CAN COMMUNICATION SYSTEM FAIL-SAFE CHART

  1. FAIL-SAFE FUNCTION

    1. When communication fails in any of the CAN bus wires (communication wires), a fail-safe function(s) operates. The fail-safe function that is specified for each system operates to prevent those systems from malfunctioning.

    2. Effects on each system when communication is impossible (for further details, see the pages for each system).

      Function

      (Function Description)

      1. Control Master

      2. System Related

      Behavior in Communication Failure

      User Notification

      Diagnostic Trouble Code

      Kinetic Dynamic Suspension System

      (Opens and closes the accumulator valve to suppress roll.)

      1. Stabilizer control ECU

      2. ECM, Master cylinder solenoid (skid control ECU), Spiral with sensor cable sub-assembly, Yaw rate sensor assembly, Suspension control ECU

      • U0100: Control continues.

      • U0122: The accumulator valve is open.

      • U0124: Control continues using only the steering angle sensor signal.

      • U0126: Control continues using only the yaw rate signal.

      The kinetic dynamic suspension system indicator light turns on.

      • U0100

      • U0122

      • U0124

      • U0126

      Vehicle Height Control

      (Performs vehicle height adjustments.)

      1. Suspension control ECU

      2. ECM, Master cylinder solenoid (skid control ECU), Spiral with sensor cable sub-assembly, Yaw rate sensor assembly, Four wheel drive control ECU, Display and navigation module display, Main body ECU (multiplex network body ECU), Driving support ECU assembly

      • U0100: Control continues operation.

      • U0114: Control continues operation.

      • U0122: The normal vehicle height is maintained.

      • U0124: Control continues operation.

      • U0126: Control continues operation.

      • U0140: Control continues operation.

      • U0100: Nothing

      • U0114: Nothing

      • U0122: The warning is displayed.

      • U0124: Nothing

      • U0126: Nothing

      • U0140: Nothing

      • U0100

      • U0114

      • U0122

      • U0124

      • U0126

      • U0140

      Damping Force Control

      (Controls the variable damping force depending on the vehicle state.)

      1. Suspension control ECU

      2. ECM, Master cylinder solenoid (skid control ECU), Spiral with sensor cable sub-assembly, Yaw rate sensor assembly, Four wheel drive control ECU, Display and navigation module display, Main body ECU (multiplex network body ECU), Driving support ECU assembly

      • U0100: Control continues.

      • U0114: Control continues.

      • U0122: The damper steps become fixed.

      • U0124: Roll suppression stops.

      • U0126: The damper steps become fixed.

      • U0140: Control continues operation.

      The warning is displayed.

      • U0100

      • U0114

      • U0122

      • U0124

      • U0126

      • U0140

      High-Low Switching Limitation

      (Prohibits high-low switching when the vehicle speed or engine speed is outside the acceptable range or the A/T is not in N during the A/T status check.)

      1. Four wheel drive control ECU

      2. ECM, Master cylinder solenoid (skid control ECU)

      High-low switching is prohibited.

      The 4LO indicator light blinks and the buzzer sounds.

      -

      Center Differential Lock Switching Limitation

      (Prohibits center differential lock switching when the difference in wheel speeds is large.)

      1. Four wheel drive control ECU

      2. Master cylinder solenoid (skid control ECU)

      Prohibits center differential lock switching.

      The center differential lock indicator light blinks.

      -

      L4F Switching Limitation

      (Prohibits switching to L4F when VSC is malfunctioning.)

      1. Four wheel drive control ECU

      2. Master cylinder solenoid (skid control ECU)

      L4F switching is prohibited.

      The 4LO indicator light blinks.

      -

      Specialized Control during Wheel Speed Failure

      (When there is abnormal wheel speed, this control permits switching only when specified conditions are met (not all wheel speeds are abnormal, the brakes are applied, the engine speed is low and all normal wheel speeds are low).)

      1. Four wheel drive control ECU

      2. ECM, Master cylinder solenoid (skid control ECU)

      When all 4 wheels are malfunctioning, switching is prohibited.

      The 4LO indicator light blinks quickly.

      -

      Indicator/Buzzer Signal Output

      (Outputs a signal indicating the indicator and buzzer state, which is used to determine the actuator position and switching status.)

      1. Four wheel drive control ECU

      2. -

      State signal update is not possible.

      Nothing

      -

      H-L Actuator Failure Signal Output

      (Outputs a signal when the H-L actuator limit switch is malfunctioning.)

      1. Four wheel drive control ECU

      2. -

      State signal update is not possible.

      Nothing

      -

      Cruise Control Cancel Signal Output

      (Outputs a cruise control cancel signal when center differential switching is not completed even though 5 seconds or more have elapsed from the start of switching.)

      1. Four wheel drive control ECU

      2. -

      State signal update is not possible.

      Nothing

      -

      L4 State Signal Output

      (Outputs a signal when switching to the L4 position is finished.)

      1. Four wheel drive control ECU

      2. -

      State signal update is not possible.

      Nothing

      -

      Center Differential Lock State Signal Output

      (Outputs the center differential lock P/S state.)

      1. Four wheel drive control ECU

      2. -

      State signal update is not possible.

      Nothing

      -

      Signal Output during Switching

      (Outputs the actuator switching state.)

      1. Four wheel drive control ECU

      2. -

      State signal update is not possible.

      Nothing

      -

      Multi-terrain Select Output

      (Outputs the signal to stop the multi-terrain select service.)

      1. Four wheel drive control ECU

      2. -

      State signal update is not possible.

      Nothing

      -

      Entry Functions

      (Operates the entry lock/unlock, entry trunk open/entry back door unlatch and entry warning/illumination functions.)

      1. Certification ECU, Main body ECU (multiplex network body ECU)

      2. Certification ECU, Main body ECU (multiplex network body ECU)

      The entry functions do not operate.

      Nothing

      U0142

      Wireless Functions

      (Operates the wireless lock/unlock, trunk and panic functions.)

      1. Main body ECU (multiplex network body ECU)

      2. Certification ECU, Main body ECU (multiplex network body ECU)

      The wireless functions do not operate.

      Nothing

      U0142

      Remote Engine

      Start Function (Grants immobiliser unset permission in response to data from the remote engine start ECU.)

      1. -

      2. Certification ECU

      The remote engine start does not operate.

      Nothing

      B2779 (stored only as a current DTC)

      Remote Service Function

      (Locks the vehicle doors, etc. using a cellular phone when a smart key is not inside the vehicle.)

      1. Display and navigation module display

      2. Certification ECU, Display and navigation module display, Main body ECU (multiplex network body ECU)

      The remote service function does not operate.

      Nothing

      U0142

      Engine Switch Illumination Control

      (Turns the engine switch illumination on/off.)

      1. Certification ECU

      2. Main body ECU (multiplex network body ECU)

      The engine switch illumination does not operate.

      Nothing

      U0142

      Memory Function

      (Moves the seat, steering wheel and outer mirrors to a previously memorized position when an entry or wireless unlock operation is performed.)

      1. Main body ECU (multiplex network body ECU)

      2. ECM, Certification ECU, Front power seat switch LH, Multiplex tilt and telescopic ECU, Outer mirror ECU assembly LH, Outer mirror ECU assembly RH

      The memory functions do not operate.

      Nothing

      U0142

      VAST Function

      (Changes settings based on previously stored driver information.)

      1. Main body ECU (multiplex network body ECU)

      2. Certification ECU

      Driver identification is not performed.

      Nothing

      U0142

      Microcomputer Preset Steering

      (Controls the operation of the autoaway/return function and memorized driver position restoration function activated by the insertion or removal of the key or a seat belt buckle.)

      1. Multiplex tilt and telescopic ECU

      2. Combination meter assembly, Main body ECU (multiplex network body ECU), Front power seat switch LH

      The power tilt and power telescopic steering column system and its memory and restore functions do not operate.

      Nothing

      • B2621

      • B2624

      A/C Control

      (Controls various air conditioning functions, such as vent selection and temperature adjustment, using the touch panel switches in the multi-display.)

      1. Display and navigation module display

      2. Air conditioning amplifier assembly

      • No response to switch operations.

      • The outside temperature and set temperature do not change.

      A screen is displayed.

      • U0073

      • U0164

      LEXUS Parking Assist-sensor System

      (Controls the settings for the LEXUS parking assist screen notifications performed by operating the touch panel switches of the multi-display, displays the sonar status and plays voice warnings.)

      1. Display and navigation module display

      2. Parking assist ECU (w/ LEXUS Parking Assist-sensor System [w/ Parking Assist Monitor System and/or Side Monitor System]), Clearance warning ECU assembly (w/ LEXUS Parking Assist-sensor System [w/o Parking Assist Monitor System and/or Side Monitor System])

      • No response to switch operations.

      • The settings screen display is cleared.

      Icons are cleared from the display screen.

      • U0073

      • U1110

      Eco Navigation Display

      (Displays the average fuel consumption history and a graph indicating the fuel consumption in 1 minute intervals and the regeneration power amount.)

      1. Display and navigation module display

      2. ECM, Master cylinder solenoid (skid control ECU), Combination meter assembly

      Stops updating the eco navigation display.

      Nothing

      • U0073

      • U0155

      Destination Determination

      (Determines the destination of the vehicle and selects the display language, time zone, etc.)

      1. Display and navigation module display

      2. Main body ECU (multiplex network body ECU)

      Determines the destination based on information from before the communication stop.

      Nothing

      U0073

      Remote Service Function

      Remote Diagnosis Function Maintenance Notification Function (Notifies the user when user action is necessary.)

      1. Display and navigation module display

      2. ECM, Master cylinder solenoid (skid control ECU), Four wheel drive control ECU, Combination meter assembly, Power management control ECU, Certification ECU, Center airbag sensor assembly, Main body ECU (multiplex network body ECU), Air conditioning amplifier assembly, Seat belt control ECU, Driving support ECU assembly, Parking assist ECU

      An invalid flag is set.

      The driver is informed of invalid flag information.

      U0073

      Vehicle Customize Function

      (Changes the behavior and control parameters of various functions according to the user via the multi-display screen.)

      1. Display and navigation module display

      2. Certification ECU, Main body ECU (multiplex network body ECU), Air conditioning amplifier assembly, Front power seat switch LH

      Customize functions are performed with the combination meter.

      Nothing

      U0073

      ABS Control

      (Controls the ABS according to the G sensor signal.)

      1. Master cylinder solenoid (skid control ECU)

      2. Yaw rate sensor assembly

      The ABS does not operate.

      The ABS warning light and SLIP indicator light turns on.

      • U0073

      • U0114

      • U0123

      • U0124

      TRC Control

      (Controls the brakes and engine torque during acceleration slip.)

      1. Master cylinder solenoid (skid control ECU)

      2. ECM

      TRC does not operate.

      • U0073, U0114, U0124: The ABS warning light and SLIP indicator light turns on.

      • U0100, U0123, U0126: The SLIP indicator light turns on.

      • U0073

      • U0100

      • U0114

      • U0123

      • U0124

      • U0126

      VSC Control

      (Controls VSC according to the yaw rate sensor and steering angle sensor signals.)

      1. Master cylinder solenoid (skid control ECU)

      2. ECM, Spiral with sensor cable sub-assembly, Yaw rate sensor assembly

      VSC does not operate.

      • U0073, U0114, U0124: The ABS warning light and SLIP indicator light turns on.

      • U0100, U0123, U0126: The SLIP indicator light turns on.

      • U0073

      • U0100

      • U0114

      • U0123

      • U0124

      • U0126

      ACC Control

      (Controls the brakes according to requests from the distance control ECU sent via the ECM.)

      1. Master cylinder solenoid (skid control ECU)

      2. ECM

      ACC does not operate.

      The radar cruise indicator light turns on.

      U0073

      Rear View Monitor

      (Displays guide lines on the rear view monitor screen automatically when the display conditions are met (shift position, etc.).)

      1. Parking assist ECU

      2. ECM, Master cylinder solenoid (skid control ECU), Spiral with sensor cable subassembly, Main body ECU (multiplex network body ECU)

      During adjustment, the course lines cannot be adjusted.

      "Guidance unavailable." is displayed at the bottom of the screen.

      • U0073

      • U0100

      • U0126

      • U0140

      Wide View Front and Side Monitor

      (Displays the front and side camera images on the screen automatically and manually when the display conditions are met (vehicle speed, shift position, etc.).)

      1. Parking assist ECU

      2. ECM, Master cylinder solenoid (skid control ECU), Spiral with sensor cable sub-assembly, Four wheel drive control ECU, Main body ECU (multiplex network body ECU), Driver support switch control ECU

      When the mirrors are retracted, the side camera image displayed on the screen does not match with the orientation of the side mirrors.

      "Guidance unavailable." is displayed at the bottom of the screen.

      • U0073

      • U0100

      • U0126

      • U0129

      • U0140

      • U0155

      Multi-terrain Monitor

      (Displays the front and side camera images on the screen automatically and manually when the display conditions are met (vehicle speed, shift position, etc.).)

      1. Parking assist ECU

      2. ECM, Master cylinder solenoid (skid control ECU), Spiral with sensor cable sub-assembly, Four wheel drive control ECU, Main body ECU (multiplex network body ECU), Driver support switch control ECU

      • When the camera screen is being displayed, the screen changes to the navigation screen.

      • When the camera screen is not displayed, switching to the camera screen is disabled.

      "Guidance unavailable." is displayed at the bottom of the screen.

      • U0073

      • U0100

      • U0126

      • U0129

      • U0140

      • U0155

      • U1114

      LEXUS Parking Assist-sensor System Coordinated Control

      (Displays information detected from the LEXUS parking assist-sensor system on the rear view monitor screen, etc.)

      1. Clearance warning ECU assembly

      2. Clearance warning ECU assembly

      -

      While the side monitor is displayed, an icon indicating that there is a malfunction is displayed instead of the normal icon.

      • U0073

      • U1110

      Steering Sensor

      (Detects the steering wheel angle.)

      1. Spiral with sensor cable sub-assembly

      2. Master cylinder solenoid (skid control ECU)

      -

      The VSC OFF indicator light turns on.

      -

      LEXUS Parking Assist-sensor System

      (Receives object detection information from the sensors and sounds a buzzer and displays information according to the distance to the detected object.)

      1. Clearance warning ECU assembly

      2. ECM, Combination meter assembly, Display and navigation module display, Main body ECU (multiplex network body ECU), Air conditioning amplifier assembly, Clearance warning ECU assembly

      Object detection stops.

      Nothing

      • U0100

      • U0101

      • U0155

      Speedometer

      (Controls the speedometer according to the vehicle speed signals.)

      1. Combination meter assembly

      2. Master cylinder solenoid (skid control ECU)

      0 km/h (0 mph) is indicated.

      The behavior during the communication failure alerts the user.

      U0129

      Tachometer

      (Controls the tachometer according to the engine speed signals.)

      1. Combination meter assembly

      2. ECM

      0 rpm is indicated.

      The behavior during the communication failure alerts the user.

      U0100

      Engine Coolant Temperature Gauge

      (Controls the temperature gauge according to the temperature signals.)

      1. Combination meter assembly

      2. ECM

      The temperature gauge needle is at the middle of the "C" mark or below.

      Nothing

      U0100

      Fuel Gauge

      (Controls the fuel gauge according to the vehicle condition determined by the ST signal, vehicle speed signal and fuel amount.)

      1. Combination meter assembly

      2. ECM, Master cylinder solenoid (skid control ECU)

      • Operates the same as when the vehicle is stopped.

      • Operates with ST set to off.

      Nothing

      • U0100

      • U0129

      ODO/TRIP Meter

      (Calculates and indicates the driven distance according to the pulse count of the vehicle speed pulse signal.)

      1. Combination meter assembly

      2. Master cylinder solenoid (skid control ECU)

      The calculation stops and the last displayed value remains.

      Nothing

      U0129

      Shift Display

      (Displays the shift information according to the shift position signal.)

      1. Combination meter assembly

      2. ECM

      The shift display turns off.

      Nothing

      U0100

      Telltale

      (Controls the indicator illumination and blinking according to the CAN signals and direct line input signals.)

      1. Combination meter assembly

      2. ECM, Master cylinder solenoid (skid control ECU), Four wheel drive control ECU, Certification ECU, Center airbag sensor assembly, Stabilizer control ECU, Main body ECU (multiplex network body ECU), Seat belt control ECU, Headlight swivel ECU assembly (AFS ECU)

      -

      An indicator or warning light turns on.

      • U0100

      • U0129

      • U0142

      • U0151

      Buzzers

      (Controls the buzzer sounding according to the CAN signals and direct line input signals.)

      1. Combination meter assembly

      2. ECM, Master cylinder solenoid (skid control ECU), Four wheel drive control ECU, Certification ECU, Center airbag sensor assembly, Main body ECU (multiplex network body ECU)

      -

      A buzzer sounds.

      • U0100

      • U0129

      • U0142

      • U0151

      Drive Monitor

      (Performs calculations and displays drive monitor information according to the fuel injection volume and pulse count of the vehicle pulse signal.)

      1. Combination meter assembly

      2. ECM, Master cylinder solenoid (skid control ECU), Main body ECU (multiplex network body ECU)

      Drive monitor calculations stop and the display is blank.

      Nothing

      • U0100

      • U0129

      • U0142

      Multi-display Control

      (Controls the multi-display based on CAN and direct line signals.)

      1. Combination meter assembly

      2. ECM, Master cylinder solenoid (skid control ECU), Certification ECU, Main body ECU (multiplex network body ECU), Seat belt control ECU, Driving support ECU assembly, Suspension control ECU, Parking assist ECU (w/ LEXUS Parking Assist-sensor System [w/ Parking Assist Monitor System and/or Side Monitor System]), Clearance warning ECU assembly (w/ LEXUS Parking Assist-sensor System [w/o Parking Assist Monitor System and/or Side Monitor System])

      -

      A light turns on.

      • U0100

      • U0129

      • U0142

      A/C Control

      (Controls the air conditioning according to engine coolant temperature information.)

      1. Air conditioning amplifier assembly

      2. ECM, Combination meter assembly, Display and navigation module display, Main body ECU (multiplex network body ECU), Air conditioning amplifier assembly

      Maintains the current conditions.

      Nothing

      • U0073

      • U0100

      • U0142

      • U0155

      Manual Mirror Adjustment

      (Operates the left and right hand mirrors according to the mirror adjustment switch.)

      1. Outer mirror control ECU assembly LH, Outer mirror control ECU assembly RH

      2. Main body ECU (multiplex network body ECU)

      Manual mirror adjustment does not operate.

      Nothing

      U0142

      Electronically Retractable Mirrors

      (Automatic Mirror Retraction) (Retracts and returns the mirrors according to automatic mirror operation requests.)

      1. Outer mirror control ECU assembly LH, Outer mirror control ECU assembly RH

      2. Main body ECU (multiplex network body ECU)

      The electronically retractable mirrors do not operate.

      Nothing

      U0142

      Memorized Mirror Position Restoration

      (Memorizes and restores mirror position based on memory and restoration requests.)

      1. Outer mirror control ECU assembly LH, Outer mirror control ECU assembly RH

      2. Main body ECU (multiplex network body ECU)

      Memorization is not possible and the restoration function does not operate.

      Nothing

      -

      Mirror Heater

      (Stops and activates the mirror heater based on mirror heater request signals.)

      1. Outer mirror control ECU assembly LH, Outer mirror control ECU assembly RH

      2. Main body ECU (multiplex network body ECU), Air conditioning amplifier assembly

      The mirror heater does not operate.

      Nothing

      U0142

      Door Mirror Foot Light Illumination

      (Performs fade-in and fade-out control based on foot light illumination requests.)

      1. Outer mirror control ECU assembly LH, Outer mirror control ECU assembly RH

      2. Main body ECU (multiplex network body ECU), Air conditioning amplifier assembly

      Foot light illumination does not operate.

      Nothing

      -

      Memory Switch Signal Transmission

      (Transmits the states of switches via CAN communication.)

      1. Outer mirror control ECU assembly LH, Outer mirror control ECU assembly RH

      2. Main body ECU (multiplex network body ECU)

      Memorization is not possible and the restoration function does not operate.

      Nothing

      -

      AFS (Adaptive-front Lighting System)

      (Calculates the swivel angle and turning radius based on the wheel speeds and steering angle and controls the movement of the headlights.)

      1. Headlight swivel ECU assembly (AFS ECU)

      2. ECM, Master cylinder solenoid (skid control ECU), Spiral with sensor cable sub-assembly, Main body ECU (multiplex network body ECU)

      • Adaptive-front lighting system operation is normal.

      • The AFS OFF indicator light blinks.

      The AFS OFF indicator light blinks.

      • U0073

      • U0100

      • U0126

      • U0129

      • U0142

      Door Lock (Key-linked Function, Key Lock-in Prevention Function, etc.)

      (Performs lock/unlock control.)

      1. Main body ECU (multiplex network body ECU)

      2. ECM, Combination meter assembly, Center airbag sensor assembly

      The automatic lock operation is prohibited.

      Nothing

      • U0100

      • U0101

      • U0151

      • U0155

      Wireless/Entry & Start

      (Performs wireless/entry and start control.)

      1. Certification ECU

      2. Main body ECU (multiplex network body ECU)

      Entry and start/wireless control does not operate.

      Nothing

      U0327

      Alarm

      (Sounds various warnings.)

      1. Main body ECU (multiplex network body ECU)

      2. ECM, Power management control ECU

      -

      Nothing

      • U0100

      • U0101

      • U1133

      Lighting Control

      (Performs daytime running light and automatic high beam control.)

      1. Main body ECU (multiplex network body ECU)

      2. ECM, Headlight swivel ECU assembly (AFS ECU)

      Daytime running light control is not performed.

      Nothing

      • U0100

      • U0101

      • U0182

      Automatic Display Dimming

      (Performs display dimming.)

      1. Combination meter assembly

      2. -

      Dims the interior display/indicators.

      Nothing

      U0155

      Illumination

      (Performs illumination control.)

      1. Main body ECU (multiplex network body ECU)

      2. Certification ECU

      Turns off the map light.

      Nothing

      U0327

      Seat and Mirror Control

      (Performs memory control (seat, steering wheel and mirror position adjustment).)

      1. Main body ECU (multiplex network body ECU)

      2. Power management control ECU, Certification ECU, Front power seat switch LH, Multiplex tilt and telescopic ECU, Outer mirror control ECU assembly LH, Outer mirror ECU assembly RH

      -

      Nothing

      • U0199

      • U0200

      • U0208

      • U1115

      • U1002

      Seat Memory System

      (Controls the seat position according to the operating conditions.)

      1. Front power seat switch LH

      2. ECM, Combination meter assembly, Power management control ECU, Main body ECU (multiplex network body ECU), Multiplex tilt and telescopic ECU

      The power tilt and power telescopic steering column system and its memory and restore functions do not operate.

      Nothing

      -

      Pre-crash Safety System (Situation No.1)

      (Controls the seat belts and brakes during sudden braking or when the vehicle is uncontrollable.)

      1. Seat belt control ECU

      2. Master cylinder solenoid (skid control ECU), Center airbag sensor assembly

      Pre-crash safety system brake-linked control stops.

      The PCS indicator light blinks.

      • U0122

      • U0140

      • U0151

      Pre-crash Safety System (Situation No.2)

      (Controls the seat belts and brakes when a crash is unavoidable.)

      1. Seat belt control ECU

      2. Center airbag sensor assembly, Driving support ECU assembly

      Pre-crash safety millimeter wave radar sensor-linked control stops.

      The PCS indicator light turns on.

      • U0122

      • U0140

      • U0151

      • U1104

      ACC

      (Accelerates or decelerates the vehicle to maintain the distance to the vehicle ahead.)

      1. Driving support ECU assembly

      2. ECM, Master cylinder solenoid (skid control ECU), Spiral with sensor cable sub-assembly, Yaw rate sensor assembly, Combination meter assembly, Main body ECU (multiplex network body ECU)

      The ACC system does not operate.

      The radar cruise indicator light blinks and a message indicating system cancellation is displayed.

      • U0100

      • U0123

      • U0126

      • U0235

      • U1104

      Pre-crash Safety System

      (Controls the seat belts and brakes immediately before a crash.)

      1. Driving support ECU assembly

      2. Master cylinder solenoid (skid control ECU), Spiral with sensor cable sub-assembly, Yaw rate sensor assembly, Main body ECU (multiplex network body ECU)

      The pre-crash safety system does not operate.

      The PCS indicator light blinks and a buzzer sounds.

      • U0100

      • U0122

      • U0123

      • U0126

      • U1100

      • U1104

      Electrical Load Control

      (Performs idle up according to the electrical load.)

      1. ECM

      2. Main body ECU (multiplex network body ECU), Air conditioning amplifier assembly

      The idle speed changes.

      Nothing

      -

      Air Conditioning-linked Control

      (Performs idle up according to the compressor load.)

      1. ECM

      2. Power management control ECU, Air conditioning amplifier assembly

      Air conditioning-linked control does not operate.

      Nothing

      -

      Charging Control

      (Performs idle up according to charging requests.)

      1. Power management control ECU

      2. Power management control ECU

      Idle up according to the electrical load is not performed.

      Nothing

      -

      Eco Driving Indicator

      (Displays information to the driver to encourage "eco-driving".)

      1. ECM

      2. Combination meter assembly

      The display of all information stops.

      Nothing

      -

      Integrated Control (VSC)

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

      1. ECM

      2. Master cylinder solenoid (skid control ECU), Spiral with sensor cable sub-assembly, Yaw rate sensor assembly, Driving support ECU assembly

      Integrated control is not performed.

      Nothing

      -

      ECT System Indicators

      (Indicate the shift position, states of switches, system modes, etc.)

      1. ECM

      2. Driver support switch control ECU

      -

      The appropriate light does not turn on.

      -

      AI-SHIFT Control

      (Controls the A/T in order to improve engine braking power and acceleration feeling.)

      1. ECM

      2. Master cylinder solenoid (skid control ECU)

      AI-SHIFT control does not operate.

      Nothing

      -

      Coast Downshift

      (Changes the coast downshift point based on the air conditioning load and performs upshift delay according to air conditioning or heater requests.)

      1. ECM

      2. Air conditioning amplifier assembly

      Coast downshift shock becomes stronger.

      Nothing

      -

      Cruise Control

      (Adjusts the engine throttle valve opening amount automatically to maintain the vehicle speed.)

      1. ECM, Driving support ECU assembly

      2. ECM, Master cylinder solenoid (skid control ECU), Combination meter assembly, Driving support ECU assembly

      Cruise control does not operate.

      The radar cruise indicator light blinks.

      -

      TC DTC Output Service

      (Outputs a DTC in response to a DTC output request from the combination meter.)

      1. Combination meter assembly

      2. ECM

      The TC service function stops.

      Nothing

      -

      Event Data Recorder (EDR)

      (Records conditions such as the vehicle speed, the amount the accelerator pedal is depressed, and the shift lever position when the event data recorder recording conditions are met.)

      1. Center airbag sensor assembly

      2. ECM, Combination meter assembly

      -

      Nothing

      -

      SRS Warning Light Control

      (Turns the warning light on/off.)

      1. Combination meter assembly

      2. Center airbag sensor assembly

      The SRS warning light turns on.

      The SRS warning light turns on.

      -

      Collision Detection Signal (for Fuel-cut)

      (Notifies the system of a collision in order to perform fuel-cut when a vehicle collision occurs.)

      1. ECM

      2. Center airbag sensor assembly

      The fuel-cut function used when a collision occurs is stopped.

      Nothing

      -

      Seat Belt Warning Light Control

      (Turns the seat belt warning light on/off.)

      1. Combination meter assembly, Main body ECU (multiplex network body ECU)

      2. Center airbag sensor assembly

      The seat belt warning light does not operate.

      Nothing

      -

      Pre-crash Seat Belt Control

      (Controls the seat belts when a collision is determined to be unavoidable, during sudden braking or when the vehicle is uncontrollable.)

      1. Seat belt control ECU

      2. Master cylinder solenoid (skid control ECU), Center airbag sensor assembly, Driving support ECU assembly

      The pre-crash seat belts do not operate.

      The PCS indicator light blinks.

      • U0122

      • U0151

      • U1104

      Multi-function Switch

      (Operates the LEXUS parking assist switch, 2nd start switch and AFS-OFF switch using the steering switch.)

      1. Driving support switch control ECU

      2. Combination meter assembly, Headlight swivel ECU assembly (AFS ECU)

      -

      Nothing

      -

      Multi-terrain Select

      (Informs the user of the recommended vehicle state according to driving conditions.)

      1. Driving support switch control ECU

      2. ECM, Master cylinder solenoid (skid control ECU), Combination meter assembly

      • Mode switching is not possible.

      • The display of text messages in the meter display is not possible.

      A light turns on.

      -

      Parking Assist Monitor Switching

      (Changes the camera and image quality for the park assist monitor system.)

      1. Parking assist ECU

      2. Parking assist ECU

      • Camera switching is not possible.

      • Changing the brightness and contrast of the display is not possible.

      Nothing

      -

      Crawl Control Switch

      (Sends the crawl control switch information.)

      1. Master cylinder solenoid (skid control ECU)

      2. Master cylinder solenoid (skid control ECU)

      -

      Nothing

      -

      Push Start (Power Source Switching)

      (Changes the power source mode automatically based on the push start switch signal and commands the starter to operate when certain conditions are met.)

      1. Power management control ECU

      2. ECM, Combination meter assembly, Main body ECU (multiplex network body ECU)

      Does not display the necessary starting operation commands.

      Nothing

      U0100

      Charging Control

      (Changes the amount of voltage generated by the alternator according to the driving state of the vehicle and battery capacity.)

      1. Power management control ECU

      2. ECM

      The alternator switches to autonomous charging mode.

      Nothing

      -

      Engine Start Control

      (Prohibits and permits turning on the starter according to the vehicle state and start request signals.)

      1. Power management control ECU

      2. ECM

      Engine start control is performed through a direct line.

      Nothing

      U0100