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 System Related Fail-safe Operation Driver Detectable

      DTC Detection

      (ECU that stored DTC)

      Air Conditioning Control


      • Corrects engine speed, such as for idle up.

      • Controls outlet air temperature, outlet mode change and airflow volume based on engine coolant temperature signal.

      • Corrects engine coolant temperature map and changes compressor lock judgment value.

      		 Air conditioning amplifier assembly ECM Control is performed based on default coolant temperature of 80°C (176°F). -

      U0100

      (Air conditioning amplifier assembly)

      Compressor Control


      • Judges compressor lock according to engine speed.

      		 Air conditioning amplifier assembly ECM Control is performed based on default engine speed of 0 rpm. -

      U0100

      (Air conditioning amplifier assembly)

      Simple Load Control


      • Performs electric load control according to load control level signal.

      		 Air conditioning amplifier assembly Power steering ECU assembly Load control is not performed. -

      U0131

      (Air conditioning amplifier assembly)

      Panel Dimming Control


      • Outputs dimmer signal to LIN connected panels according to display dimmer signal.

      		 Air conditioning amplifier assembly Main body ECU (multiplex network body ECU) Dimming mode and non-dimming mode cannot be switched. -

      U0142

      (Air conditioning amplifier assembly)

      Destination Identification Control


      • Changes air conditioning control pattern according to destination.

      		 Air conditioning amplifier assembly Main body ECU (multiplex network body ECU) Maintains the latest state. -

      U0142

      (Air conditioning amplifier assembly)

      Insolation Correction Control


      • Changes air conditioning control pattern according to destination.

      		 Air conditioning amplifier assembly Main body ECU (multiplex network body ECU) Control is performed based on an insolation value of 0 after communication stop is confirmed. -

      U0142

      (Air conditioning amplifier assembly)

      Ambient Temperature Correction Control


      • Switches air conditioning system operation condition and corrects value of displayed ambient temperature according to vehicle speed signal.

      		 Air conditioning amplifier assembly Combination meter assembly Control is performed based on default vehicle speed of 0 km/h (0 mph).

      • Correction level for displayed ambient temperature declines.

      • Correction level for outlet airflow declines.

      U0155

      (Air conditioning amplifier assembly)

      Air Conditioning Eco Mode Control


      • Limits air conditioning system control.

      		 Air conditioning amplifier assembly ECM Maintains the latest state (Maintained in normal condition after reset). -

      U0100

      (Air conditioning amplifier assembly)

      Door Lock


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

      		 Main body ECU (multiplex network body ECU)

      • ECM

      • Combination meter assembly

      • Airbag ECU assembly

      • Speed sensitive automatic lock control does not occur.

      • Shift linked automatic lock control does not occur.

      • Automatic lock/unlock cannot be changed.

      		 -

      U0100

      U0101

      U0151

      U0155

      (Main body ECU (multiplex network body ECU))

      Display Automatic Dimming


      • Display dimming control.

      		 Main body ECU (multiplex network body ECU) Combination meter assembly Automatic dimming control for displays does not operate when taillights are turned on. -

      U0155

      (Main body ECU (multiplex network body ECU))

      Luggage Compartment Door Opener/Luggage Compartment Door Open Control


      • Accepts luggage compartment door opener request.

      		 Main body ECU (multiplex network body ECU)

      • ECM

      • Combination meter assembly

      		 Luggage compartment door does not open. -

      U0100

      U0101

      U0155

      (Main body ECU (multiplex network body ECU))
      Illumination Control Main body ECU (multiplex network body ECU)

      • ECM

      • Certification ECU (smart key ECU assembly)

      • Interior lights turn off.

      • Footwell illumination is turned off.

      • Interior lights do not turn off right after getting out of the vehicle.

      		 -

      U0101

      U0327

      (Main body ECU (multiplex network body ECU))
      Seat and Mirror Control Main body ECU (multiplex network body ECU)

      • Position control ECU and switch assembly RH (for RHD)

      • Position control ECU and switch assembly LH (for LHD)

      • Outer mirror control ECU assembly (for driver side)

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

      • Multiplex tilt and telescopic ECU

      • Combination meter assembly

      • Memory function does not operate.

      • Mirrors cannot be adjusted.

      		 -

      U0155

      U0199

      U0200

      U0208

      U1115

      (Main body ECU (multiplex network body ECU))
      Entry Function/Wireless Control Certification ECU (smart key ECU assembly) Main body ECU (multiplex network body ECU) Entry lock/unlock control is not possible. -

      U0327

      (Main body ECU (multiplex network body ECU))

      Engine System Indicator Display


      • Estimates whether injectors are clogged and requests that a message be displayed informing user that injectors need maintenance.

      • Estimates whether oil has deteriorated and requests that a message be displayed informing user that oil needs to be replaced.

      		 ECM Combination meter assembly

      • System is unable to inform user that oil needs to be replaced or injectors need maintenance.

      • Combination meter display cannot be cleared.

      • System is unable to inform user of brake override system control status.

      		 - -

      Electric Load Control


      • Performs idle up according to electric load.

      		 ECM

      • Air conditioning amplifier assembly

      • Power steering ECU assembly

      • Main body ECU (multiplex network body ECU)

      		 Idle up according to electric load is not performed. Not possible. (Idle speed changes.) -

      Air Conditioning Cooperative Operation


      • Performs idle up according to compressor load.

      • Performs air conditioning cut control.

      		 ECM Air conditioning amplifier assembly Air conditioning system does not use cooperative controls. (Idle up is not performed.) Air conditioning system does not operate. -

      Charge Control


      • Performs idle up according to charging request.

      		 ECM Air conditioning amplifier assembly Idle up according to charging request is not performed. Taillights flicker and blower airflow changes. -

      Eco Control


      • Adjusts throttle response in consideration of actual fuel economy.

      		 ECM Combination meter assembly Eco mode does not operate. - -

      ECT System Indicator Display


      • Meter display (Displays shift position, states of switches, system modes, etc.)

      		 ECM Combination meter assembly Indicator light does not illuminate. - -

      Neutral Control


      • Reduces engine load and performs idle up.

      		 ECM

      • Skid control ECU (brake actuator assembly)

      • Yaw rate sensor

      		 Neutral control is not performed. - -

      Coast Downshift Timing Change According to Air Conditioning Load


      • Delays upshifts according to warm-up request.

      		 ECM Air conditioning amplifier assembly

      • Coast downshift does not occur.

      • Coast downshift shock reduction performance deteriorates.

      		 - -

      Cruise Control


      • Controls vehicle speed by adjusting throttle valve angle automatically.

      		 ECM

      • Skid control ECU (brake actuator assembly)

      • Driving support ECU assembly

      • Combination meter assembly

      		 Cruise control does not operate. Displays messages on the multi-information display.

      U010487

      U012287

      (ECM)

      Stop and Start Control


      • Starts and stops the engine using the stop and start control.

      		 ECM Engine stop and start ECU Stop and start control does not operate. Displays messages on the multi-information display.

      U110387

      (ECM)

      Power Steering Control


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

      		 Power steering ECU assembly

      • ECM

      • Skid control ECU (brake actuator assembly)

      • Yaw rate sensor

      • Steering sensor

      		 Assist force restricted. -

      U0100

      U0129

      (Power steering ECU assembly)

      VDIMα System


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

      • Skid control ECU (brake actuator assembly)

      • Power steering ECU assembly

      		 Skid control ECU (brake actuator assembly) VDIMα control is stopped. - -

      VDIMβ System


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

      • Skid control ECU (brake actuator assembly)

      • Front steering control ECU

      • Power steering ECU assembly

      • Skid control ECU (brake actuator assembly)

      • Front steering control ECU

      • Steering sensor

      		 VDIMβ control is stopped. EPS warning light illuminates.

      U0129

      U0130

      (Power steering ECU assembly)

      Entry Function


      • Entry lock/unlock, entry luggage compartment open.

      • Warning

      • Performs entry illumination (Interior illumination etc.).

      • Main body ECU (multiplex network body ECU)

      • Certification ECU (smart key ECU assembly)

      • Main body ECU (multiplex network body ECU)

      • Combination meter assembly

      • ECM

      		 Entry unlock is performed again.

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

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

      • Entry illumination does not operate.

      U0100

      U0142

      U0155

      (Certification ECU (smart key ECU assembly))
      Entry Function/Wireless Control Main body ECU (multiplex network body ECU)

      • Main body ECU (multiplex network body ECU)

      • Certification ECU (smart key ECU assembly)

      		 Entry lock/unlock control is not possible. -

      U0327

      (Main body ECU (multiplex network body ECU))

      Engine Switch Backlighting Control


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

      		 Certification ECU (smart key ECU assembly) Main body ECU (multiplex network body ECU) Engine switch backlighting does not illuminate according to interior lights operation. -

      U0142

      (Certification ECU (smart key ECU assembly))

      Security Indicator Display Function


      • Displays immobiliser and security status.

      		 Certification ECU (smart key ECU assembly) Main body ECU (multiplex network body ECU) Security indicator cannot display security status correctly (security indicator blinks or illuminates when in armed state or alarm sounding state). -

      U0142

      (Certification ECU (smart key ECU assembly))
      Vehicle Speed Display Combination meter assembly Skid control ECU (brake actuator assembly)

      • Speedometer is controlled based on a default vehicle speed of 0 km/h (0 mph).

      • Drive monitor calculation is stopped.

      		 -

      U0129

      (Combination meter assembly)
      Tachometer Display Combination meter assembly ECM None

      • Needle of tachometer remains at 0 rpm.

      • Drive monitor calculation is stopped.

      U0100

      (Combination meter assembly)
      Engine Coolant Temperature Receiver Gauge Control Combination meter assembly ECM None Engine coolant temperature receiver gauge is at the middle or below. -

      Meter Display


      • Displays vehicle condition and controls indicator lights.

      		 Combination meter assembly

      • ECM

      • Skid control ECU (brake actuator assembly)

      • Airbag ECU assembly

      • Main body ECU (multiplex network body ECU)

      • Power steering ECU assembly

      • Front steering control ECU

      • Headlight leveling ECU assembly

      • Driving support ECU assembly

      • Forward recognition camera

      		 Lights do not illuminate or lights remain illuminated, or messages are displayed. Illuminated indicator lights or displayed messages do not match the actual vehicle condition.

      U0100

      U0129

      U0130

      U0131

      U0142

      U0151

      U0182

      U023A

      U1104

      (Combination meter assembly)

      Buzzer


      • Controls sounding of buzzer for various functions.

      		 Combination meter assembly

      • Main body ECU (multiplex network body ECU)

      • Airbag ECU assembly

      • Skid control ECU (brake actuator assembly)

      • Power steering ECU assembly

      • ECM

      		 Buzzer stops sounding or does not sound. None

      U0100

      U0129

      U0131

      U0151

      U023A

      (Combination meter assembly)

      Destination Identification


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

      		 Combination meter assembly Main body ECU (multiplex network body ECU) None -

      U0142

      (Combination meter assembly)

      Linking-up with Multi-information Display


      • Displays navigation, audio, telephone, etc.

      		 Combination meter assembly Radio receiver assembly None -

      U0163

      (Combination meter assembly)

      Pedestrian Protection Function (Pop-up Hood)


      • Raises the engine hood in the event of frontal collision to protect pedestrian.

      		 Airbag ECU assembly

      • Steering sensor

      • Front steering control ECU

      • Skid control ECU (brake actuator assembly)

      • Yaw rate sensor

      		 Airbag ECU assembly prohibits pedestrian protection function and performs calculations accordingly. -

      U0125

      U0126

      U0129

      U0130

      (Airbag ECU assembly)
      ABS control Skid control ECU (brake actuator assembly) Yaw rate sensor

      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 illuminates.

      U0073

      U0124

      (Skid control ECU (brake actuator assembly))
      VSC/TRC/VDIM control Skid control ECU (brake actuator assembly)

      • ECM

      • Yaw rate sensor

      • Steering sensor

      • Front steering control ECU

      • Rear steering control ECU

      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 illuminates.

      U0073

      U0100

      U0124

      U0126

      U0130

      U0134

      (Skid control ECU (brake actuator assembly))

      Hill-start Assist Control


      • Maintains the brake hydraulic pressure to the 4 wheels for 2 seconds with the brake pedal released when starting off on an uphill.

      		 Skid control ECU (brake actuator assembly)

      • ECM

      • Yaw rate sensor

      • Steering sensor

      		 Control cannot be performed.

      • Brake warning light illuminates.

      • ABS warning light illuminates.

      • Slip indicator illuminates.

      U0073

      U0100

      U0124

      U0126

      (Skid control ECU (brake actuator assembly))

      Headlight Leveling Control (Headlight Control)


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

      • Headlight leveling ECU assembly (for Single Beam Headlight)

      • Headlight light control ECU sub-assembly LH (for Triple Beam Headlight)

      • Skid control ECU (brake actuator assembly)

      • Main body ECU (multiplex network body ECU)

      		 Headlight leveling control is stopped. -

      U0129

      U0142

      (Headlight leveling ECU assembly (for Single Beam Headlight))

      (Headlight light control ECU sub-assembly LH (for Triple Beam Headlight))

      VGRS Control


      • Changes the steering gear ratio according to the vehicle speed information and steering angle.

      		 Front steering control ECU

      • ECM

      • Yaw rate sensor

      • Steering sensor

      • Power steering ECU assembly

      • Skid control ECU (brake actuator assembly)

      • Rear steering control ECU

      		 VGRS control is stopped. Displays messages on the multi-information display.

      U0100

      U0101

      U0125

      U0126

      U0129

      U0131

      U0134

      (Front steering control ECU)

      AVS Control


      • Controls the variable damping force according to road and driving conditions.

      		 Absorber control ECU

      • ECM

      • Yaw rate sensor

      • Front steering control ECU

      • Steering sensor

      • Skid control ECU (brake actuator assembly)

      • Engine stop and start ECU

      • Continues to control the damping force.

      • Interrupts damping force control after moving front absorber control actuators and rear absorber control actuators to the 9th step.

      • Controls continue except roll control.

      		 -

      U0100

      U0101

      U0122

      U0124

      U0126

      U0130

      U1103

      (Absorber control ECU)

      ARS Control


      • Controls the steering angle of the rear wheels according to the target steering angle which the front steering control ECU calculates based on the vehicle speed and steering wheel input.

      		 Rear steering control ECU

      • ECM

      • Front steering control ECU

      • Skid control ECU (brake actuator assembly)

      		 ARS control is stopped. Displays messages on the multi-information display.

      U0100

      U0129

      U0130

      (Rear steering control ECU)

      Air Conditioning Control


      • Function that controls each air conditioning function.

      		 Radio receiver assembly Air conditioning amplifier assembly

      • Air conditioning system indicators turn off.

      • If set temperature is shown on multi-information display or multi-display, set temperature display turns off.

      		 -

      U0073

      U0164

      (Radio receiver assembly)

      LEXUS Parking Assist-sensor System Setting/Notification


      • Controls the settings for the clearance sonar screen notifications.

      		 Radio receiver assembly Clearance warning ECU assembly Display updating is stopped. -

      U0073

      U1110

      (Radio receiver assembly)

      Fuel Consumption Display


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

      		 Radio receiver assembly

      • ECM

      • Skid control ECU (brake actuator assembly)

      • Combination meter assembly

      • Fuel consumption calculation is not possible. The calculated data is discarded, and per-minute fuel consumption calculation resumes when correct data is received.

      • 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 receiver assembly)

      Destination Identification


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

      		 Radio receiver assembly Main body ECU (multiplex network body ECU) Time zone and language selection screen are different from actual destination. -

      U0073

      U0140

      (Radio receiver assembly)

      Smart Camera Function


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

      		 Radio receiver assembly

      • ECM

      • Rear television camera assembly

      		 Screen does not change to the camera screen. -

      U0073

      U0265

      (Radio receiver assembly)

      Power Tilt and Power Telescopic Steering Column Control


      • Starts steering wheel auto return or auto away based on an engine switch on/off signal or equivalent.

      • Memorizes and recalls selected driving position according to memory switch operation.

      • Moves steering wheel to selected position according to manual switch operation on steering column cover.

      		 Multiplex tilt and telescopic ECU

      • Main body ECU (multiplex network body ECU)

      • Position control ECU and switch assembly LH (for LHD)

      • Position control ECU and switch assembly RH (for RHD)

      • Driving position memory function is prohibited.

      • Auto away/return function is prohibited.

      		 -

      U0142

      U0208

      (Multiplex tilt and telescopic ECU)

      Seat Position Memory System


      • Controls the seat position based on operation conditions.

      • Position control ECU and switch assembly LH (for LHD)

      • Position control ECU and switch assembly RH (for RHD)

      • Main body ECU (multiplex network body ECU)

      • ECM

      • Combination meter assembly

      • Multiplex tilt and telescopic ECU

      		 Controls the seat position based on operation conditions. - -
      Mirror Surface Adjustment

      • Outer mirror control ECU assembly (for driver side)

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

      		 Main body ECU (multiplex network body ECU) Mirror surface position cannot be memorized or recalled. -

      U0142

      (Outer mirror control ECU assembly)
      Mirror Heaters

      • Outer mirror control ECU assembly (for driver side)

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

      • Main body ECU (multiplex network body ECU)

      • Air conditioning amplifier assembly

      		 Mirror heaters do not operate. -

      U0142

      (Outer mirror control ECU assembly)

      Mirror Retract/Return Operation


      • Controls retract/return operation of the outer mirrors based on signals such as mirror switch signal from main body ECU.

      • Outer mirror control ECU assembly (for driver side)

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

      		 Main body ECU (multiplex network body ECU) Mirrors cannot be retracted or returned. - -
      Reverse-shift Linked Door Mirror Operation

      • Outer mirror control ECU assembly (for driver side)

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

      		 Main body ECU (multiplex network body ECU) Reverse-shift linked door mirror function does not operate. -

      U0142

      (Outer mirror control ECU assembly)
      Mirror Surface Position Memory and Recall

      • Outer mirror control ECU assembly (for driver side)

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

      		 Main body ECU (multiplex network body ECU) Mirror surface position cannot be memorized or recalled. -

      U0142

      (Outer mirror control ECU assembly)

      Seat Memory Switch Signal Forwarding


      • Transmits memory switch signal via the CAN bus.

      		 Main body ECU (multiplex network body ECU)

      • Outer mirror control ECU assembly (for driver side)

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

      		 Seat position memory settings cannot be memorized or recalled. - -

      Dynamic Radar Cruise Control System


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

      		 Driving support ECU assembly

      • ECM

      • Yaw rate sensor

      • Steering sensor

      • Skid control ECU (brake actuator assembly)

      • Active cruise control is canceled.

      • Fail-safe function operates only during active cruise control.

      • Warning message is displayed or cruise control indicator illuminates (yellow) (when cruise control main switch is on).

      • Buzzer sounds (cycle: 0.2 sec., number of times buzzer sounds: 2).

      U0100

      U0125

      U0126

      U0129

      U0235

      U1104

      (Driving support ECU assembly)

      Pre-collision System


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

      		 Driving support ECU assembly

      • ECM

      • Yaw rate sensor

      • Steering sensor

      • Skid control ECU (brake actuator assembly)

      • Millimeter wave radar sensor assembly

      • Forward recognition camera

      • Driving support ECU assembly

      		 Control stops.

      • Displays messages on the multi-information display.

      • PCS warning light illuminates.

      U0100

      U0125

      U0126

      U0129

      U0235

      U023A

      U1002

      U1104

      (Driving support ECU assembly)

      Pre-collision System


      • Outputs information regarding the detection of vehicles and pedestrians to the driving support ECU assembly.

      		 Forward recognition camera

      • ECM

      • Yaw rate sensor

      • Skid control ECU (brake actuator assembly)

      • Rear steering control ECU

      • Main body ECU (multiplex network body ECU)

      • Millimeter wave radar sensor assembly

      • 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.

      • Displays messages on the multi-information display.

      • PCS warning light illuminates.

      U0100

      U0123

      U0129

      U0134

      U0142

      U0235

      U1104

      (Forward recognition camera)

      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

      • ECM

      • Yaw rate sensor

      • Steering sensor

      • Skid control ECU (brake actuator assembly)

      • Front steering control ECU

      • Power steering ECU assembly

      • Rear steering control ECU

      • Main body ECU (multiplex network body ECU)

      • Combination meter assembly

      • Millimeter wave radar sensor assembly

      • Driving support ECU assembly

      		 Lane departure alert system control stops.

      • Lane departure alert indicator light (yellow) illuminates.

      • Displays messages on the multi-information display.

      U0100

      U0101

      U0123

      U0126

      U0129

      U0130

      U0131

      U0134

      U0142

      U0155

      U0235

      U023A

      U1104

      (Forward recognition camera)

      Automatic High Beam System


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

      		 Forward recognition camera

      • ECM

      • Yaw rate sensor

      • Skid control ECU (brake actuator assembly)

      • Rear steering control ECU

      • Main body ECU (multiplex network body ECU)

      • Millimeter wave radar sensor assembly

      		 Maintains the same condition. Displays messages on the multi-information display.

      U0100

      U0101

      U0123

      U0129

      U0134

      U0142

      U0235

      (Forward recognition camera)

      Road Sign Assist Function


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

      		 Forward recognition camera

      • ECM

      • Yaw rate sensor

      • Skid control ECU (brake actuator assembly)

      • Rear steering control ECU

      • Main body ECU (multiplex network body ECU)

      • Combination meter assembly

      		 Road sign assist function is canceled.

      • Master warning light illuminates.

      • Displays messages on the multi-information display.

      U0100

      U0101

      U0123

      U0129

      U0134

      U0142

      U0155

      (Forward recognition camera)

      LEXUS Parking Assist-sensor System Control


      • Judges vehicle speed.

      		 Clearance warning ECU assembly Combination meter assembly Obstacle detection is stopped. -

      U0155

      (Clearance warning ECU assembly)

      Shift position judgment


      • Uses received shift position signal as a clearance sonar detection operation condition.

      		 Clearance warning ECU assembly ECM Control operates with the default shift position (P). -

      U0101

      (Clearance warning ECU assembly)

      Voice Warning Availability Confirmation


      • Uses destination code and steering wheel information for determining availability of voice warning for clearance sonar.

      		 Clearance warning ECU assembly Main body ECU (multiplex network body ECU) Assumes that there is no voice warning. - -

      Blind Spot Monitor Control


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

      		 Blind spot monitor sensor LH

      • ECM

      • Skid control ECU (brake actuator assembly)

      • Steering sensor

      • Main body ECU (multiplex network body ECU)

      • Yaw rate sensor

      		 None Displays messages on the multi-information display.

      U0100

      U0125

      U0126

      U0129

      U0142

      (Blind spot monitor sensor LH)

      Parking Assist Monitor


      • Monitors the shift position signal, steering angle signal and vehicle speed, and displays the predicted path guide lines on the screen based on the steering angle when reversing.

      		 Rear television camera assembly

      • ECM

      • Steering sensor

      • Front steering control ECU

      • Main body ECU (multiplex network body ECU)

      • Radio receiver assembly

      • Blind spot monitor sensor LH

      • Clearance warning ECU assembly

      • Predicted path guide lines are not displayed.

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

      • Displays the RCTA communication malfunction indicator.

      		 "!" is displayed on the screen.

      U0100

      U0126

      U0130

      U0140

      U0163

      U0233

      U1110

      (Rear television camera assembly)

      ASC System


      • Outputs simulated engine sounds in accordance with vehicle driving condition.

      		 Stereo component equalizer assembly

      • Main body ECU (multiplex network body ECU)

      • Skid control ECU (brake actuator assembly)

      • ECM

      		 Simulated engine sound output is stopped. -

      U0100

      U0122

      U0142

      (Stereo component equalizer assembly)

      Stop and Start System


      • Stops the engine when the vehicle is stationary.

      		 Engine stop and start ECU

      • Air conditioning amplifier assembly

      • Skid control ECU (brake actuator assembly)

      • ECM

      • Power steering ECU assembly

      • Main body ECU (multiplex network body ECU)

      • Airbag ECU assembly

      • Combination meter assembly

      • Steering sensor

      • Driving support ECU assembly

      • Clearance warning ECU assembly

      • When driving in eco drive mode, the engine starts.

      • When not driving in eco drive mode, eco drive cannot be performed.

      		 Displays messages on the multi-information display.

      U0100

      U0104

      U0121

      U0123

      U0126

      U0131

      U0132

      U0140

      U0151

      U0164

      (Engine stop and start ECU)

      ERA-GLONASS (except G-BOOK)


      • Makes an emergency call to the center and notifies an operator of the vehicle location when deployment of an airbag is detected or the manual (SOS) switch is pressed.

      		 Telematics transceiver ECM When communication with the ECM is lost or there is a communication error, the manual (SOS) switch indicator (red) illuminates. -

      U0100

      (Telematics transceiver)