CAN COMMUNICATION SYSTEM(w/ Central Gateway ECU) 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


      • Coolant temperature correction control.

      • Engine operation control.

      • Electric water pump control.

      • PTC control.

      Air conditioning amplifier assembly ECM
      • Coolant temperature information: Control is performed based on the value detected before the malfunction or based on a default coolant temperature of 80°C (176°F).

      • PTC control: PTC mode is turned off due to a sensor malfunction.

      - -

      Air Conditioning Control


      • Inverter control.

      • Electric water pump control.

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

      [Air conditioning amplifier assembly]

      U0100

      Air Conditioning Control


      • Electric load control state is controlled based on load control level signal.

      Air conditioning amplifier assembly Power steering ECU assembly No load control (regular control). -

      [Air conditioning amplifier assembly]

      U0131

      Air Conditioning Control


      • ECO mode judgment control.

      Air conditioning amplifier assembly Hybrid vehicle control ECU Maintains same condition (Controls using default value (ECO display off) when not determined). - -

      Air Conditioning Control


      • A/C control mode switching.

      • HVAC control switching.

      • Indicator dimming control.

      Air conditioning amplifier assembly Main body ECU (multiplex network body ECU) Maintains same condition (Controls using default value when not determined). -

      [Air conditioning amplifier assembly]

      U0142

      Air Conditioning Control


      • Vehicle speed correction control.

      Air conditioning amplifier assembly Combination meter sub-assembly
      • Control is performed based on default vehicle speed of 0 km/h.

      • Correction level for displayed ambient temperature declines.

      • Correction level for outlet airflow declines.

      -

      [Air conditioning amplifier assembly]

      U0155

      Air Conditioning Control


      • READY signal control.

      Air conditioning amplifier assembly Hybrid vehicle control ECU Maintains the same state. (When not determined, control is performed based on a default setting of off.) -

      [Air conditioning amplifier assembly]

      U0293

      Air Conditioning Control


      • Sends a signal from the air conditioning amplifier assembly to the hybrid vehicle control ECU and from the hybrid vehicle control ECU to the inverter for the air conditioning system.

      Air conditioning amplifier assembly Hybrid vehicle control ECU Air conditioning cooling operation is stopped. -

      [Hybrid vehicle control ECU]

      U0164

      ECO Navigation Display


      • Displays fuel consumption per minute and regeneration amount in chart and displays history of average fuel economy.


      • Navigation receiver assembly

      • Radio and display receiver assembly


      • Brake booster with master cylinder assembly (skid control ECU)

      • Combination meter sub-assembly

      • Hybrid vehicle control ECU

      • ECM


      • Update of the per-minute fuel consumption display (per minute fuel consumption calculation) on the navigation Eco screen (per-minute fuel consumption screen) is stopped.

      • Update of the current average fuel economy display on the navigation Eco screen (block fuel consumption screen) is stopped.

      • If drivable mileage is displayed on the navigation Eco screen (block fuel consumption screen), the numeric part of the drivable mileage disappears because drivable mileage data cannot be received.

      -

      [Navigation receiver assembly]

      U0100

      U0129

      U0155

      U0293

      [Radio and display receiver assembly]

      U0100

      U0129

      U0155

      U0293

      Energy Monitor Display


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


      • Navigation receiver assembly

      • Radio and display receiver assembly

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

      [Navigation receiver assembly]

      U0293

      [Radio and display receiver assembly]

      U0293

      Rear View Monitor Control


      • Displays rear view monitor (without guide lines).


      • Navigation receiver assembly

      • Radio and display receiver assembly


      • Main body ECU (multiplex network body ECU)

      • Hybrid vehicle control ECU

      Screen does not change to image from camera when reverse (R) has been selected. Screen does not change to image from camera when reverse (R) has been selected.

      [Navigation receiver assembly]

      U0100

      [Radio and display receiver assembly]

      U0100

      Destination Identification


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


      • Navigation receiver assembly

      • Radio and display receiver assembly

      Main body ECU (multiplex network body ECU) Destination is identified based on the latest value (based on the default value if data has never been received) and operation continues. Time zone and language selection screen are different from actual destination.

      [Navigation receiver assembly]

      U0140

      [Radio and display receiver assembly]

      U0140

      Vehicle Customization Function


      • Allows changing of operation and control conditions for vehicle functions via multi-display operation.


      • Navigation receiver assembly

      • Radio and display receiver assembly


      • Main body ECU (multiplex network body ECU)

      • Certification ECU (smart key ECU assembly)

      • Air conditioning amplifier assembly

      - - -

      Time Stamp Function


      • Diagnostic function that links relative time information from the main body ECU (multiplex network body ECU) and absolute time (actual time) obtained from GPS.

      Navigation receiver assembly Main body ECU (multiplex network body ECU) - -

      [Navigation receiver assembly]

      U0073

      Daytime Running Light Control


      • Judges that the vehicle is being driven and turns on/off the daytime running lights.

      Main body ECU (multiplex network body ECU)
      • ECM

      • Hybrid vehicle control ECU

      Daytime running light control does not operate. -

      [Main body ECU (multiplex network body ECU)]

      U0100

      U0293

      Display Automatic Dimming Control


      • Judges bright areas and dark areas using the light sensor signal and dims displays/indicators only in dark areas.

      Main body ECU (multiplex network body ECU) Combination meter sub-assembly Automatic dimming control for displays is performed when taillights are turned on. -

      [Main body ECU (multiplex network body ECU)]

      U0155

      Door Lock


      • Locks/unlocks all doors due to operation of key linked switches.

      Main body ECU (multiplex network body ECU) Airbag ECU assembly Key linked operation is permitted. -

      [Main body ECU (multiplex network body ECU)]

      U0151

      Key Confinement Prevention Control


      • Unlocks the doors when the doors are locked with the key forgotten inside the cabin.

      Main body ECU (multiplex network body ECU) Combination meter sub-assembly Key confinement prevention unlock operation is permitted. -

      [Main body ECU (multiplex network body ECU)]

      U0155

      Back Door Opener


      • Releases the door latch (turns the opener motor on) when the built-in switch of the luggage compartment door opener outer switch turns on (is operated).

      Main body ECU (multiplex network body ECU) Combination meter sub-assembly Back door open control is prohibited. -

      [Main body ECU (multiplex network body ECU)]

      U0155

      Illumination Control


      • Turns on the interior lights when the smart key is brought near the vehicle.

      Main body ECU (multiplex network body ECU) Certification ECU (smart key ECU assembly) Interior light illumination control does not operate when the smart key is brought near the vehicle. -

      [Main body ECU (multiplex network body ECU)]

      U0327

      Footwell Illumination


      • Turns on the footwell illumination.

      Main body ECU (multiplex network body ECU)
      • Combination meter sub-assembly

      • Hybrid vehicle control ECU


      • Footwell illumination is turned on.

      • Footwell illumination does not turn off.

      -

      [Main body ECU (multiplex network body ECU)]

      U0101

      U0155

      Alarm


      • Judges a theft attempt based on changes in door courtesy switch status and requests operation of the warning function.

      Main body ECU (multiplex network body ECU)
      • ECM

      • Certification ECU (smart key ECU assembly)


      • A false alarm sounds when the power switch is turned on (IG) while in arming mode.

      • Engine speed is detected and alarm is not canceled by turning the power switch on (READY).

      -

      [Main body ECU (multiplex network body ECU)]

      U0100

      U0120

      U0293

      LED Headlight Warning Control


      • Detects a malfunction in the LED headlights and informs the user of it.

      Main body ECU (multiplex network body ECU) Hybrid vehicle control ECU LED headlight malfunctions cannot be detected. -

      [Main body ECU (multiplex network body ECU)]

      U0293

      Entry Function


      • Smart lock/unlock / smart back door open / smart back door unlatch.

      • Warning.

      • Performs entry illumination (interior illumination etc.).

      • Smart unlock mode switching answerback.


      • Main body ECU (multiplex network body ECU)

      • Certification ECU (smart key ECU assembly)

      Combination meter sub-assembly
      • Smart lock/unlock and smart back door unlatch do not operate.

      • Smart alarm does not operate.

      • Entry illumination does not operate.

      • Smart unlock is retried.

      • Smart unlock mode switch answerback does not operate.

      -

      [Certification ECU (smart key ECU assembly)]

      U0142

      U0155

      [Main body ECU (multiplex network body ECU)]

      U0327

      Wireless Function


      • Performs operation of wireless lock/unlock or panic functions.

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

      [Certification ECU (smart key ECU assembly)]

      U0142

      ABS Control


      • Helps prevent wheel lockup during sudden stops.

      Brake booster with master cylinder assembly (skid control ECU) Airbag ECU assembly
      • During control: Once control (vehicle behavior stabilization) has completed, further ABS control is prohibited.

      • Not during control: ABS control does not start.


      • Brake warning light (red) turns on.

      • ABS warning light turns on.

      • Slip warning light turns on.

      • Brake warning light (yellow) turns on.

      [Brake booster with master cylinder assembly (skid control ECU)]

      U0073

      U0123

      U0124

      VSC/TRC Control


      • Suppresses vehicle instability such as skidding while turning or wheel slip when starting off.

      Brake booster with master cylinder assembly (skid control ECU)
      • Hybrid vehicle control ECU

      • Spiral cable with sensor sub-assembly (steering angle sensor)

      • Airbag ECU assembly


      • During control: Once control (vehicle behavior stabilization) has completed, further VSC/TRC control is prohibited.

      • Not during control: VSC/TRC control does not start.


      • Brake warning light (red) turns on.

      • ABS warning light turns on.

      • Slip warning light turns on.

      • Brake warning light (yellow) turns on.

      [Brake booster with master cylinder assembly (skid control ECU)]

      U0073

      U0123

      U0124

      U0126

      U0293

      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.

      Brake booster with master cylinder assembly (skid control ECU)
      • Hybrid vehicle control ECU

      • Spiral cable with sensor sub-assembly (steering angle sensor)

      • Airbag ECU assembly


      • During control: When backup control (depressurization control) is complete, further control cannot be performed.

      • Not during control: Control cannot be performed.

      • During control: Depressurization control has completed, further hill start assist control is prohibited.

      • Not during control: Hill start assist control does not start.


      • Brake warning light (red) turns on.

      • ABS warning light turns on.

      • Slip warning light turns on.

      • Brake warning light (yellow) turns on.

      [Brake booster with master cylinder assembly (skid control ECU)]

      U0073

      U0123

      U0124

      U0126

      U0293

      Hybrid Regenerative Operation


      • Regenerative cooperative control with the HV system.

      Brake booster with master cylinder assembly (skid control ECU)
      • Hybrid vehicle control ECU

      • Airbag ECU assembly


      • During control: HV control is continued based on the latest value and gradually decreased. Following this, further HV cooperative control is prohibited.

      • Not during control: HV cooperative control does not start.


      • Brake warning light (red) turns on.

      • ABS warning light turns on.

      • Slip indicator light turns on.

      • Brake warning light (yellow) turns on.

      [Brake booster with master cylinder assembly (skid control ECU)]

      U0073

      U0120

      U0123

      U0124

      U0293

      Steering Assist Calculation


      • Changes assist force based on vehicle speed.

      Power steering ECU assembly Brake booster with master cylinder assembly (skid control ECU) Assist force restricted. EPS warning light illuminates.

      [Power steering ECU assembly]

      U0129

      Steering Assist Start Judgment


      • Permits assist after judging that the power source mode is on (READY).

      Power steering ECU assembly Hybrid vehicle control ECU Steering assist start is not judged while cranking but is judged when the engine starts idling. EPS warning light illuminates.

      [Power steering ECU assembly]

      U0129

      Steering Assist Map Selection


      • Selects proper assist map according to destination, drive system (2WD, 4WD), engine type, etc.

      Power steering ECU assembly Hybrid vehicle control ECU Default assist map is used because proper assist map cannot be selected. - -

      Steering/Steering Angle Sensor Initialization and Zero Point Learning


      • Performs steering/steering angle sensor initialization and zero point learning.

      Power steering ECU assembly
      • Brake booster with master cylinder assembly (skid control ECU)

      • Spiral cable with sensor sub-assembly (steering angle sensor)

      • Airbag ECU assembly

      Steering initialization and zero point learning are not performed. EPS warning light illuminates.

      [Power steering ECU assembly]

      U0129

      Steering Assist Compensation Control


      • Provides steering assist with compensation amount based on vehicle speed.

      Power steering ECU assembly Brake booster with master cylinder assembly (skid control ECU) Assist force restricted. EPS warning light illuminates.

      [Power steering ECU assembly]

      U0129

      Power Switch Backlighting Control


      • Turns on/off the power switch illumination.

      Certification ECU (smart key ECU assembly)
      • Combination meter sub-assembly

      • Main body ECU (multiplex network body ECU)


      • Power switch illumination does not turn on.

      • Combination meter linked light control does not operate.

      -

      [Certification ECU (smart key ECU assembly)]

      U0142

      U0155

      Vehicle Speed Display


      • Displays the vehicle speed on the speedometer according to the vehicle speed signal from brake booster with master cylinder assembly (skid control ECU).

      Combination meter sub-assembly Brake booster with master cylinder assembly (skid control ECU) Control is performed based on signal value of 0. Drive monitor calculation is stopped.

      [Combination meter sub-assembly]

      U0129

      Buzzer


      • Controls sounding of buzzer for various functions.

      Combination meter sub-assembly
      • Airbag ECU assembly

      • Main body ECU (multiplex network body ECU)

      • Brake booster with master cylinder assembly (skid control ECU)

      • Power steering ECU assembly

      • Certification ECU (smart key ECU assembly)

      • Hybrid vehicle control ECU

      • Driving support ECU assembly

      Buzzer stops sounding or does not sound. - -

      Meter Display


      • Displays vehicle condition and controls indicator lights.

      Combination meter sub-assembly
      • ECM

      • Hybrid vehicle control ECU

      • Brake booster with master cylinder assembly (skid control ECU)

      • Airbag ECU assembly

      • Main body ECU (multiplex network body ECU)

      • Power steering ECU assembly

      • Driving support ECU assembly

      • Lane departure warning camera

      Lights do not illuminate or lights remain illuminated. Abnormal light operation.

      [Combination meter sub-assembly]

      U0100

      U0129

      U0131

      U0142

      U0151

      U023A

      U1104

      Multi-information Display


      • Controls the items to be displayed on the multi-information display based on the display request signals and warning signal.

      • Controls the drive monitor display based on information such as the vehicle speed signal, fuel injection volume, etc.

      Combination meter sub-assembly
      • ECM

      • Hybrid vehicle control ECU

      • Brake booster with master cylinder assembly (skid control ECU)

      • Main body ECU (multiplex network body ECU)

      • Driving support ECU assembly

      • Lane departure warning camera

      • Certification ECU (smart key ECU assembly)


      • Displays are controlled based on the latest signal state until the power switch is turned off.

      • Warning indicators are turned off.

      • Numeric part of the drive monitor is not displayed.

      -

      [Combination meter sub-assembly]

      U0100

      U0129

      U0131

      U0142

      U023A

      U1104

      Shift state information display after turning the power switch off


      • Sends shift state information because the power source mode can be turned off only when park (P) has been selected when the power switch has been pressed to turn the power source mode off.

      Transmission control ECU assembly
      • Main body ECU (multiplex network body ECU)

      • Hybrid vehicle control ECU

      None -

      [Transmission control ECU assembly]

      U0146

      P Position Switch Indicator Light Display Function


      • Uses the P switch indicator lamp to indicate the condition when the power switch is off.

      Transmission control ECU assembly Main body ECU (multiplex network body ECU) None -

      [Transmission control ECU assembly]

      U0146

      Shift State Information After Turning The Power Switch Off


      • Sends shift state information because it needs to be displayed on the meter for 2 seconds after the power switch is turned off.

      Transmission control ECU assembly Main body ECU (multiplex network body ECU) None -

      [Transmission control ECU assembly]

      U0146

      Parking Lock System Warning Message


      • Switches between displayed/not displayed of the warning message based on the vehicle speed when the parking lock system malfunction is detected.

      Transmission control ECU assembly Main body ECU (multiplex network body ECU) None -

      [Transmission control ECU assembly]

      U0146

      P Control DTC Detection


      • Used to detect +B open (C2309), HV communication line malfunction (C2311), HV system malfunction (C2315), and CAN communication malfunction (U0146).

      Transmission control ECU assembly Main body ECU (multiplex network body ECU) None -

      [Transmission control ECU assembly]

      U0146

      P Control CPU Sleep Control Transmission control ECU assembly Main body ECU (multiplex network body ECU) IG off state cannot be judged using CAN data. -

      [Transmission control ECU assembly]

      U0146

      P Position Switch Indicator Light Dimmer Control


      • Switches between dimming/not dimming of the P switch indicator light when the dimming/non-dimming signal is received.

      Transmission control ECU assembly Main body ECU (multiplex network body ECU) None -

      [Transmission control ECU assembly]

      U0146

      Drive Torque Control


      • Controls MG1 and MG2 based on engine information received.

      Hybrid vehicle control ECU ECM Vehicle drives using only the motor. HV system warning light turns on.

      [Hybrid vehicle control ECU]

      U0100

      Regenerative Cooperative Control


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

      Hybrid vehicle control ECU Brake booster with master cylinder assembly (skid control ECU) Regeneration is not performed. HV system warning light turns on.

      [Hybrid vehicle control ECU]

      U0129

      High voltage shut off control when the vehicle is damaged


      • Receives the collision detection signal of an airbag signal and shuts off the system main relays.

      Hybrid vehicle control ECU Airbag ECU assembly Normal driving. HV system warning light turns on.

      [Hybrid vehicle control ECU]

      U0151

      HV System Power Processing


      • Determines that an IG2 malfunction cannot be judged when power supply ECU communication error occurs.

      Hybrid vehicle control ECU - Normal driving. HV system warning light turns on.

      [Hybrid vehicle control ECU]

      U1107

      Automatic P Control


      • Instructs the P control ECU to select park (P) when the automatic P request signal from the hybrid vehicle control ECU is on and vehicle speed measured using the MG2 resolver is lower than the specified value.

      Hybrid vehicle control ECU Transmission control ECU assembly Normal driving. HV system warning light turns on.

      [Hybrid vehicle control ECU]

      U1107

      DTC Determination Time Record


      • Stores the time when a DTC is determined.

      Hybrid vehicle control ECU Main body ECU (multiplex network body ECU) Normal driving. HV system warning light turns on.

      [Hybrid vehicle control ECU]

      U0140

      Driver Door Open Warning


      • Provides a warning via the meter when the driver door is open with a shift state other than park (P) selected.

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

      • Combination meter sub-assembly

      Normal driving. HV system warning light turns on.

      [Hybrid vehicle control ECU]

      U0140

      Power Switch (Power Source Control)


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

      Certification ECU (smart key ECU assembly)
      • Transmission control ECU assembly

      • Main body ECU (multiplex network body ECU)

      • Brake booster with master cylinder assembly (skid control ECU)

      • Hybrid vehicle control ECU

      Remote engine start does not operate. -

      [Certification ECU (smart key ECU assembly)]

      U0103

      U0129

      U0140

      U0293

      Steering Sensor


      • Detects steering angle.

      Spiral cable with sensor sub-assembly (steering angle sensor) Brake booster with master cylinder assembly (skid control ECU) None Slip warning light turns on. -

      Dynamic Radar Cruise Control System


      • Controls acceleration/deceleration for following a leading vehicle.

      Driving support ECU assembly
      • Brake booster with master cylinder assembly (skid control ECU)

      • Hybrid vehicle control ECU

      • Spiral cable with sensor sub-assembly (steering angle sensor)

      • Airbag ECU assembly


      • Dynamic radar cruise control system does not operate.

      • Operation of dynamic radar cruise control is canceled.

      Displays messages on the multi-information display.

      [Driving support ECU assembly]

      U0122

      U0123

      U0126

      U0235

      U0293

      U1104

      Pre-crash Safety System


      • Controls seat belt and brake operation just before a collision.

      Driving support ECU assembly
      • Main body ECU (multiplex network body ECU)

      • Brake booster with master cylinder assembly (skid control ECU)

      • Spiral cable with sensor sub-assembly (steering angle sensor)

      • Airbag ECU assembly

      • Hybrid vehicle control ECU


      • Pre-crash safety system does not operate.

      • Pre-crash safety system control does not occur.


      • PCS warning blinks.

      • Displays messages on the multi-information display.

      [Driving support ECU assembly]

      U0122

      U0123

      U0126

      U0142

      U0293

      U1104

      Intelligent Parking Assist System


      • Displays predicted path guide lines on the screen based on the steering amount when reversing.

      • Performs parking assist by indicating the target steering angle while monitoring the steering angle and vehicle speed when reversing.

      Parking assist ECU
      • Main body ECU (multiplex network body ECU)

      • Brake booster with master cylinder assembly (skid control ECU)

      • Power steering ECU assembly

      • Hybrid vehicle control ECU

      • Spiral cable with sensor sub-assembly (steering angle sensor)


      • Predicted path guide lines are not displayed and a message indicating that the guide lines cannot be displayed appears on the bottom of the screen.

      • During adjustment at the factory, the adjustment cannot be completed.

      • Proper system language for destination cannot be selected.

      • Intelligent parking assist system does not operate.


      • Message is displayed on the navigation screen.

      • Informs the user by voice guidance and message display.

      [Parking assist ECU]

      U0073

      U0100

      U0126

      U0129

      U0131

      U0140

      U0293

      U1000

      [Power steering ECU assembly]

      U1105

      Lane Departure Alert System


      • Warns when vehicle is deviating from its lane.

      Lane departure warning camera
      • Main body ECU (multiplex network body ECU)

      • Hybrid vehicle control ECU

      • Combination meter sub-assembly

      • Brake booster with master cylinder assembly (skid control ECU)

      • Airbag ECU assembly

      Lane departure and buzzer warning are canceled. Displays messages on the multi-information display.

      [Lane departure warning camera]

      U0101

      U0123

      U0129

      U0142

      U0155

      Automatic High Beam System


      • Controls high beam on/off.

      Lane departure warning camera
      • Main body ECU (multiplex network body ECU)

      • Hybrid vehicle control ECU

      • Brake booster with master cylinder assembly (skid control ECU)

      • Airbag ECU assembly

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

      [Lane departure warning camera]

      U0101

      U0123

      U0129

      U0142