vehicle control ECU

      • Driving support ECU assembly

      		 Control stops.

      • PCS indicator light flashes.

      • Displays messages on the multi-information display.

      U0125

      U0126

      U0129

      U0235

      U023A

      U0293

      U1104

      (Driving support ECU assembly)

      Entry Function


      • Entry lock/unlock and back door unlatch

      • Warning

      • Performs entry illumination (Interior illumination, etc.).

      • Displays messages to inform the driver that it is possible to start the hybrid control system.

      • Main body ECU (multiplex network body ECU)

      • Certification ECU (smart key ECU assembly)

      • ECM

      • Main body ECU (multiplex network body ECU)

      • Meter circuit plate

      • Entry lock/ unlock or back door unlatch 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))

      Wireless Function


      • Operates the wireless lock/unlock functions, etc.

      		 Certification ECU (smart key ECU assembly) Main body ECU (multiplex network body ECU) Wireless lock/unlock function do not operate. -

      U0142

      (Certification ECU (smart key ECU assembly))

      Power Switch Backlighting Control


      • Turns on/off power switch illumination linked with interior lights etc.

      		 Certification ECU (smart key ECU assembly) Main body ECU (multiplex network body ECU)

      • When the power switch backlight is not illuminated:

        Does not illuminate.

      • When the power switch backlight is illuminated as the DOME light illuminates:

        Does not turn off.

      		 -

      U0142

      (Certification ECU (smart key ECU assembly))

      Security Indicator Display Function


      • Displays the immobiliser security condition.

      		 Certification ECU (smart key ECU assembly)

      • Main body ECU (multiplex network body ECU)

      • Hybrid vehicle control ECU

      • Security condition cannot display normally (illuminates during security warning preparation/security warning).

      • Entry and start warning cannot display normally.


        • When the hybrid control system is activated, the message to show how to activate the hybrid control system does not turn off immediately.

        • When the hybrid control system is activated, the low key battery warning is not displayed.

      		 -

      U0142

      U0293

      (Certification ECU (smart key ECU assembly))
      Occupant Detection Occupant detection ECU

      • Brake booster with master cylinder assembly

      • Airbag sensor assembly

      		 Sends signals indicating a malfunction to the airbag sensor assembly. SRS warning light illuminates.

      U0125

      U0129

      (Occupant detection ECU)

      Parking Assist Monitor Function


      • 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

      • Hybrid vehicle control ECU

      • Steering sensor

      • Brake booster with master cylinder assembly

      • Main body ECU (multiplex network body ECU)

      • Navigation receiver assembly

      • Radio and display receiver assembly

      • Clearance warning ECU assembly

      • Power steering ECU assembly

      		 Parking assist monitor function is prohibited.

      • Predicted path guide lines are not displayed.

      • All guide lines and the clearance sonar icon are not displayed.

      U0100

      U0126

      U0129

      U0131

      U0140

      U0163

      U1110

      (Rear television camera assembly)

      Air Conditioning Control


      • Controls each function of the air conditioning system, such as the air temperature, to control the temperature and air inlets according to the operation of the touch screen on the navigation display.

      • Navigation receiver assembly

      • Radio and display 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.

      • Changes to the settings of the air conditioning system are prohibited.

      		 Air conditioning connection confirmation screen is displayed.

      • U0073

        U0164

        (Navigation receiver assembly)

      • U0073

        U0164

        (Radio and display receiver assembly)

      Toyota Parking Assist-sensor System Setting/Notification


      • Controls the settings for the clearance sonar screen notifications which are set by touch switch operation, displays the sonar status and plays voice warnings.

      • Navigation receiver assembly

      • Radio and display receiver assembly

      • Hybrid vehicle control ECU

      • Clearance warning ECU assembly

      • If a communication stop occurs while the clearance sonar settings screen is displayed, the settings screen is cleared.

      • If a communication stop occurs while the clearance sonar sensor screen is displayed, the sensor screen is cleared.

      • Clearance sonar icon is not displayed.

      • Screen does not change to the camera screen.

      • U0073

        U0100

        U1110

        (Navigation receiver assembly)

      • U0073

        U0100

        U1110

        (Radio and display receiver assembly)

      Fuel Consumption Display


      • Displays graph of fuel consumption per minute and history of total fuel consumption.

      • Navigation receiver assembly

      • Radio and display receiver assembly

      • ECM

      • Brake booster with master cylinder assembly

      • Meter circuit plate

      • Hybrid vehicle control ECU

      When communication with ECM, brake booster with master cylinder assembly or hybrid vehicle control ECU is interrupted:


      • Display is not updated.

      When communication with meter circuit plate is interrupted:


      • Depending on the interrupted signal, the instantaneous fuel economy, average speed, elapsed time (after start) or drivable mileage is not displayed.

      • Numeric part of driveable mileage is cleared.

      		 -

      • U0100

        U0129

        U0155

        U0293

        (Navigation receiver assembly)

      • U0100

        U0129

        U0155

        U0293

        (Radio and display receiver assembly)

      HV Energy Flow Display


      • Creates energy flow screen which indicates regeneration status and drive force transmission status.

      • Navigation receiver assembly

      • Radio and display receiver assembly

      		 Hybrid vehicle control ECU If communication stops while the energy flow screen is displayed, the energy flow display disappears and the latest value is maintained for the SOC (state of charge) level display. -

      • U0293

        (Navigation receiver assembly)

      • U0293

        (Radio and display receiver assembly)

      Destination Identification


      • Identifies destination based on destination and destination package information, and selects the time zone and language used for the display.

      • Navigation receiver assembly

      • Radio and display receiver assembly

      		 Main body ECU (multiplex network body ECU) Determines the destination according to the last received value and operates accordingly (if there is no last received value, the system operates using the default value). Time zone and language selection screen are different from actual destination.

      • U0140

        (Navigation receiver assembly)

      • U0140

        (Radio and display receiver assembly)

      Rear View Monitor System


      • Displays images from the rear view camera.

      • Navigation receiver assembly

      • Radio and display receiver assembly

      		 Hybrid vehicle control ECU Screen does not change to the camera screen. -

      • U0100

        (Navigation receiver assembly)

      • U0100

        (Radio and display receiver assembly)

      Simple Intelligent Parking Assist System


      • Assists parallel parking operations by operating the steering wheel automatically and, when it is judged that the vehicle needs to change direction while maneuvering, instructs the driver to stop the vehicle and then drive the vehicle forward or backward.

      		 Clearance warning ECU assembly

      • Hybrid vehicle control ECU

      • Airbag sensor assembly

      • Steering sensor

      • Brake booster with master cylinder assembly

      • Power steering ECU assembly

      • Main body ECU (multiplex network body ECU)

      • Meter circuit plate

      • Air conditioning amplifier assembly

      		 Simple intelligent parking assist control is stopped.

      • Displays messages on the multi-information display.

      • Buzzer sounds.

      U0073

      U0100

      U0124

      U0126

      U0129

      U0131

      U0155

      U0164

      U0293

      U1000

      (Clearance warning ECU assembly)

      Intelligent Clearance Sonar System


      • Controls the driving torque and brake operation just before a collision.

      		 Clearance warning ECU assembly

      • Hybrid vehicle control ECU

      • Airbag sensor assembly

      • Steering sensor

      • Brake booster with master cylinder assembly

      		 Intelligent clearance sonar control is stopped.

      • Displays messages on the multi-information display.

      • Buzzer sounds.

      U0073

      U0100

      U0124

      U0126

      U0129

      U0293

      U1000

      (Clearance warning ECU assembly)

      TOYOTA Parking Assist-sensor System


      • Provides notification when an obstacle is detected.

      		 Clearance warning ECU assembly

      • ECM

      • Steering sensor

      • Brake booster with master cylinder assembly

      • Hybrid vehicle control ECU

      		 TOYOTA parking assist-sensor control is stopped. -

      U0100

      U0126

      U0129

      U0293

      (Clearance warning ECU assembly)

      Power Steering Control


      • Calculates assist current according to torque sensor value and vehicle speed and drives motor.

      		 Power steering ECU assembly

      • Hybrid vehicle control ECU

      • Brake booster with master cylinder assembly

      • Airbag sensor assembly

      • Steering sensor

      • Control is performed temporarily with the steering assist amount set to that used when the vehicle speed is 100 km/h (62 mph).

      • Zero point learning is not performed.

      • Drivability degrades (compensation control using steering angle is stopped).

      		 EPS warning light illuminates.

      U0129

      U0293

      (Power steering ECU assembly)

      Assist Map Selection


      • Selects proper assist map according to destination, engine type, etc.

      		 Power steering ECU assembly

      • Brake booster with master cylinder assembly

      • Main body ECU (multiplex network body ECU)

      		 Default map is used to assist because proper assist map cannot be selected. (Steering feel may be different.) EPS warning light illuminates.

      C1581

      (Power steering ECU assembly)

      VDIMα System


      • Calculates current to be used for steering assist according to commanded value from VSC, and then operates motor.

      		 Power steering ECU assembly Brake booster with master cylinder assembly VDIMα control is stopped. -

      U0129

      (Power steering ECU assembly)

      LKA System


      • Calculates the required current for steering assist control based on the torque request signals from the forward recognition camera and operates the motor.

      		 Power steering ECU assembly

      • Steering sensor

      • Brake booster with master cylinder assembly

      • Forward recognition camera

      		 Control stops. -

      U023A

      (Power steering ECU assembly)

      IPA System


      • Calculates the required current for steering assist control based on the torque request signals from the clearance warning ECU assembly and operates the motor.

      • Power steering ECU assembly

      • Clearance warning ECU assembly

      • Steering sensor

      • Brake booster with master cylinder assembly

      • Clearance warning ECU assembly

      		 Control stops. -

      U0129

      U1110

      (Power steering ECU assembly)

      Headup Display


      • Displays information related to the pre-crash safety system.

      		 Combination meter mirror ECU Driving support ECU assembly Control is performed the same as when there is no display request signals. -

      U1104

      (Combination meter mirror ECU)

      Headup Display


      • Displays lane markers.

      		 Combination meter mirror ECU Forward recognition camera Lane markers are not displayed. -

      U023A

      (Combination meter mirror ECU)

      GRS ECU


      • Cooperative control between the swing grille actuator assembly and ECM.

      		 ECM Swing grille actuator assembly The grille shutter is kept fully open. MIL illuminates.*1

      U028487

      (ECM)

      MG ECU


      • Cooperative control between the inverter with converter assembly and ECM.

      		 ECM Inverter with converter assembly Engine is stopped. MIL illuminates.

      U011087

      (ECM)

      HV ECU


      • Cooperative control between the hybrid vehicle control ECU and ECM.

      		 ECM

      • Hybrid vehicle control ECU

      • Battery ECU assembly

      		 Engine is stopped. MIL illuminates.*2

      U029387

      U117587

      U129387

      (ECM)

      Headlight Leveling Control (Headlight Control)


      • Adjusts headlights vertical aiming according to wheel speed and vehicle pitch angle determined using vehicle height sensor.

      		 No. 1 headlight ECU sub-assembly LH

      • Brake booster with master cylinder assembly

      • Main body ECU (multiplex network body ECU)

      • Hybrid vehicle control ECU

      • ECM

      		 Control stops. -

      U0100

      U0129

      U0142

      U0293

      (No. 1 headlight ECU sub-assembly LH)

      Destination Identification


      • Checks if the destination information stored in the No. 1 headlight ECU sub-assembly LH and the destination information data transmitted in the CAN bus lines are the same.

      		 No. 1 headlight ECU sub-assembly LH

      • ECM

      • Main body ECU (multiplex network body ECU)

      		 - -

      U0100

      U0142

      (No. 1 headlight ECU sub-assembly LH)

      Low Beam Headlights, High Beam Headlights, Clearance Lights and Side Marker Lights


      • Turns the specified light source on and off according to low beam, high beam command data.

      		 No. 1 headlight ECU sub-assembly LH Main body ECU (multiplex network body ECU) The low beam headlights, clearance lights and side marker lights are forcibly illuminated. -

      U0142

      (No. 1 headlight ECU sub-assembly LH)

      Adaptive High Beam System


      • Controls high beams based on the wheel speed, steering angle, shift state and data from the camera.

      		 No. 1 headlight ECU sub-assembly LH

      • Main body ECU (multiplex network body ECU)

      • Brake booster with master cylinder assembly

      • Hybrid vehicle control ECU

      • Steering sensor

      • Commands the headlights to operate in low beam.

      • Other controls (the cut-off line tilt control, headlight swivel control, etc.) are suspended.

      		 -

      U0101

      U0126

      U0129

      U0142

      (No. 1 headlight ECU sub-assembly LH)

      Door Lock


      • Controls key linked and automatic door lock/unlock function, key confinement prevention function, etc.

      		 Main body ECU (multiplex network body ECU) Airbag sensor assembly Key linked door lock/unlock function is performed even when the power switch is on (IG) and the driver seatbelt is fastened. -

      U0151

      (Main body ECU (multiplex network body ECU))

      Shift-linked Automatic Door Lock Function


      • Automatically locks all of the doors when the shift lever is moved to select another shift state with park (P) selected.

      		 Main body ECU (multiplex network body ECU) Hybrid vehicle control ECU

      All of the doors are not locked automatically when all of the following conditions are met.


      • The power switch is on (IG), the hybrid control system is started and all of the doors are closed.

      • With park (P) selected, the shift lever is moved to select another shift state.

      		 -

      U0101

      (Main body ECU (multiplex network body ECU))

      Shift-linked Automatic Door Unlock Function


      • Automatically unlocks all of the doors when the P position switch (transmission shift main switch) is pushed with a shift state other than park (P) selected.

      		 Main body ECU (multiplex network body ECU)

      • Hybrid vehicle control ECU

      • Meter circuit plate

      All of the doors are not locked automatically when all of the following conditions are met.


      • The power switch is on (IG), the hybrid control system is started and all of the doors are closed.

      • With park (P) selected, the shift lever is moved to select another shift state.

      		 -

      U0101

      U0155

      (Main body ECU (multiplex network body ECU))

      Speed-sensitive Automatic Door Lock Function


      • Automatically locks all of the doors when the vehicle is determined that the vehicle is being driven.

      		 Main body ECU (multiplex network body ECU) Meter circuit plate

      All of the doors are not locked automatically when all of the following conditions are met.


      • The power switch is on (IG) and the hybrid control system is started.

      • Vehicle speed is higher than approximately 20 km/h (12 mph).

      		 -

      U0155

      (Main body ECU (multiplex network body ECU))

      Manual Unlock Prohibition Function


      • When it is determined that the vehicle is parked and the doors are locked or closed after driver left vehicle, unlocking the vehicle using the door control switch is prohibited.

      		 Main body ECU (multiplex network body ECU)

      • ECM

      • Hybrid vehicle control ECU

      • The manual unlock prohibition cannot be canceled when the hybrid control system has been started.

      • The manual unlock prohibition cannot be canceled when the vehicle is in the ready state.

      		 -

      U0100

      (Main body ECU (multiplex network body ECU))

      Power Door Lock Control System Customize Setting


      • Enables or disables each power door lock or unlock function in accordance with user operation.

      		 Main body ECU (multiplex network body ECU) Hybrid vehicle control ECU

      • Shift linked automatic lock control does not occur.

      • Automatic lock/unlock cannot be changed.

      		 -

      U0101

      (Main body ECU (multiplex network body ECU))

      Wireless Function


      • Locks and unlocks doors, etc. via remote operation.

      		 Main body ECU (multiplex network body ECU) Certification ECU (smart key ECU assembly) The doors cannot be locked or unlocked via remote operation. - -

      Entry Lock/Unlock


      • Locks or unlocks doors using the entry lock/unlock operation.

      		 Main body ECU (multiplex network body ECU) Certification ECU (smart key ECU assembly) The doors cannot be locked or unlocked via remote operation. - -

      Wireless Door Lock Buzzer


      • Sounds when the doors are locked/unlocked by wireless operation.

      		 Main body ECU (multiplex network body ECU) Certification ECU (smart key ECU assembly) The wireless door lock buzzer does not sound when the doors are locked/unlocked by wireless operation. -

      U0327

      (Main body ECU (multiplex network body ECU))

      Back Door Open Function


      • When the back door open switch is pushed and held with the back door locked, the back door unlocks and then unlatches.

      		 Main body ECU (multiplex network body ECU) Certification ECU (smart key ECU assembly) When the back door open switch is pushed and held with the back door locked, the back door does not unlock or unlatch. -

      U0327

      (Main body ECU (multiplex network body ECU))

      Dome Lights


      • Illuminates when approaching any of the doors while holding an entry key.

      		 Main body ECU (multiplex network body ECU) Certification ECU (smart key ECU assembly) The interior lights remain off when the electrical key transmitter sub-assembly is close to any of the doors. -

      U0327

      (Main body ECU (multiplex network body ECU))

      Dimmer Controlled Illumination


      • Dims the illumination of the instrument panel ambient illumination lights or ambient illumination lights when the vehicle starts driving.

      		 Main body ECU (multiplex network body ECU) Hybrid vehicle control ECU The interior lights remain on without being dimmed when the shift state is park (P) and a shift state other than park (P) is selected. -

      U0101

      (Main body ECU (multiplex network body ECU))

      Alarm Function


      • In the armed state, the alarm function judges break-in according to changes in door courtesy status and the alarm sounds.

      		 Main body ECU (multiplex network body ECU)

      • ECM

      • Certification ECU (smart key ECU assembly)

      • Hybrid vehicle control ECU

      • After the vehicle is locked using wireless operation, pressing the push start switch before the alarm is set does not unset the alarm and, after a specified period of time, the alarm will be set.

      • While in the alarm sounding state, the alarm is not canceled when a registered smart key is certified and the push start switch is pressed.

      • While in the alarm sounding state, the alarm is not canceled when the hybrid control system has been started.

      • While in the alarm sounding state, the alarm is not canceled when the power switch is turned on (READY).

      		 -

      U0100

      U0120

      U0293

      (Main body ECU (multiplex network body ECU))

      Auxiliary Battery Saving Function


      • When it is determined that the vehicle is parked, stops sending illumination request signals and cuts power to the interior lights to avoid a depleted battery.

      		 Main body ECU (multiplex network body ECU) Certification ECU (smart key ECU assembly) When the auxiliary battery is in battery saving mode and any of the doors are approached while holding an entry key, the auxiliary battery saving function is not canceled and the interior illuminations do not illuminate. -

      U0327

      (Main body ECU (multiplex network body ECU))

      Interior Light Auto Cut Function


      • Turns off the interior lights automatically when the driver leaves the vehicle with the interior lights illuminated.

      		 Main body ECU (multiplex network body ECU) Certification ECU (smart key ECU assembly) The headlights do not turn off when the lock switch of the electrical key transmitter sub assembly is pressed with all of the doors locked during the interior light auto cut function is performed. - -

      Headlight System Malfunction Warning Display


      • Detects an open circuit or a malfunctioning ECU in the LED headlight system and informs the driver of the malfunction.

      		 Main body ECU (multiplex network body ECU)

      • ECM

      • Meter circuit plate

      • Hybrid vehicle control ECU

      • When an LED headlight malfunction is detected, the LED headlight warning display is not displayed when the low beam headlights are turned on when the hybrid control system has been started.

      • When an LED headlight malfunction is detected, the LED headlight warning display is not displayed when the low beam headlights are turned on when the power switch is turned on (READY).

      		 -

      U0100

      U0293

      (Main body ECU (multiplex network body ECU))

      Meter Illumination Auto Dimmer


      • Determines whether it is daytime or nighttime based on the automatic light control sensor signals and, when it is determined that it is nighttime or dark, dims the meter illumination according to interior light illuminations and tail cancel switch state.

      		 Main body ECU (multiplex network body ECU) Meter circuit plate The meter illumination is dimmed when the tail cancel switch is on. -

      U0155

      (Main body ECU (multiplex network body ECU))

      • *1: w/ Occupant Classification System

      • *2: w/o Occupant Classification System (Even if DTC U129387 is stored, the MIL will not illuminate.)