CAN COMMUNICATION SYSTEM(for LHD) 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).

      System Function

      1. Control Master

      2. System Related

      3. Control Actuator

      		 Behavior during CAN Failure
      Vehicle Behavior Indicator and Buzzer Diagnostic Trouble Code
      SFI

      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, Power steering ECU assembly

      3. ECM

      		 Idle up according to the electrical load is not performed. The idling speed changes. -

      Air Conditioning-linked Control

      (Performs idle up according to the compressor load. Performs air conditioning cut control.)

      1. ECM

      2. Air conditioning amplifier assembly

      3. Air conditioning amplifier assembly

      		 Air conditioning-linked control does not operate (cannot perform idle up). Air conditioning does not operate. -

      PTC Heater

      (Performs idle up according to requests from the PTC heater [including coolant heater] or heater system.)

      1. ECM

      2. Air conditioning amplifier assembly

      3. ECM

      		 The PTC heater does not operate (permission is not granted).

        When there is a transmission stop or when the bus is continuously detected:

      • The PTC heater does not operate.


        When there is a reception stop:

      • The idling speed changes.

      • Heater performance becomes worse.

      • The PTC heater does not operate.

      		 -

      Eco-drive Indicator

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

      1. ECM

      2. -

      3. Combination meter assembly

      		 Nothing No information is displayed. -
      SFI

      Integrated Control

      (Estimates the driver requested torque based on the 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. Brake actuator assembly (skid control ECU), Power steering ECU assembly, Spiral with sensor cable sub-assembly (steering angle sensor)

      3. ECM

      		 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, drivability, acceleration performance and acceleration feeling are not improved. 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, drivability, acceleration performance and acceleration feeling are not improved. -

      ECT System Indicator

      (Displays shift, switch and mode information to the meter.)

      1. ECM

      2. Main body ECU (multiplex network body ECU)

      3. Combination meter assembly

      		 Nothing ECT system indicators do not illuminate. -

      Cruise Control

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

      1. ECM

      2. Brake actuator assembly (skid control ECU), Combination meter assembly

      3. ECM

      		 Nothing The cruise indicator blinks. -
      ECD

      Engine System Indicator Display

      (Estimates whether the oil has deteriorated and displays a request to change the oil.)

      1. ECM

      2. Combination meter assembly

      3. Combination meter assembly

      		 The meter display cannot be cleared.

        When there is a transmission stop or when the bus is continuously detected:

      • The system is unable to inform the user that the oil needs to be replaced.

      • The meter display does not clear.


        When there is a reception stop:

      • The meter display does not clear.

      		 -
      ECD

      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, Power steering ECU assembly

      3. ECM

      		 Idle up according to the electrical load is not performed. The idling speed changes. -

      Air Conditioning-linked Control

      (Performs idle up according to the compressor load. Performs air conditioning cut control.)

      1. ECM

      2. Air conditioning amplifier assembly

      3. Air conditioning amplifier assembly

      		 Air conditioning-linked control does not operate (cannot perform idle up). Air conditioning does not operate. -

      PTC Heater

      (Performs idle up according to requests from the PTC heater [including coolant heater] or heater system.)

      1. ECM

      2. Air conditioning amplifier assembly

      3. ECM

      		 The PTC heater does not operate (permission is not granted).

        When there is a transmission stop or when the bus is continuously detected:

      • The PTC heater does not operate.


        When there is a reception stop:

      • The idling speed changes.

      • Heater performance becomes worse.

      • The PTC heater does not operate.

      		 -

      ECT System Indicator

      (Displays shift, switch and mode information to the meter.)

      1. ECM

      2. Main body ECU (multiplex network body ECU)

      3. Combination meter assembly

      		 Nothing ECT system indicators do not illuminate. -

      Coast Downshift, Heater Requested Upshift Delay

      (Changes the coast downshift point based on the air conditioning load. Performs heater requested upshift delay.)

      1. ECM

      2. Air conditioning amplifier assembly

      3. ECM

      		 Coast downshift does not operate. Coast downshift shock becomes stronger. -
      ECD

      Cruise Control

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

      1. ECM

      2. Brake actuator assembly (skid control ECU), Combination meter assembly

      3. ECM

      		 Nothing The cruise indicator blinks. -

      Eco Driving Indicator

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

      1. ECM

      2. -

      3. Combination meter assembly

      		 Nothing No information is displayed. -

      Integrated Control

      (Estimates the driver requested torque based on the 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. Brake actuator assembly (skid control ECU), Power steering ECU assembly, Spiral with sensor cable sub-assembly (steering angle sensor)

      3. ECM

      		 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, drivability, acceleration performance and acceleration feeling are not improved. 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, drivability, acceleration performance and acceleration feeling are not improved. -

      Eco-run Control

      (Performs engine starting and stopping using eco-run control.)

      1. ECM

      2. Engine stop and start ECU

      3. Engine stop and start ECU

      		 Eco-run control is prohibited. Eco-run control is prohibited. U1103
      Air Conditioning

      Air Conditioner


      • The idle up engine speed, etc. is calibrated.

      • Adjusts the air temperature, airflow mode and airflow volume according to the engine coolant temperature.

      • Engine coolant temperature map calibration and compressor judgment value switching based on engine type.

      1. Air conditioning amplifier assembly

      2. ECM

      3. -

      • When there is a communication stop from the first time the ignition switch is turned to ON: Control is performed with the coolant temperature data set at the default value (80°C [176°F]).

      • When there is a communication stop while the ignition switch is ON: Maintains previous values.

      • When the ignition switch is not ON: Nothing

      		 If a communication stop occurs while the engine coolant temperature is rising, the airflow amount does not rise due to warm up control. -

      • When there is a communication stop from the first time +B is On and there is no DTF data: Control is performed with the engine type set at the default value.

      • When there is a communication stop in a situation other than described above: Maintains previous values.

      • When the ignition switch is not ON: Nothing

      		 When the AUTO SW is depressed, the compressor does not turn ON, or the compressor turns ON when it should not. U0100

      Compressor Control

      (Determines whether the compressor is locked according to NE.)

      1. Air conditioning amplifier assembly

      2. ECM

      3. -

      • When the ignition switch is ON: Control is performed with the default value (0 rpm).

      • When the ignition switch is not ON: Nothing

      		 The number of lines that turn ON by the PTC relay does not increase. -
      Air Conditioning

      Simple Load Control

      (Limits simple electrical load control according to the load control level.)

      1. Air conditioning amplifier assembly

      2. Power steering ECU assembly

      3. -

      • When the ignition switch is ON: Maintains previous values (there is no load control during a reset).

      • When the ignition switch is not ON: Nothing

      		 The DEF relay and PTC relay do not turn ON. U0131

      Destination Determination Control

      (Switches air conditioning control pattern according to destination information.)

      1. Air conditioning amplifier assembly

      2. Main body ECU (multiplex network body ECU)

      3. -

      • When the ignition switch is ON: Maintains previous values.

      • When the ignition switch is not ON: Nothing

      		 The set temperature, unit, and central value on the panel cannot be changed. U0142

      Outside Temperature Compensation Control

      (Changes the air conditioning system operation state and adjusts the outside temperature display value according to the vehicle information.)

      1. Air conditioning amplifier assembly

      2. Combination meter assembly

      3. -

      • When the ignition switch is ON: Control is performed with the vehicle speed set at the default value (0 km/h [0 mph]).

      • When the ignition switch is not ON: Nothing

      • When the ignition switch is ON:


        • The reliability of the outside temperature value shown decreases.

        • The system is not able to adjust the air conditioning airflow volume correctly.

      • When the ignition switch is not ON: Nothing

      		 U0155
      Main Body

      Door Lock

      (Operates the lock and unlock [the key-linked function, key lock-in prevention function, automatic lock function, etc.].)

      1. Main body ECU (multiplex network body ECU)

      2. ECM, Combination meter assembly Airbag sensor assembly

      3. Main body ECU (multiplex network body ECU)

        When there is a reception stop (ECM):

      • The speed-sensitive automatic door lock operation is prohibited.

      • The shift-linked automatic door lock operation is prohibited.

      • The shift-linked automatic door unlock operation is prohibited.

      • Automatic door lock switching is prohibited.


        When there is a reception stop (combination meter assembly):

      • The speed-sensitive automatic door lock operation is prohibited.


        When there is a reception stop (airbag sensor assembly):

      • When the ignition switch is ON: Maintains previous values.

      • When the ignition switch is off: The key-linked operation is permitted.

      		 Nothing

      • U0100

      • U0101

      • U0151

      • U0155

      Alarm

      (Sounds various warnings.)

      1. Main body ECU (multiplex network body ECU)

      2. ECM, Multiplex network door ECU

      3. Main body ECU (multiplex network body ECU)

      		 Nothing Nothing

      • U0100

      • U0230
      Main Body

      Automatic Dimming of Display

      (Controls the display dimming.)

      1. Main body ECU (multiplex network body ECU)

      2. Combination meter assembly

      3. Main body ECU (multiplex network body ECU)

      		 Automatically performs display dimming control when tail mode is not canceled (when the light sensor illuminance signal value is less than the display dimming value, the interior displays and indicators are dimmed). Nothing U0155

      Illumination

      (Performs illumination control.)

      1. Main body ECU (multiplex network body ECU)

      2. ECM, Certification ECU (smart key ECU assembly)

      3. Main body ECU (multiplex network body ECU)

      • The dome light is turned off.

      • The door mirror foot light is turned off.

      • The foot light is turned off.

      		 The dome light does not turn off immediately after exiting the vehicle.

      • U0101

      • U0327

      Seat Control

      (Memory control [seat position adjustment])

      1. Main body ECU (multiplex network body ECU)

      2. Combination meter assembly, Certification ECU (smart key ECU assembly), Position control ECU and switch assembly

      3. Position control ECU and switch assembly

      • Commands seat operation to be stopped.

      • When recording the memory call, the operation stops due to a time out when waiting for the verification results.

      		 Nothing

      • U0208

      • U0327

      Entry/Wireless

      (Entry/wireless control)

      1. Certification ECU (smart key ECU assembly)

      2. Main body ECU (multiplex network body ECU)

      3. Certification ECU (smart key ECU assembly)

      		 Entry lock/unlock control not possible. Nothing U0327

      Lighting Control

      (Performs DRL control)

      1. Main body ECU (multiplex network body ECU)

      2. ECM

      3. Main body ECU (multiplex network body ECU)

      		 Daytime running light control is not performed. Nothing U0100
      Main Body

      Back Door Opener

      (Performs back door opener control and power back door one motion open control)

      1. Main body ECU (multiplex network body ECU)

      2. Combination meter assembly, Multiplex network door ECU

      3. Main body ECU (multiplex network body ECU)

      • Back door opener control is prohibited.

      • The back door operation start answer back (hazard warning light/buzzer) does not operate.

      • The one motion power back door does not operate.

      		 Nothing

      • U0155

      • U0230
      Navigation System

      Eco Navigation Display

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

      1. Radio and display receiver assembly, Navigation receiver assembly, Navigation ECU sub-assembly

      2. ECM, Combination meter assembly, Brake actuator assembly (skid control ECU)

      3. -

      • The fuel consumption per minute display update on the eco navigation screen (fuel consumption per minute screen) stops (the fuel consumption per minute history graph is not cleared).

      • Stops updating the average fuel consumption history on the eco navigation (eco drive screen).

      • If the distance to empty is being displayed on the eco navigation (eco drive screen), the value displayed is cleared due to a distance to empty data communication stop.

      • The 1 minute fuel consumption graph on the eco navigation (eco drive) display is not updated for 1 minute or more.

      • The most recent value for the fuel consumption interval graph on the eco navigation (eco drive) screen is cleared.

      • The numbers of the distance to empty displayed on the fuel consumption screen of the eco navigation (eco drive) display are cleared.

      • U0100

      • U0129

      • U0155
      Navigation System

      Rear View Monitor Control

      (Displays the rear view monitor based on information from the steering sensor, the vehicle speed, and the vehicle information [2WD/4WD determination information, etc.].)

      1. Radio and display receiver assembly, Navigation receiver assembly, Navigation ECU sub-assembly

      2. Main body ECU (multiplex network body ECU), Spiral with sensor cable sub-assembly (steering angle sensor), ECM, Power steering ECU assembly, Brake actuator assembly (skid control ECU)

      3. -

      • If a communication stop occurs when the expected course lines are being displayed, the expected course lines are cleared and "Guidance unavailable" is displayed on the bottom of the screen.

      • If a communication stop occurs when the display is in parallel parking guide mode, "Guidance unavailable" is displayed on the bottom of the screen.

      • If a communication stop occurs while the expected course lines are displayed, the expected course lines are cleared and "Guidance unavailable" is shown at the bottom of the screen.

      • If a communication stop occurs when the display is in parallel parking guide mode, "Guidance unavailable" is displayed on the bottom of the screen.

      • The screen does not change to the camera screen.

      • When the shift lever is moved to R and the camera screen is being displayed, a place other than the rear of the vehicle is displayed.

      • U0100

      • U0126

      • U0129

      • U0131

      • U0140

      Destination Determination

      (Determines the destination of the vehicle and selects the display language, time zone, etc. based on destination symbols, destination package information, etc.)

      1. Radio and display receiver assembly, Navigation receiver assembly, Navigation ECU sub-assembly

      2. Main body ECU (multiplex network body ECU)

      3. -

      		 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). The time zone and language selection screens do not match the destination. U0140
      Navigation System

      Vehicle Diagnosis Recorder

      (Continuously records the status information from the control ECU and sensor information to the HDD in the EMV [AVN].)

      1. Navigation receiver assembly, Navigation ECU sub-assembly

      2. ECM, Brake actuator assembly (skid control ECU), Power steering ECU assembly, Combination meter assembly, Airbag sensor assembly, Main body ECU (multiplex network body ECU), Air conditioning amplifier assembly

      3. -

      		 Records last received value to HDD every 500 milliseconds. Nothing -

      Time Stamp Function

      (Matches the relative time from the main body ECU with the absolute time acquired from the GPS.)

      1. Main body ECU (multiplex network body ECU)

      2. Main body ECU (multiplex network body ECU)

      3. -

      		 Nothing Nothing

      • U0073

      • U0140
      EPS

      Electronic Power Steering System

      (Calculates the current to be used for the steering assist according to the torque sensor value and vehicle speed, and then operates the motor.)

      1. Power steering ECU assembly

      2. ECM, Brake actuator assembly (skid control ECU), Spiral with sensor cable sub-assembly (steering angle sensor)

      3. -

      • Power steering system does not operate.

      • Temporarily controls the vehicle with the assist amount fixed as if the vehicle were being driven at 100 km/h (62 mph).

      • The steering feel becomes worse (compensation control using the steering angle is stopped).

      		 The EPS warning light illuminates.

      • U0100

      • U0129

      Simple Load Control

      (Determines the current power supply and load status, and sends commands to limit control.)

      1. Power steering ECU assembly

      2. Power steering ECU assembly

      3. Air conditioning amplifier assembly

      		 Nothing Nothing -

      αB Control

      (Performs assist to prevent sliding sideways.)

      1. Brake actuator assembly (skid control ECU)

      2. Brake actuator assembly (skid control ECU)

      3. Power steering ECU assembly

      		 Control finishes if the CAN communication data becomes invalid during αB control. The EPS warning light illuminates. U0129
      EPS

      Steering Assist Calculation

      (Changes the assist force according to the vehicle speed.)

      1. Power steering ECU assembly

      2. Brake actuator assembly (skid control ECU)

      3. -

      • As the vehicle speed cannot be determined, control continues with the vehicle speed set at 100 km/h (62 mph).

      • The steering wheel feels heavy when the vehicle speed is below 100 km/h (62 mph) and light when the vehicle speed exceeds 100 km/h (62 mph).

      		 The EPS warning light illuminates. U0129

      DTC Output

      (When the TC signal is on, DTC information is sent according to the polling from meter ECU.)

      1. Combination meter assembly

      2. ECM, Power steering ECU assembly

      3. -

      		 Nothing Nothing -

      Assist Map Selection

      (Selects the assist map according to the destination information, drivetrain [2WD or 4WD], engine type, etc.)

      1. Power steering ECU assembly

      2. ECM, Brake actuator assembly (skid control ECU)

      3. -

      • A temporary map is used to perform assist as an assist map cannot be selected according to vehicle specifications.

      • Steering feel may be unusual.

      • The frame used to select the assist map may change depending on the vehicle.

      		 There is no indication of a communication problem. However, the EPS warning light illuminates because an assist map is not selected. -

      Idle Up

      (When a large assist current is created, request idle up to the ECM in order to prevent the battery voltage from dropping.)

      1. ECM

      2. Power steering ECU assembly

      3. -

      		 Nothing Nothing -

      Warning Light Illumination

      (When a fail-safe occurs, requests the meter ECU to illuminate the EPS warning light.)

      1. Combination meter assembly

      2. Power steering ECU assembly

      3. -

      		 Nothing Nothing -
      EPS

      Compensation Control

      (Performs assist according to the vehicle speed for various compensation controls.)

      1. Power steering ECU assembly

      2. Brake actuator assembly (skid control ECU)

      3. -

      		 When a CAN malfunction (vehicle speed malfunction) occurs, all controls operate as if the vehicle is being driven at 100 km/h (62 mph). The EPS warning light illuminates. U0129
      Stops air conditioning operation in order to decrease battery power consumption when the battery voltage decreases.

      1. Power steering ECU assembly

      2. -

      3. Air conditioning amplifier assembly

      		 Nothing Nothing -
      Eco Run

      Stop and Start System

      (Stops the engine when the vehicle is stopped.)

      1. Engine stop and start ECU

      2. ECM, Brake actuator assembly (skid control ECU), Main body ECU (multiplex network body ECU), Power steering ECU assembly, Air conditioning amplifier assembly, Airbag sensor assembly, Combination meter assembly

      3. ECM

      • During eco-run: Restarts

      • Not during eco-run: Prohibits eco-run

      		 ECO driving indicator light blinks.

      • U0100

      • U0121

      • U0131

      • U0140

      • U0151

      • U0155

      • U0164
      Seat

      Microcomputer Preset Position System

      (Controls the memorized seat position according to vehicle information [power source mode, shift position, door, vehicle speed] and switch information [memory switch].)

      1. Position control ECU and switch assembly

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

      3. -

      • The memory system does not operate.

      • The memory call function does not operate.

      • The return away function does not operate.

      • The memory system does not operate.

      • The memory call function does not operate.

      • The return away function does not operate.

      		 -
      Blind Spot Monitor

      Blind Spot Monitor

      (Warns the driver when the system detects a vehicle in the blind spots of the outer mirrors.)

      1. Blind spot monitor sensor LH/RH

      2. ECM, Brake actuator assembly (skid control ECU), Main body ECU (multiplex network body ECU), Air conditioning amplifier assembly, Blind spot monitor sensor LH/RH

      3. Blind spot monitor sensor LH/RH

      		 Maintains previous values. Blind spot monitor system warning displayed.

      • U0100

      • U0126

      • U0129

      • U0140

      • U0232*
      Steering Angle Sensor

      Steering Sensor

      (Detects steering wheel angle)

      1. Spiral with sensor cable sub-assembly (steering angle sensor)

      2. Brake actuator assembly (skid control ECU)

      3. -

      		 Sends steering sensor data information every 12 seconds. Nothing -
      Power Back Door

      Power Back Door Open/Close Function


      • Automatically opens the back door according to the operation conditions (power source mode, shift position, vehicle speed, lock position) and switch operation (driver seat/wireless).

      • Automatically closes the back door according to switch operation (driver seat/wireless/back door).

      1. Multiplex network door ECU

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

      3. -

      • Does not perform the automatic open and close operation.

      • The function cannot reverse operation during the automatic operation.

      • There is no answer back with the buzzer or hazard warning lights when the automatic back door operation starts.

      • Does not perform the automatic open and close operation.

      • The wireless one motion function does not operate.

      • Stopping the automatic open or closing operation is not possible.

      • The function cannot reverse operation during the closer operation.

      		 -
      Power Back Door

      Wireless One Motion Function

      (If a wireless switch operation is performed with the doors locked, the back door is automatically opened.)

      1. Multiplex network door ECU

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

      3. -

      		 The wireless one motion function does not operate. The wireless one motion function does not operate. -

      Back Door Opener Function

      (Opens the back door according to operation conditions [power source mode, vehicle speed, lock position] and the back door handle switch.)

      1. Multiplex network door ECU

      2. Main body ECU (multiplex network body ECU), Combination meter assembly, Certification ECU (smart key ECU assembly)

      3. -

      		 The back door opener does not operate. The back door opener does not operate. -

      Back Door Closer Function

      (Completely closes the back door when it is ajar.)

      1. Multiplex network door ECU

      2. Main body ECU (multiplex network body ECU), Combination meter assembly, Certification ECU (smart key ECU assembly)

      3. -

      		 The function cannot reverse operation during the closer operation. The function cannot reverse operation during the closer operation. -

      Courtesy Switch Signal Substitution Output Function

      (Sends a back door courtesy switch signal through the CAN bus.)

      1. Multiplex network door ECU

      2. Main body ECU (multiplex network body ECU)

      3. -

      		 Nothing When the back door opens, the indicator in the meter indicating the door is open does not illuminate -

      Lock Permission Signal Output Function during Power Back Door Closing Operation

      (Sends a power back door closing operation signal to the CAN bus in order to allow a wireless door lock during the power back door closing operation.)

      1. Multiplex network door ECU

      2. Main body ECU (multiplex network body ECU), Certification ECU (smart key ECU assembly)

      3. -

      		 Nothing Disallows the wireless lock during the power back door closing operation. -
      Lane Departure Alert

      LDW

      (Warning when vehicle deviates from the lane.)

      1. Lane departure warning camera

      2. ECM, Brake actuator assembly (skid control ECU), Main body ECU (multiplex network body ECU), Combination meter assembly, Airbag sensor assembly

      3. Brake actuator assembly (skid control ECU)

      		 Stops detection and the buzzer output stops immediately. A malfunction message is displayed.

      • U0101

      • U0123

      • U0129

      • U0142

      • U0155
      4WD

      ATC-4WD System

      (Controls the driving force distribution between the front and rear wheels according to driving conditions.)

      1. 4WD ECU assembly

      2. ECM, Brake actuator assembly (skid control ECU), Main body ECU (multiplex network body ECU), Spiral with sensor cable sub-assembly (steering angle sensor), Air conditioning amplifier assembly

      3. 4WD ECU assembly

        When transmission is lost:

      • 4WD control is prohibited (the vehicle behaves the same as a 2WD vehicle).


        When there is a reception stop:

      • When the ECM or steering angle sensor is malfunctioning: Control continues using default values.

      • When the skid control ECU is malfunctioning:


        • Control is prohibited (the vehicle behaves the same as a 2WD vehicle).

        • Yaw rate feedback control is prohibited (conventional control continues).

        When there is a transmission stop or when the bus is continuously detected:

      • 4WD indicator light blinks.


        When there is a reception stop or a cyclic malfunction:

      • 4WD indicator light illuminates.

      • U0073

      • U0100

      • U0126

      • U0129
      4WD

      ATC-4WD System

      (Controls the driving force distribution between the front and rear wheels according to driving conditions.)

      1. 4WD ECU assembly

      2. ECM, Brake actuator assembly (skid control ECU), Main body ECU (multiplex network body ECU), Spiral with sensor cable sub-assembly (steering angle sensor), Air conditioning amplifier assembly

      3. 4WD ECU assembly

        During a cyclic malfunction:

      • During a steering angle sensor malfunction:


        • Control continues by maintaining previous values.

        • Control continues using default values.

      • During an ECM malfunction: Control continues using default values.

      • When the skid control ECU is malfunctioning:


        • Control continues using the default values (yaw rate feedback control).

        • Control continues, but the feedback of the speed difference between the front and rear wheels is prohibited.

      • When the air conditioning amplifier assembly or main body ECU is malfunctioning: Control continues using default values.

        When there is a transmission stop or when the bus is continuously detected:

      • 4WD indicator light blinks.


        When there is a reception stop or a cyclic malfunction:

      • 4WD indicator light illuminates.

      • U0073

      • U0100

      • U0126

      • U0129
      4WD

      ATC-4WD System

      (Controls the driving force distribution between the front and rear wheels according to driving conditions.)

      1. 4WD ECU assembly

      2. ECM, Brake actuator assembly (skid control ECU), Main body ECU (multiplex network body ECU), Spiral with sensor cable sub-assembly (steering angle sensor), Air conditioning amplifier assembly

      3. 4WD ECU assembly

        When a continuous bus is detected:

      • Control is prohibited (the vehicle behaves the same as a 2WD vehicle).

        When there is a transmission stop or when the bus is continuously detected:

      • 4WD indicator light blinks.

      • U0073

      • U0100

      • U0126

      • U0129
      Meter

      Vehicle Speed Display

      (Operates the speedometer according the vehicle speed signals from the skid control ECU.)

      1. Combination meter assembly

      2. Brake actuator assembly (skid control ECU)

      3. -

      		 Signal is considered to be "0".

      • Displays 0 km/h (0 mph) in the speedometer.

      • The drive monitor stops calculating.

      		 U0129

      Tachometer

      (Displays the tachometer.)

      1. Combination meter assembly

      2. ECM

      3. -

      		 Signal is considered to be "0".

      • Displays 0 rpm in the tachometer.

      • The drive monitor stops calculating.

      		 U0100

      Airbag

      (Turns the airbag warning light on and off.)

      1. Combination meter assembly

      2. Airbag sensor assembly

      3. -

      		 Signal is considered to be "Active". The airbag warning light illuminates. U0151

      EPS Warning Light

      (Turns the EPS warning light on and off.)

      1. Combination meter assembly

      2. Power steering ECU assembly

      3. -

      		 Signal is considered to be "Active". The EPS warning light illuminates. U0131

      SLIP Indicator Light

      (Turns the SLIP indicator light on and off.)

      1. Combination meter assembly

      2. Brake actuator assembly (skid control ECU)

      3. -

      		 Signal is considered to be "Active". The SLIP indicator illuminates. -

      ECT/ENG System Display

      (Displays the coolant temperature.)

      1. Combination meter assembly

      2. ECM

      3. -

      		 Signal is considered to be "0". The needle of the engine coolant temperature gauge is at the C mark or below. -
      Brake

      Anti-lock Brake System Control

      (Prevents the wheels from locking when suddenly stopping.)

      1. Brake actuator assembly (skid control ECU)

      2. -

      3. Brake actuator assembly (skid control ECU)

      • During control: After ending backup control (which stabilizes the vehicle), the system changes to normal braking and prohibits this control.

      • Not during control: Control cannot begin.

      • The brake warning light illuminates.

      • The ABS warning light illuminates.

      • The SLIP indicator illuminates.

      		 U0073
      Brake

      Vehicle Stability Control/Traction Control/Vehicle Dynamics Integrated Management Control

      (Suppresses vehicle instability, such as drift when cornering and wheel slippage when accelerating. During vehicle dynamics integrated management control, vehicle integrated control which includes electronic steering control is performed.)

      1. Brake actuator assembly (skid control ECU)

      2. ECM, Power steering ECU assembly, Spiral with sensor cable sub-assembly (steering angle sensor)

      3. Brake actuator assembly (skid control ECU)

      • During control: After ending backup control (which stabilizes the vehicle), the system changes to normal braking and prohibits this control.

      • Not during control: Control cannot begin.

      • The brake warning light illuminates.

      • The ABS warning light illuminates.

      • The SLIP indicator illuminates.

      • U0073

      • U0100

      • U0126

      Hill-start Assist Control 2

      (Maintains the brake fluid pressure for 2 seconds when the brake pedal is depressed further.)

      1. Brake actuator assembly (skid control ECU)

      2. ECM, Spiral with sensor cable sub-assembly (steering angle sensor)

      3. Brake actuator assembly (skid control ECU)

      • During control: After ending backup control (which stabilizes the vehicle), the system changes to normal braking and prohibits this control.

      • Not during control: Control cannot begin.

      • The brake warning light illuminates.

      • The ABS warning light illuminates.

      • The SLIP indicator illuminates.

      • U0073

      • U0100

      • U0126

      Eco Run Hold Control

      (Maintains brake fluid pressure while switching from the brake pedal to the accelerator pedal and restarting the engine. The fluid pressure is maintained for a maximum of 2 seconds. Afterwards, it takes 1 second for the pressure to be released.)

      1. Brake actuator assembly (skid control ECU)

      2. ECM, Spiral with sensor cable sub-assembly (steering angle sensor), Engine stop and start ECU

      3. Brake actuator assembly (skid control ECU)

      • During control: After ending backup control (which stabilizes the vehicle), the system changes to normal braking and prohibits this control.

      • Not during control: Control cannot begin.

      • The brake warning light illuminates.

      • The ABS warning light illuminates.

      • The SLIP indicator illuminates.

      • U0073

      • U0100

      • U0126
      Entry and Start

      Entry and Start Function


      • Entry lock/unlock and entry back door unlatch

      • Entry warning

      • Entry illumination (Dome light illumination, etc.)

      1. Main body ECU (multiplex network body ECU), Certification ECU (smart key ECU assembly)

      2. Main body ECU (multiplex network body ECU), Certification ECU (smart key ECU assembly)

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

      		 An entry unlock retry is performed.

      • Entry lock/unlock and entry back door unlatch

      • Entry warning does not operate.

      • Entry illumination does not operate.

      • The answer back function continuously operates when an unlock operation is performed.

      • U0142

      • U0155

      1. Certification ECU (smart key ECU assembly)

      2. Engine stop and start ECU

      3. Combination meter assembly

      		 Nothing Nothing U1103

      1. Certification ECU (smart key ECU assembly)

      2. ECM

      3. Combination meter assembly

      		 The previous value is maintained. Falsely outputs the entry warning. U0100

      Wireless Function

      (Operates the wireless lock/unlock functions, etc.)

      1. Main body ECU (multiplex network body ECU)

      2. Main body ECU (multiplex network body ECU), Certification ECU (smart key ECU assembly)

      3. Main body ECU (multiplex network body ECU)

      		 Nothing Wireless lock/unlock and trunk functions do not operate. -
      Entry and Start

      Memory Function

      (Moves the seat to the memorized position when the doors are unlocked using the entry or wireless unlock.)

      1. Main body ECU (multiplex network body ECU)

      2. Main body ECU (multiplex network body ECU), Certification ECU (smart key ECU assembly)

      3. Position control ECU and switch assembly

      		 Nothing The memory recall function does not operate. U0142

      Ignition Switch Illumination Control

      (Operates ignition switch illumination in conjunction with the dome light illumination, etc.)

      1. Certification ECU (smart key ECU assembly)

      2. Main body ECU (multiplex network body ECU), Certification ECU (smart key ECU assembly), Combination meter assembly

      3. Certification ECU (smart key ECU assembly)

      • When the ignition switch letters are illuminated due to the dome light, the illumination turns off.

      • When the DC cut fuse is removed and the ignition switch letters are illuminated due to the panel illumination, the illumination turns off.

      • The previous value is maintained.

      • If the ignition switch letters are not illuminated, they never illuminate.

      • If the ignition switch letters are illuminated due to the panel illumination, the illumination does not turn off.

      • When the ignition switch letters are illuminated due to the dome light, the illumination does not turn off.

      • When the DC cut fuse is removed and the ignition switch letters are illuminated due to the panel illumination, the illumination turns off.

      		 U0142
      Airbag

      TC DTC Output Service

      (While TC = ON is being received from the engine, a DTC is output in response to the request from the combination meter assembly.)

      1. Combination meter assembly

      2. ECM, Multiplex network door ECU

      3. Airbag sensor assembly

      		 If the TC signal is lost during TC service (TC=ON), the TC is determined to be OFF and TC service ends. Nothing -
      Airbag

      Timestamp

      (Records DTCs and timestamps received from the main body ECU.)

      1. Airbag sensor assembly

      2. Main body ECU (multiplex network body ECU)

      3. -

      		 Changes to a separate count inside the ECU and sets separate count recognition information when it receives a fail value or communication stops. Nothing -

      Collision Detection Signal

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

      1. ECM

      2. Airbag sensor assembly

      3. -

      		 Nothing Nothing -

      Airbag Warning Light Control

      (Sends airbag warning light illumination information.)

      1. Combination meter assembly

      2. Airbag sensor assembly

      3. -

      		 Nothing Nothing -

      Seat Belt Warning Control

      (Sends information about the passengers in order to turn the seat belt warning on and off.)

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

      2. Airbag sensor assembly

      3. -

      		 Nothing Nothing -

      Trigger Signal/Autonomous Transmission

      (Outputs the yaw rate and acceleration sensor signal.)

      1. Airbag sensor assembly

      2. Brake actuator assembly (skid control ECU)

      3. Brake actuator assembly (skid control ECU)

      		 Sends yaw rate sensor data information. Nothing -

      Event Data Recorder (EDR)

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

      1. Airbag sensor assembly

      2. ECM, Brake actuator assembly (skid control ECU), Spiral with sensor cable sub-assembly (steering angle sensor)

      3. -

      • When there is a communication error, a failure notification is received from the other device, or an invalid value is recorded in the EDR when the communication failure occurs.

      • When there is a periodic problem, the previous value is maintained.

      		 Nothing -
      Airbag

      Drive Data Recorder (DDR)

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

      1. Airbag sensor assembly

      2. ECM, Brake actuator assembly (skid control ECU), Main body ECU (multiplex network body ECU), Combination meter assembly, Power steering ECU assembly, Spiral with sensor cable sub-assembly (steering angle sensor)

      3. -

      • When there is a communication error, a failure notification is received from the other device, or an invalid value is recorded in the DDR when the communication failure occurs.

      • When there is a periodic problem, the previous value is maintained.

      		 Nothing -
      Parking Assist Monitor

      Rear view monitor

      (System that monitors the shift position signal, steering angle signal and vehicle speed signal and displays the estimated course lines in accordance with the steering angle amount when the vehicle is being driven in reverse)

      1. Television camera assembly

      2. Main body ECU (multiplex network body ECU), Spiral with sensor cable sub-assembly (steering angle sensor), Radio and display receiver assembly, Navigation receiver assembly

      3. -

      • When a transmission stop is detected: The rear view monitor functions do not operate (the estimated course lines are not displayed).

      • When a reception stop with the steering angle sensor or a continuous bus off condition is detected: The estimated course lines are not displayed.

      • When a reception stop with the radio and display receiver assembly or navigation receiver assembly is detected:


        • The previous value is used to determine whether or not there is a parking assist monitor function.

        • The previous value is used to determine the guideline display mode.

      • A reception stop with the steering angle sensor or a continuous bus off condition is detected during a transmission stop: The estimated course lines are not displayed.

      • When a reception stop with the radio and display receiver assembly or navigation receiver assembly is detected: Nothing

      • U0126

      • U0140

      • U0163
      Parking Assist Monitor

      Rear view monitor

      (System that monitors the shift position signal, steering angle signal and vehicle speed signal and displays the estimated course lines in accordance with the steering angle amount when the vehicle is being driven in reverse)

      1. Television camera assembly

      2. Main body ECU (multiplex network body ECU), Spiral with sensor cable sub-assembly (steering angle sensor), Radio and display receiver assembly, Navigation receiver assembly

      3. -

      • When a reception stop with the main body ECU is detected:


        • The rear view monitor functions do not operate.

        • The parking assist-sensor-linked display functions do not operate.

        • Communication is lost or a periodic malfunction determination is not performed for the ignition switch ON reception frame.

        • "CHK" is displayed on the vehicle signal confirmation screen.

        • A courtesy warning screen is displayed during television camera assembly beam axis adjustment.

        • Time stamp function (individual count identification information setting) does not operate.

      • When a reception stop with the main body ECU is detected:


        • No guidelines are displayed.

        • The parking assist-sensor monitor icon is not displayed.

      • U0126

      • U0140

      • U0163

      *: There is only output from the blind spot monitor sensor LH.