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)

      Vehicle Stability Control


      • Prevents the vehicle from skidding when the steering wheel is turned abruptly by the driver when on highways, snowy roads, etc.

      		 Brake actuator assembly

      • ECM

      • Steering sensor

      • Airbag sensor assembly

      		 Control stops.

      • Brake warning light / red (malfunction) illuminates.

      • ABS warning light illuminates.

      • Slip indicator light illuminates.

      U0073

      U0100

      U0123

      U0126

      (Brake actuator assembly)

      Traction Control


      • Controls torque to ensure vehicle stability and traction. This control uses the engine speed and accelerator pedal position.

      		 Brake actuator assembly

      • ECM

      • Steering sensor

      • Airbag sensor assembly

      		 Control stops.

      • Brake warning light / red (malfunction) illuminates.

      • ABS warning light illuminates.

      U0073

      (Brake actuator assembly)
      Slip indicator light illuminates.

      U0100

      U0123

      U0126

      (Brake actuator assembly)

      Anti-lock Brake System Control


      • Avoids wheel lockup to assist vehicle stability when the brake pedal is fully depressed.

      		 Brake actuator assembly - Only electric brake force distribution control is available.

      • Brake warning light / red (malfunction) illuminates.

      • ABS warning light illuminates.

      • Slip indicator light illuminates.

      U0073

      (Brake actuator assembly)

      Hill-start Assist Control


      • Maintains brake torque in order to prevent the vehicle from rolling backwards when stopped on an uphill road.

      		 Brake actuator assembly

      • ECM

      • Steering sensor

      • Airbag sensor assembly

      		 Control stops.

      • Brake warning light / red (malfunction) illuminates.

      • ABS warning light illuminates.

      U0073

      (Brake actuator assembly)
      Slip indicator light illuminates.

      U0100

      U0123

      U0126

      (Brake actuator assembly)

      Pre-collision System


      • Applies the brakes based on information from the radar/camera system in order to avoid a collision.

      		 Brake actuator assembly

      • Millimeter wave radar sensor assembly

      • ECM

      • Steering sensor

      • Airbag sensor assembly

      		 Control stops.

      • Brake warning light / red (malfunction) illuminates.

      • ABS warning light illuminates.

      U0073

      (Brake actuator assembly)
      Slip indicator light illuminates.

      U0100

      U0123

      U0126

      (Brake actuator assembly)

      Dynamic Radar Cruise Control System


      • Applies the brakes to maintain an appropriate distance with the preceding vehicle.

      		 Brake actuator assembly

      • ECM

      • Steering sensor

      • Airbag sensor assembly

      		 Control stops.

      • Brake warning light / red (malfunction) illuminates.

      • ABS warning light illuminates.

      U0073

      (Brake actuator assembly)
      Slip indicator light illuminates.

      U0100

      U0123

      U0126

      (Brake actuator assembly)

      Secondary Collision Control System


      • Applies the brakes to decelerate the vehicle after detecting a collision and to prevent or reduce the impact of a secondary collision.

      		 Brake actuator assembly

      • ECM

      • Airbag sensor assembly

      		 Secondary collision control system is disabled. Displays messages on the multi-information display.

      U0073

      U0100

      U0151

      (Brake actuator assembly)

      Brake Hold Function


      • Maintains the brake fluid pressure in order to keep the vehicle stationary when the brake pedal is released when the vehicle is stationary.

      		 Brake actuator assembly

      • ECM

      • Steering sensor

      • Airbag sensor assembly

      • Main body ECU (multiplex network body ECU)

      		 Control stops. Brake hold operated indicator light blinks.

      U0073

      U0100

      U0123

      U0126

      U0142

      (Brake actuator assembly)

      Electric Parking Brake System


      • Automatically disengages the electric parking brake system when the accelerator pedal is depressed.

      		 Brake actuator assembly

      • ECM

      • Airbag sensor assembly

      • Main body ECU (multiplex network body ECU)

      		 Control stops. Parking brake indicator light illuminates.

      U0073

      U0100

      U0142

      (Brake actuator 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)
      Occupant Detection Occupant detection ECU

      • Brake actuator assembly

      • Airbag sensor assembly

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

      U0125

      U0129

      (Occupant detection ECU)
      Vehicle Speed Display Combination meter assembly Brake actuator assembly Speedometer is controlled based on a default vehicle speed of 0 km/h (0 mph).

      • Brake warning light / red (malfunction) illuminates.

      • ABS warning light illuminates.

      • VSC OFF indicator light illuminates.

      U012987

      (Combination meter assembly)
      Tachometer Display Combination meter assembly ECM Needle of tachometer remains at 0 rpm. MIL illuminates.

      U010087

      (Combination meter assembly)

      Meter Display


      • Displays vehicle condition and controls indicator lights.

      		 Combination meter assembly

      • Rack and pinion power steering gear assembly

      • Main body ECU (multiplex network body ECU)

      • Airbag sensor assembly

      • Forward recognition camera

      • Radio and display receiver assembly

      • Blind spot monitor sensor RH

      • Air conditioning amplifier assembly

      • Certification ECU (smart key ECU assembly)

      • Option connector (bus buffer ECU)

      • Steering sensor

      • Millimeter wave radar sensor assembly

      • Clearance warning ECU assembly

      • Brake actuator assembly

      • Headlight ECU sub-assembly LH

      		 Vehicle information is not displayed. Abnormal light operation

      U013187

      U014287

      U015187

      U016387

      U016487

      U018287

      U023387

      U023587

      U023A87

      U032787

      U110687

      U111087

      U111287

      U111787

      U113387

      (Combination meter assembly)

      Speedometer


      • Displays the current vehicle speed.

      		 Meter mirror sub-assembly Combination meter assembly

      • Vehicle speed value: 0 is displayed.

      • Vehicle speed unit: Is not displayed.

      		 -

      U015587

      (Meter mirror sub-assembly)

      Display Brightness Adjustment


      • Adjusts the brightness of the display.

      		 Meter mirror sub-assembly Combination meter assembly The last valid state is maintained. -

      U015587

      (Meter mirror sub-assembly)

      Display Position Adjustment


      • Adjusts the position of the display.

      		 Meter mirror sub-assembly Combination meter assembly The last valid state is maintained. -

      U015587

      (Meter mirror sub-assembly)

      Display Rotation Adjustment


      • Adjusts the rotation of the display.

      		 Meter mirror sub-assembly Combination meter assembly Displays the display using the default rotation. -

      U015587

      (Meter mirror sub-assembly)

      Tachometer


      • Displays the engine speed.

      		 Meter mirror sub-assembly ECM The tachometer in the headup display displays an engine speed of 0 rpm. -

      U010087

      (Meter mirror sub-assembly)

      Eco Driving Indicator


      • Displays the Eco driving indicator.

      		 Meter mirror sub-assembly ECM Stops displaying the ECO display. (ECO OFF) -

      U010087

      (Meter mirror sub-assembly)

      Shift Position Display


      • Displays the shift position.

      		 Meter mirror sub-assembly ECM Not displayed. -

      U010087

      (Meter mirror sub-assembly)

      Pre-collision System


      • Displays warning notifications.

      		 Meter mirror sub-assembly Millimeter wave radar sensor assembly Not displayed. -

      U023587

      (Meter mirror sub-assembly)

      Dynamic Radar Cruise Control System


      • Displays an icon representing the preceding vehicle, set vehicle-to-vehicle distance and set speed.

      		 Meter mirror sub-assembly ECM Not displayed. -

      U010087

      (Meter mirror sub-assembly)

      Lane Departure Alert System


      • Displays the left and right road marking icons, steering icon and rest reminder icon.

      		 Meter mirror sub-assembly Forward recognition camera Not displayed. -

      U023A87

      (Meter mirror sub-assembly)

      TOYOTA Parking Assist-sensor System


      • Displays the detection status of the clearance sonar.

      		 Meter mirror sub-assembly Clearance warning ECU assembly Not displayed. -

      U111087

      (Meter mirror sub-assembly)

      Information


      • Hides information icons and messages.

      		 Meter mirror sub-assembly Combination meter assembly Not displayed. -

      U015587

      (Meter mirror sub-assembly)

      Display Customization


      • Switches the display content between on and off.

      		 Meter mirror sub-assembly Combination meter assembly Not displayed. -

      U015587

      (Meter mirror sub-assembly)

      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 Rack and pinion power steering gear assembly While the ignition switch is ON, previous values are maintained (during a reset, there is no load control). -

      U0131

      (Air conditioning amplifier assembly)

      Panel Control


      • Operation and panel switch indicator display control based on panel switch operation.

      		 Air conditioning amplifier assembly Radio and display receiver assembly Air conditioning system operation state cannot be changed. -

      U0163

      (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 ignition switch is ON, 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 ignition switch is ON, 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 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)

      Entry Function


      • Entry lock/unlock, entry luggage compartment open.

      • Warning

      • Performs entry illumination (Interior illumination etc.).

      • Engine Start Enabled Display

      		 Certification ECU (smart key ECU assembly)

      • Main body ECU (multiplex network body ECU)

      • Combination meter assembly

      • ECM

      • Warning functions (Key confinement, Key not in vehicle, Key reminder etc.) do not operate, Engine start enabled display does not operate, Key confinement prevention control does not operate.

      • Entry lock/unlock or entry luggage compartment open does not operate.

      • Entry illumination does not operate.

      • Wrong entry warning is output.

      		 -

      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 and luggage compartment opener can be operated when the ignition switch is ON. -

      U0142

      (Certification ECU (smart key ECU assembly))

      Engine Switch Backlighting Control


      • Illuminates or turns off the engine switch illumination based on the status of the interior lights, etc.

      		 Certification ECU (smart key ECU assembly)

      • Main body ECU (multiplex network body ECU)

      • Combination meter assembly

      • When the engine switch backlight is not illuminated:

        Does not illuminate.

      • When the engine 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)

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

      • Entry and start warning cannot display normally.


        • When the engine is started, the message to show how to start the engine does not turn off immediately.

        • When the engine is started, the low electrical key transmitter sub-assembly battery warning is not displayed.

      		 -

      U0142

      (Certification ECU (smart key ECU assembly))

      Engine Start/Stop Switch (Power Source Mode Change)


      • Changes the power source mode and outputs a start signal based on the operation of the switch.

      		 Certification ECU (smart key ECU assembly)

      • Main body ECU (multiplex network body ECU)

      • ECM

      • Combination meter assembly

      • Option connector (bus buffer ECU)

      		 -

      • A message urging engine start operation is not displayed when required.

      • Engine switch indicator blinks in amber.

      U0100

      U0140

      U0155

      U1117

      (Certification ECU (smart key ECU assembly))

      Electric Load Control


      • Performs idle up according to electric load.

      		 ECM

      • Air conditioning amplifier assembly

      • Rack and pinion power steering gear assembly

      • Main body ECU (multiplex network body ECU)

      		 Idle up according to electric load is not performed. - -

      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. -

      Eco Driving Indicator


      • Displays information to the driver to encourage Eco-driving.

      		 ECM - No information is displayed. - -

      Integrated Control (VDM)


      • Estimates the driver requested torque based on the accelerator pedal operation and performs torque characteristic control according to driving conditions so that driveability, acceleration performance and acceleration feeling are improved.

      		 ECM

      • Millimeter wave radar sensor assembly

      • Brake actuator assembly

      • Airbag sensor assembly

      • Steering sensor

      		 Does not estimate the driver requested torque based on the accelerator pedal operation and does not perform torque characteristic control according to driving conditions and as a result, driveability, acceleration performance and acceleration feeling are not improved. - -

      Eco Control


      • Adjusts throttle response in consideration of actual fuel economy.

      		 ECM

      • Air conditioning amplifier assembly

      • Combination meter assembly

      		 Eco mode does not operate. - -

      Headlight Leveling Control


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

      		 Headlight ECU sub-assembly LH Brake actuator assembly Control stops. Displays messages on the multi-information display.

      U0129

      (Headlight ECU sub-assembly LH)

      Destination Identification


      • Checks if the destination information stored in the headlight ECU sub-assembly LH and the destination information data transmitted in the CAN bus lines are the same.

      		 Headlight ECU sub-assembly LH Main body ECU (multiplex network body ECU) - -

      U0142

      (Headlight ECU sub-assembly LH)

      Low Beam, High Beam, Daytime Running Light, Clearance Light


      • Illuminate and turn off according to light request signals.

      • Headlight ECU sub-assembly LH

      • Headlight ECU sub-assembly RH

      		 Main body ECU (multiplex network body ECU) When the ignition switch is ON the daytime running lights and high beam headlights are disabled and the low beam headlights and clearance lights turn on. -

      U0142

      (Headlight ECU sub-assembly LH)

      U0142

      (Headlight ECU sub-assembly RH)

      Blind Spot Monitor Control


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

      		 Blind spot monitor sensor RH

      • Brake actuator assembly

      • Steering sensor

      • Main body ECU (multiplex network body ECU)

      • ECM

      • Airbag sensor assembly

      		 - Displays messages on the multi-information display.

      U0100

      U0125

      U0126

      U0129

      U0142

      (Blind spot monitor sensor RH)

      Automatic High Beam System


      • High beam light distribution control.

      		 Forward recognition camera

      • ECM

      • Brake actuator assembly

      • Main body ECU (multiplex network body ECU)

      • Airbag sensor assembly

      • Steering sensor

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

      Lane Departure Alert System


      • Sounds an alarm when deviating from the lane, and performs steering assist toward the center of the lane.

      		 Forward recognition camera

      • ECM

      • Rack and pinion power steering gear assembly

      • Brake actuator assembly

      • Main body ECU (multiplex network body ECU)

      • Combination meter assembly

      • Airbag sensor assembly

      • Millimeter wave radar sensor assembly

      • Steering sensor

      		 Control stops.

      • Displays messages on the multi-information display.

      • Buzzer sounds.

      U0100

      U0123

      U0126

      U0129

      U0131

      U0142

      U0155

      U0235

      (Forward recognition camera)

      Road Sign Assist Function


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

      		 Forward recognition camera

      • Brake actuator assembly

      • Airbag sensor assembly

      		 Road sign assist function is canceled.

      • Displays messages on the multi-information display.

      • Buzzer sounds.

      • Master warning light illuminates.

      U0123

      U0129

      (Forward recognition camera)

      Pre-collision System


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

      		 Millimeter wave radar sensor assembly

      • Brake actuator assembly

      • Airbag sensor assembly

      • Steering sensor

      • ECM

      • Forward recognition camera

      • Combination meter assembly

      		 Control stops.

      • Displays messages on the multi-information display.

      • Buzzer sounds.

      • PCS warning light blinks.

      U0100

      U0125

      U0126

      U0129

      U0155

      U0235

      U023A

      U1002

      (Millimeter wave radar sensor assembly)

      Cruise Control (for 2AR-FE)


      • Adjusts the engine throttle valve opening amount automatically to control the vehicle.

      		 ECM Brake actuator assembly Control stops. Displays messages on the multi-information display.

      U0122

      (ECM)

      Cruise Control (except 2AR-FE)


      • Adjusts the engine throttle valve opening amount automatically to control the vehicle.

      		 ECM Brake actuator assembly Control stops. Displays messages on the multi-information display.

      U012287

      (ECM)

      Dynamic Radar Cruise Control System (for 2AR-FE)


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

      		 ECM

      • Brake actuator assembly

      • Millimeter wave radar sensor assembly

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

      U0100

      U0104

      U0122

      (ECM)

      Dynamic Radar Cruise Control System (except 2AR-FE)


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

      		 ECM

      • Brake actuator assembly

      • Millimeter wave radar sensor assembly

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

      U010087

      U010487

      U012287

      (ECM)

      Dynamic Radar Cruise Control System


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

      		 Millimeter wave radar sensor assembly

      • Brake actuator assembly

      • Airbag sensor assembly

      • Steering sensor

      • ECM

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

      U0100

      U0125

      U0126

      U0129

      (Millimeter wave radar sensor assembly)

      Power Steering Control


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

      		 Rack and pinion power steering gear assembly

      • ECM

      • Brake actuator assembly

      During communication malfunction with ECM:


      • When steering assist is not being performed:

        Steering assist is controlled at a set amount.

      • When steering assist is being performed:

        Steering assist is suspended.

      During communication malfunction with brake actuator assembly:


      • Vehicle speed related assist is not performed.

      		 EPS warning light illuminates.

      U0100

      U0129

      (Rack and pinion power steering gear assembly)

      Assist Map Selection


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

      		 Rack and pinion power steering gear assembly

      • Main body ECU (multiplex network body ECU)

      • Brake actuator assembly

      • ECM

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

      C1581

      (Rack and pinion power steering gear assembly)

      VDIM


      • Drives the motor according to the assist amount calculated by the brake actuator assembly.

      		 Rack and pinion power steering gear assembly Brake actuator assembly VDIM control is prohibited. -

      U0129

      (Rack and pinion power steering gear assembly)

      Auto Location


      • Displays the location and pressure value of all tires on the combination meter assembly.

      		 Tire pressure warning ECU and receiver Brake actuator assembly Auto Location function is prohibited. -

      U0129

      (Tire pressure warning ECU and receiver)

      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 ignition switch is ON 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) ECM

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


      • The ignition switch is ON, the engine is running 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)

      • ECM

      • Combination meter assembly

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


      • The ignition switch is ON, the engine is running 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) Combination meter assembly

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


      • The ignition switch is ON and the engine is running.

      • 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 the driver has left the vehicle, unlocking the vehicle using the door control switch is prohibited.

      		 Main body ECU (multiplex network body ECU) ECM The manual unlock prohibition cannot be canceled when the engine has been started. -

      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) ECM

      • 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)

      • Option connector (bus buffer ECU)

      		 The doors cannot be locked or unlocked via remote operation. -

      U1117

      (Main body ECU (multiplex network body ECU))

      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)

      • Option connector (bus buffer ECU)

      		 The doors cannot be locked or unlocked via remote operation. -

      U0327

      U1117

      (Main body ECU (multiplex network body ECU))

      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))

      Luggage Compartment Door Opener System


      • Unlocks and unlatches the luggage compartment door when the luggage electrical key switch is pushed and held with the luggage compartment door locked.

      		 Main body ECU (multiplex network body ECU) Certification ECU (smart key ECU assembly) When the luggage electrical key switch is pushed and held with the luggage compartment door locked, the luggage compartment door does not unlatch. -

      U0327

      (Main body ECU (multiplex network body ECU))

      Luggage Compartment Door Opener System


      • Unlatches the luggage compartment door when the luggage door opening switch assembly is pushed.

      		 Main body ECU (multiplex network body ECU)

      • Combination meter assembly

      • ECM

      		 When the luggage door opening switch assembly is pushed and held, the luggage compartment door does not unlatch. -

      U0101

      U0155

      (Main body ECU (multiplex network body ECU))

      Seat and Mirror Control


      • Memory switch memorization and recall

      • Memory call memorization and recall

      		 Main body ECU (multiplex network body ECU)

      • Position control ECU assembly RH

      • Multiplex tilt and telescopic ECU

      • Outer mirror control ECU assembly (for driver side)

      • Outer mirror control ECU assembly (for front passenger side)

      • Brake actuator assembly

      • Combination meter assembly

      • Certification ECU (smart key ECU assembly)

      		 Operation of the seat, tilt and telescopic mechanism, etc. is suspended. -

      U0155

      U0199

      U0200

      U0208

      U0327

      U1106

      U1115

      (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) ECM 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)

      • Certification ECU (smart key ECU assembly)

      • Option connector (bus buffer ECU)

      • ECM

      • 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.

      • When the alarm is sounding, the alarm is not canceled when the engine has been started.

      		 -

      U0100

      U0120

      U1117

      (Main body ECU (multiplex network body ECU))

      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 battery is in battery saving mode and any of the doors are approached while holding an entry key, the 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 when the interior light auto cut function is being 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 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 engine has been started. -

      U0100

      (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) Combination meter assembly The meter illumination is dimmed when the tail cancel switch is on. -

      U0155

      (Main body ECU (multiplex network body ECU))

      Key Off Operation


      • Permits the power window to operate for 43 seconds after the ignition switch is turned off.

      		 Main body ECU (multiplex network body ECU) ECM The engine speed is set to 0. -

      U0100

      (Main body ECU (multiplex network body ECU))

      Headlights Left Off Warning


      • Suggests that the driver turns the headlights on when the headlights are not illuminated while driving at night.

      		 Main body ECU (multiplex network body ECU) Combination meter assembly The suggestion that the driver turns the headlights on is not displayed on the multi-information display in the combination meter assembly when the headlight dimmer switch is OFF or TAIL while driving at night. -

      U0155

      (Main body ECU (multiplex network body ECU))

      Automatic High Beam System


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

      		 Main body ECU (multiplex network body ECU)

      • Forward recognition camera

      • Headlight ECU sub-assembly LH

      		 Automatic high beam system does not operate. Automatic high beam indicator light flashes.

      U0182

      U023A

      (Main body ECU (multiplex network body ECU))

      Air Conditioning Control


      • Controls air conditioning functions.

      		 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.

      		 -

      U0073

      U0164

      (Radio and display receiver assembly)

      Fuel Consumption Display


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

      		 Radio and display receiver assembly

      • ECM

      • Brake actuator assembly

      • Combination meter assembly

      • The fuel consumption calculation is not performed.

      • The existing data is cleared and the per-minute fuel consumption calculation resumes after normal data is received again.

      • If the fuel consumption display scale signal (FC_SCL) or drive monitor unit signal (UNIT_6) cannot be received from the combination meter assembly, the display shows the last known value.

      • If the following data cannot be received from the combination meter assembly, nothing is displayed on the fuel consumption display. If there is a communication error, nothing is displayed on the fuel consumption display until communication returns to normal.


        • Current fuel consumption/Average speed (after start)/Elapsed time (after start)/Drivable distance

      • If the following data cannot be received from the combination meter assembly, the previous data is displayed. If there is no previous data, nothing is displayed on the fuel consumption display. If there is a communication error, the last known data is displayed on the fuel consumption display until communication returns to normal.


        • section average fuel consumption (latest graph)

      		 -

      U0073

      U0100

      U0129

      U0155

      (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.

      		 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.

      U0073

      U0140

      (Radio and display receiver assembly)

      Vehicle Customize Function


      • Changes the behavior and control parameters of various functions (illumination lighting time, etc.) according to the user operation via the screen.

      		 Radio and display receiver assembly

      • Main body ECU (multiplex network body ECU)

      • Air conditioning amplifier assembly

      • Certification ECU (smart key ECU assembly)

      • When an application that uses phase 4 remote communication is activated (customization/remote diagnosis), the process will be performed regardless of main body ECU (multiplex network body ECU) remote communication permit/prohibit state.

      • The enter button is grayed out and selection is not possible.

      • Performs customization according to diagnostic communication

      • Retries 3 times

      		 -

      U0073

      (Radio and display receiver assembly)

      Rear View Monitor System


      • Displays images from the rear view camera.

      		 Radio and display receiver assembly ECM Screen does not change to the camera screen. - -

      Back Guide Monitor Function


      • Displays the image from the rear view camera with the predicted path guide lines, vehicle width extension guide lines and distance guide lines overlaid when reversing.

      		 Radio and display receiver assembly

      • ECM

      • Rear television camera assembly

      • When in camera diagnostic mode, transitions to the multi-media screen and the camera diagnosis screen starts.

      • When DTC C1610 is stored, current DTC C1610 is cleared.

      • Sends reactive force setting completion notifications and pointer coordinates as a setting signal for each error when it occurs. Treats the camera screen pattern as a setting signal for each error when it occurs, and performs the reactive force setting when the camera image is displayed.

      • When in camera mode, transitions to the multi-media screen and the camera screen.

      		 -

      U0073

      U0265

      (Radio and display receiver assembly)

      Meter-linked Function


      • Changes display based on customization information set through the meter.

      • Outputs the customization information set in the system.

      		 Radio and display receiver assembly Combination meter assembly

      • Language, unit and accent color linking: Maintains the last valid settings.

      • GS search: Performs control without confirming if there is a GS search request. Uses the last valid settings. Grays out the settings to prevent them from being changed when displayed.

      		 -

      U0073

      U0155

      (Radio and display receiver assembly)

      Information Sound Adjustment Function


      • Receives flags from the millimeter wave radar sensor assembly to operate the alarm, and limits or mutes multimedia audio while the alarm is in operation.

      		 Radio and display receiver assembly Millimeter wave radar sensor assembly Audio mute is canceled. -

      U0073

      (Radio and display receiver assembly)

      TOYOTA Parking Assist-sensor System Setting


      • Controls the settings for the clearance sonar screen notifications.

      		 Radio and display receiver assembly Clearance warning ECU assembly Returns to the previous display. -

      U0073

      U1110

      (Radio and display receiver assembly)

      Back Guide 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

      • ECM

      • Main body ECU (multiplex network body ECU)

      • Steering sensor

      • Radio and display receiver assembly

      • Blind spot monitor sensor RH

      • Clearance warning ECU assembly

      • Control stops.

      • Rear crossing traffic alert function information is not displayed in back guide monitor function.

      • TOYOTA parking assist-sensor system information is not displayed in back guide monitor function.

      		 -

      U0100

      U0126

      U0140

      U0163

      U0233

      U1000

      U1110

      (Rear television camera 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)

      Vehicle speed judgment


      • Receives vehicle speed signals and changes the clearance sonar detection conditions accordingly.

      		 Clearance warning ECU assembly Combination meter assembly Clearance sonar detection will be operated based on a vehicle speed of 20 km/h (12 mph) or more. -

      U0155

      (Clearance warning ECU assembly)

      Distance Correction


      • Corrects distance measured using the ultra sonic sensors based on outside temperature signal.

      		 Clearance warning ECU assembly Air conditioning amplifier assembly Operation continues at the default outside temperature of 25°C (77°F). - -

      Vehicle Information Judgment


      • Judges existence of EV/HV vehicle, AT/MT, RHD/LHD or Eco-run, and switches control.

      		 Clearance warning ECU assembly

      • ECM

      • Main body ECU (multiplex network body ECU)

      • When AT/MT recognition stops: System operates with the previous value.

      • When a stop occurs after the ignition switch is turned to ON: The TOYOTA parking assist-sensor system does not operate.

      • The TOYOTA parking assist-sensor system does not operate.

      • Displays messages on the multi-information display.

      • The buzzer sounds.

      U0100

      (Clearance warning ECU assembly)

      Auto Away Function


      • Moves the steering wheel to the most retracted position and tilts to the top if the system detects the driver side seat belt is unfastened and the ignition switch is turned off.

      		 Multiplex tilt and telescopic ECU

      • Main body ECU (multiplex network body ECU)

      • Combination meter assembly

      		 Control is suspended (manual operation is still possible). -

      U014287

      U015587

      (Multiplex tilt and telescopic ECU)

      Auto Return Function


      • Returns the steering wheel to the position before the auto-away operation was performed (multiplex tilt and telescopic ECU memorized position) when the ignition switch is turned to ON or the driver side seat belt is fastened.

      		 Multiplex tilt and telescopic ECU

      • Main body ECU (multiplex network body ECU)

      • Combination meter assembly

      		 Control is suspended (manual operation is still possible). -

      U014287

      U015587

      (Multiplex tilt and telescopic ECU)

      Memory Control


      • Memorizes or recalls the steering wheel position in accordance with the operation of the memory switch.

      		 Multiplex tilt and telescopic ECU

      • Main body ECU (multiplex network body ECU)

      • Combination meter assembly

      • Position control ECU assembly RH

      		 Steering wheel does not return to memorized position. -

      U014287

      U015587

      U020887

      (Multiplex tilt and telescopic ECU)

      Mirror Operation Control


      • Controls the operation of the outer mirrors based on signals such as the mirror switch signal from the 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) Manual mirror operation is prohibited. -

      U0142

      (Outer mirror control ECU assembly (for driver side))

      U0142

      (Outer mirror control ECU assembly (for front passenger side))

      Reverse-shift Linked Door Mirror Operation


      • Controls the reverse operation of the outer mirrors based on reverse request information from the 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) Reverse-shift linked door mirror function does not operate. - -

      Mirror Surface Position Memory and Recall


      • Memorizes the mirror surface positions based on the memory request signal from the main body ECU (multiplex network body ECU) and adjusts the outer mirror surfaces to the memorized positions.

      • 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. - -

      Seat Position Memorization and Recall


      • Memorizes the seat position in accordance with the operation of the door switches. Also, moves the seat to the memorized position.

      		 Main body ECU (multiplex network body ECU)

      • Combination meter assembly

      • Multiplex tilt and telescopic ECU

      		 Seat position cannot be memorized or recalled. - -