CAN COMMUNICATION SYSTEM FAIL-SAFE CHART


  1. FAIL-SAFE FUNCTION


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

    2. The following table shows the effects on each system when communication is impossible. (For further details, see the pages for each system.)

      Function Control Master System Related Fail-safe Operation Driver Detectable

      DTC Detection

      (ECU that stored DTC)

      Air Conditioning Control


      • Corrects engine speed, such as for idle up.

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

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

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

      U0100

      (Air conditioning amplifier assembly)

      Compressor Control


      • Judges compressor lock according to engine speed.

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

      U0100

      (Air conditioning amplifier assembly)

      Simple Load Control


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

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

      U0131

      (Air conditioning amplifier assembly)

      Panel Dimming Control


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

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

      U0142

      (Air conditioning amplifier assembly)

      Destination Identification Control


      • Changes air conditioning control pattern according to destination.

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

      U0142

      (Air conditioning amplifier assembly)

      Remote Start Control


      • Controls air conditioning system operation condition according to remote start signal.

      		 Air conditioning amplifier assembly Main body ECU (Multiplex network body ECU) Air conditioning system does not activate based on remote start signal. - -

      Ambient Temperature Correction Control


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

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

      • Correction level for displayed ambient temperature declines.

      • Correction level for outlet airflow declines.

      U0155

      (Air conditioning amplifier assembly)

      Fuel Consumption Display


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

      • Navigation receiver assembly (for navigation receiver type)

      • Radio and display receiver assembly (for radio and display type)

      • ECM

      • Brake actuator assembly (Skid control ECU)

      • Combination meter assembly

      When communication with ECM or skid control ECU is interrupted:


      • Display is not updated.

      When communication with combination meter is interrupted:


      • Display is not updated.

      • Numeric part of driveable mileage is cleared.

      		 -

      U0100

      U0129

      U0155

      (Navigation receiver assembly)

      (Radio and display receiver assembly)

      Destination Identification


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

      • Navigation receiver assembly (for navigation receiver type)

      • Radio and display receiver assembly (for radio and display type)

      		 Main body ECU (Multiplex network body ECU) Destination is identified based on information received before communication is interrupted. Time zone and language selection screen are different from actual destination.

      U0140

      (Navigation receiver assembly)

      (Radio and display receiver assembly)

      Vehicle Customization Function


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

      • Navigation receiver assembly (for navigation receiver type)

      • Radio and display receiver assembly (for radio and display type)

      • Smart key ECU assembly (Certification ECU)

      • Main body ECU (Multiplex network body ECU)

      • Customization via multi-display is not possible, but customization via main body ECU is possible.

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

      		 Customizable items are not displayed.

      U0073

      (Navigation receiver assembly)

      (Radio and display receiver assembly)

      Door Lock


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

      		 Main body ECU (Multiplex network body ECU)

      • ECM

      • Combination meter assembly

      • Speed sensitive automatic lock control does not occur.

      • Shift linked automatic lock control does not occur.

      • Shift linked automatic unlock control does not occur.

      • Automatic lock/unlock cannot be changed.

      		 -

      U0100

      U0155

      (Main body ECU (Multiplex network body ECU))

      Display Automatic Dimming


      • Display dimming control.

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

      U0155

      (Main body ECU (Multiplex network body ECU))
      Illumination Control Main body ECU (Multiplex network body ECU) Smart key ECU assembly (Certification ECU) Interior lights turn off. -

      U0327

      (Main body ECU (Multiplex network body ECU))

      Accessories


      • Gateway between BERKES and CAN communication systems.

      		 Main body ECU (Multiplex network body ECU)

      • ECM

      • ECT

      • Combination meter assembly

      • Air conditioning amplifier assembly

      • Smart key ECU assembly (Certification ECU)

      		 Remote starter function does not operate. -

      U0100

      U0101

      U0155

      U0164

      U0327

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

      Parking Assist System Control


      • Judges shift lever position.

      • Judges vehicle speed.

      		 Clearance warning ECU Assembly

      • ECM

      • TCM

      • Main body ECU (Multiplex network body ECU)

      • Combination meter assembly

      		 Obstacle detection is stopped. -

      When communication with ECM or TCM is interrupted:


      • U0101 (Clearance warning ECU Assembly)

      When communication with main body ECU (multiplex network body ECU) is interrupted:


      • U0142 (Clearance warning ECU Assembly)

      When communication with combination meter is interrupted:


      • U0155 (Clearance warning ECU Assembly)
      Daytime Running Light Control Main body ECU (Multiplex network body ECU) ECM Daytime running light control does not operate. -

      U0100

      (Main body ECU (Multiplex network body ECU))

      Blind Spot Monitor Control


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

      		 Blind spot monitor sensor RH

      • ECM

      • Steering sensor

      • Brake actuator assembly (Skid control ECU)

      • Main body ECU (Multiplex network body ECU)

      • Blind spot monitor sensor RH

      		 Blind spot monitor control is prohibited. Blind spot monitor system warning light on the combination meter turns on.

      U0100

      U0126

      U0129

      U0142

      U0232

      (Blind spot monitor sensor RH)

      Gateway System

      (Between V bus and sub bus 2)


      • Relays data between V bus and sub bus 2, and monitors ECUs connected to sub bus 2.

      		 -

      • Blind spot monitor sensor RH

      • Rear television camera assembly

      • Lane departure warning camera

      • Driving support ECU assembly

      		 Stagnant frame data in gateway is deleted by initializing CAN controller and communication software including gateway. -

      U0104

      U0233

      U023A

      U0265

      U1002

      (Network gateway ECU)

      Electric Load Control


      • Performs idle up according to electric loads.

      		 ECM

      • Power steering ECU assembly

      • Main body ECU (Multiplex network body ECU)

      • Air conditioning amplifier assembly

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

      Air Conditioning Cooperative Operation


      • Performs idle up according to compressor load.

      • Performs air conditioning cut control.

      		 ECM Air conditioning amplifier assembly

      Air conditioning system does not use cooperative controls.

      (Idle up is not performed.)

      		 Air conditioning system does not operate. -

      Charge Control


      • Performs idle up according to charging request.

      		 Smart key ECU assembly (Certification ECU)

      • Main body ECU (Multiplex network body ECU)

      • Air conditioning amplifier assembly

      		 Idle up according to charging request is not performed. Taillights flicker and blower airflow changes. -

      Eco Control


      • Adjusts throttle response in consideration of actual fuel economy.

      		 ECM

      • Main body ECU (Multiplex network body ECU)

      • Air conditioning amplifier assembly

      		 Eco mode does not operate. - -

      Coast Downshift Timing Change According to Air Conditioning Load


      • Delays upshifts according to warm-up request.

      • ECT

      • ECM

      		 Air conditioning amplifier assembly Coast downshift does not occur. Coast downshift shock reduction performance deteriorates. -

      Power Steering Control (for 2GR-FE)


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

      		 Power steering ECU assembly

      • ECM

      • Brake actuator assembly (Skid control ECU)

      • Steering sensor

      When communication with skid control ECU is interrupted:


      • Control continues based on a default speed of 140 km/h (87 mph) because vehicle speed is unrecognizable.

      		 EPS warning light illuminates.

      U0100

      U0129

      (Power steering ECU assembly)

      Power Steering Control (for 2AR -FE)


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

      		 Power steering ECU with motor assembly

      • ECM

      • Brake actuator assembly (Skid control ECU)

      • Steering sensor

      When communication with ECM is interrupted:


      • Power steering assist is not provided.

      When communication with skid control ECU is interrupted:


      • Control continues based on a default speed of 100 km/h (62 mph) because vehicle speed is indeterminable. (Steering wheel feels heavy when the vehicle speed is below 100 km/ h (62 mph) and feels light at speeds above 100 km/h (62 mph).)

      		 EPS warning light illuminates.

      U0100

      U0129

      (Power steering ECU with motor assembly)

      Steering Assist Calculation (for 2GR-FE)


      • Changes assist force based on vehicle speed.

      		 Power steering ECU assembly Brake actuator assembly (Skid control ECU) Control continues based on a default speed of 140 km/h (87 mph) because vehicle speed is indeterminable. EPS warning light illuminates.

      U0129

      (Power steering ECU assembly)

      Steering Assist Calculation (for 2AR -FE)


      • Changes assist force based on vehicle speed.

      		 Power steering ECU with motor assembly Brake actuator assembly (Skid control ECU) Control continues based on a default speed of 100 km/h (62 mph) because vehicle speed is indeterminable. (Steering wheel feels heavy when the vehicle speed is below 100 km/h (62 mph) and feels light at speeds above 100 km/h (62 mph).) EPS warning light illuminates.

      U0129

      (Power steering ECU with motor assembly)
      Steering/Steering Angle Sensor Initialization and Zero Point Learning (for 2AR -FE) Power steering ECU with motor assembly Brake actuator assembly (Skid control ECU) Steering initialization and zero point learning are not performed. EPS warning light illuminates.

      U0129

      (Power steering ECU with motor assembly)

      Assist Map Selection (for 2GR-FE)


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

      		 Power steering ECU assembly

      • ECM

      • Brake actuator assembly (Skid control ECU)

      Default map is used to assist because proper assist map cannot be selected.

      (Steering feel may be different.)

      		 -

      C1582

      (Power steering ECU assembly)

      Assist Map Selection (for 2AR -FE)


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

      		 Power steering ECU with motor assembly

      • ECM

      • Brake actuator assembly (Skid control ECU)

      Default map is used to assist because proper assist map cannot be selected.

      (Steering feel may be different.)

      		 EPS warning light illuminates.

      U0100

      U0129

      (Power steering ECU with motor assembly)

      Entry Function


      • Entry lock/unlock, entry luggage compartment open.

      • Warning.

      • Performs entry illumination

        (interior illumination etc)

      • Main body ECU (Multiplex network body ECU)

      • Smart key ECU assembly (Certification ECU)

      • Main body ECU (Multiplex network body ECU)

      • Combination meter assembly

      		 Entry unlock is performed again.

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

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

      • Entry illumination does not operate.

      U0142

      U0155

      (Main body ECU (Multiplex network body ECU))

      Wireless Function


      • Locks and unlocks doors, etc. via remote operation.

      		 Main body ECU (Multiplex network body ECU) Smart key ECU assembly (Certification ECU) Wireless lock, unlock and luggage compartment opener do not operate. - -

      Remote Engine Start Function


      • Remote engine start ECU indicates data to permit immobiliser to be unset.

      		 Smart key ECU assembly (Certification ECU) Main body ECU (Multiplex network body ECU) Remote engine start does not operate. -

      U0142

      Smart key ECU assembly (Certification ECU)

      Engine Switch Backlighting Control


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

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

      U0142

      Smart key ECU assembly (Certification ECU)

      Meter Display


      • Displays vehicle condition and controls indicator lights.

      		 Combination meter assembly

      • ECM

      • Brake actuator assembly (Skid control ECU)

      • Airbag sensor assembly

      • Power steering ECU assembly

      • Main body ECU (Multiplex network body ECU)

      		 Lights do not illuminate or lights always illuminate. Lights do not illuminate properly or do not illuminate at all.

      U0100

      U0129

      U0131

      U0142

      U0151

      (Combination meter assembly)
      Vehicle Speed Display Combination meter assembly Brake actuator assembly (Skid control ECU) Vehicle speed display remains at 0 km/h (0 mph). -

      U0129

      (Combination meter assembly)

      Tachometer


      • Displays engine speed.

      		 Combination meter assembly ECM The needle points at 0 rpm. -

      U0100

      (Combination meter assembly)
      Coolant Temperature Display Combination meter assembly ECM Display is turned off. - -

      Engine Start/Stop Switch

      (Power Source Mode Change)


      • Using start/stop switch signal as trigger, changes power source mode automatically and requests starter operation when conditions are met.

      		 Smart key ECU assembly (Certification ECU) ECM - -

      U0100

      (Smart key ECU assembly (Certification ECU))
      ABS/TRAC/VSC Control Brake actuator assembly (Skid control ECU)

      • ECM

      • Steering sensor

      • Airbag sensor assembly

      		 Control stops. Warning lights and indicators illuminate.

      U0073

      U0100

      U0123

      U0126

      (Brake actuator assembly (Skid control ECU))

      Dynamic Radar Cruise Control System


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

      		 ECM

      • Brake actuator assembly (Skid control ECU)

      • Steering sensor

      • Airbag sensor assembly

      • Combination meter

      • Main body ECU (Multiplex network body ECU)

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

      U0100

      U0122

      U0123

      U0126

      (ECM)

      Pre-collision System


      • Controls the brakes immediately before a crash.

      		 Driving support ECU assembly

      • Brake actuator assembly (Skid control ECU)

      • ECM

      • Steering sensor

      • Airbag sensor assembly

      • Main body ECU (Multiplex network body ECU)

      		 Control stops.

      • Displays messages on the multi-information display.

      • PCS indicator light flashes.

      U0125

      U0126

      U0129

      (Driving support ECU assembly)

      Lane Departure Alert System


      • Warns when vehicle is deviating from its lane.

      		 Lane departure warning camera

      • Main body ECU (Multiplex network body ECU)

      • ECM

      • Combination meter

      • Brake actuator assembly (Skid control ECU)

      • Airbag sensor assembly

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

      U0100

      U0101

      U0123

      U0129

      U0142

      U0155

      (Lane departure warning camera)

      Automatic High Beam System


      • Controls high beam on/off.

      		 Lane departure warning camera

      • Main body ECU (Multiplex network body ECU)

      • ECM

      • Brake actuator assembly (Skid control ECU)

      • Airbag sensor assembly

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

      U0100

      U0101

      U0123

      U0129

      U0142

      (Lane departure warning camera)

      Back Guide Monitor


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

      		 Rear television camera assembly

      • ECM

      • Steering sensor

      • Brake actuator assembly (Skid control ECU)

      • Main body ECU (Multiplex network body ECU)

      • Power steering ECU assembly (for 2GR-FE)

      • Power steering ECU with motor assembly (for 2AR-FE)

      • Clearance warning ECU assembly

      • Radio and display receiver assembly (for Radio and Display Type with Parking Assist Monitor System)

      		 Back guide monitor function is prohibited.

      • Predicted path guide lines are not displayed.

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

      U0073

      U0126

      U0140

      U0163

      U1000

      U1110

      (Rear television camera assembly)

      Auto Location


      • Brake actuator assembly (Displays the location and pressure value of all tires on the combination meter assembly.)

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

      U0129

      (Tire pressure warning ECU and receiver)