CAN COMMUNICATION SYSTEM FAIL-SAFE CHART


  1. FAIL-SAFE FUNCTION


    1. When communication fails in any of the main wires (communication lines) due to a short circuit or other causes, the fail-safe function, which is specified for each system, operates to prevent the system from malfunctioning.

    2. The table below shows the effects on each system when communication is impossible. For further details, refer to each system.

      System Function

      1. Control Master

      2. System Related

      3. Control Actuator

      		 Fail-safe Function System Behavior Indicator and Buzzer Behavior or User Notification

      Diagnosis Code

      [Diagnosis Code Hold Condition]
      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.

      Nothing

      [-]

      Electrical Load Control

      (Performs idle up according to the electrical load.)

      1. ECM

      2. Main body ECU (instrument panel junction block assembly), Air conditioning amplifier assembly, Power steering ECU assembly

      3. ECM

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

      Nothing

      [-]

      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: The PTC heater does not operate.

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


        • The idling speed changes.

        • Heater performance becomes worse.

        • The PTC heater does not operate.

      Nothing

      [-]
      ECD

      Charging Control

      (Performs idle up according to charging requests.)

      1. Power management control ECU

      2. Main body ECU (instrument panel junction block assembly), Air conditioning amplifier assembly

      3. ECM

      • Idle up according to charging requests is not performed.

      • Charging control is not prohibited.

      • Idle up according to charging requests is not performed.

      • The tail lights flicker and the blower airflow volume changes.

      Nothing

      [-]

      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

      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.

      Nothing

      [-]

      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

      [Stored until the code is cleared with the GTS.]
      Air conditioning

      Air conditioning compressor control


      • Determines the air conditioning control state based on the coolant temperature signal.

      • Determines the structure of the air conditioning system based on the engine type information and determines the air conditioning control state.

      • Determines the air conditioning control state based on the engine speed signal.

      • Determines the compressor control state based on the acceleration cut signal.

      1. Air conditioning amplifier assembly

      2. ECM

      3. Air conditioning amplifier assembly

      		 Air conditioning compressor does not operate. Nothing

      U0100

      [Stored until the code is cleared with the GTS.]

      Steering wheel position/destination determination control


      • Controls the direction of operation of the servo motor based on the steering wheel position.

      • Controls the air conditioning based on the destination information.

      1. Air conditioning amplifier assembly

      2. Main body ECU (instrument panel junction block assembly)

      3. Air conditioning amplifier assembly

      • Servo motor does not operate.

      • The set temperature range for the heater deviates.

      		 Nothing

      U0142

      [Stored until the code is cleared with the GTS.]

      Ambient temperature control


      • Controls the air conditioning based on the ambient temperature.

      • Performs ambient temperature compensation based on the vehicle speed.

      1. Air conditioning amplifier assembly

      2. Combination meter assembly

      3. Air conditioning amplifier assembly

      		 Air conditioning does not function properly (temperature control is not possible). Nothing

      U0155

      [Stored until the code is cleared with the GTS.]

      Simple load control

      (Cuts the air conditioning load based on the signal from power steering ECU assembly.)

      1. Air conditioning amplifier assembly

      2. Power steering ECU assembly

      3. Air conditioning amplifier assembly

      		 Simple load control cannot be performed. Nothing

      U0131

      [Stored until the code is cleared with the GTS.]
      Airbag Fuel-cut

      1. Center airbag sensor assembly

      2. -

      3. ECM

      		 Airbag operation properly Nothing

      Nothing

      [-]
      SRS warning light control

      1. Center airbag sensor assembly

      2. -

      3. Combination meter assembly

      		 Airbag operation properly Nothing

      Nothing

      [-]
      Event data recorder

      1. Center airbag sensor assembly

      2. ECM, Combination meter assembly

      3. Center airbag sensor assembly

      		 Airbag system operation properly Nothing

      Nothing

      [-]
      Electric parking brake

      Static braking function

      (This function is activated via the driver's operation of the switch when the vehicle is stopped and holds the vehicle in place by electrically activating the parking brake.)

      1. Parking brake with bracket actuator assembly (parking brake ECU)

      2. -

      3. Parking brake with bracket actuator assembly (parking brake ECU)

      		 - Nothing

      Nothing

      [-]

      Dynamic braking function

      (This function decelerates the vehicle during driving using the parking brake.)

      1. Parking brake with bracket actuator assembly (parking brake ECU)

      2. Brake actuator assembly (skid control ECU)

      3. Parking brake with bracket actuator assembly (parking brake ECU)

      • Dynamic PKB is disabled. Static PKB operates even when the vehicle is being driven.

      • The EPB* light illuminates.

      • "CHECK PARKING BRAKE SYSTEM" message is displayed on the multi-information display.

      • The EPB* light illuminates.

      • "CHECK PARKING BRAKE SYSTEM" message is displayed on the multi-information display.

      • U0073

      • U0129

      [Stored until the code is cleared with the GTS.]

      Automatic disengagement function

      (This function disengages the parking brake automatically when the vehicle begins driving while the parking brake is engaged [for M/T].)

      1. Parking brake with bracket actuator assembly (parking brake ECU)

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

      3. Parking brake with bracket actuator assembly (parking brake ECU)

      • Drive away release (DAR) is disabled.

      • The EPB* light illuminates.

      • "CHECK PARKING BRAKE SYSTEM" message is displayed on the multi-information display.

      • The EPB* light illuminates.

      • "CHECK PARKING BRAKE SYSTEM" message is displayed on the multi-information display.

      • U0073

      • U0100

      • U0124

      • U0129

      • U1103

      [Stored until the code is cleared with the GTS.]

      IG OFF Auto-lock Control (IOA)

      (Function which automatically locks the parking brake after the ignition switch is turned off [for M/T].)

      1. Parking brake with bracket actuator assembly (parking brake ECU)

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

      3. Parking brake with bracket actuator assembly (parking brake ECU)

      • IG OFF Auto-apply (IOA) is disabled.

      • The EPB* light illuminates.

      • Auto P-off light illuminates.

      • "CHECK PARKING BRAKE SYSTEM" message is displayed on the multi-information display.

      • The EPB* light illuminates.

      • Auto P-off light illuminates.

      • "CHECK PARKING BRAKE SYSTEM" message is displayed on the multi-information display.

      • U0073

      • U0100

      • U0124

      • U0129

      • U1103

      [Stored until the code is cleared with the GTS.]
      Meter/gauge

      Vehicle Speed Display

      (Displays the vehicle speed on the speedometer according to the vehicle speed signal from the skid control ECU.)

      1. Combination meter assembly

      2. Brake actuator assembly (skid control ECU)

      3. -

      		 Signal is considered to be 0.

      • The speedometer displays 0 km/h (0 mph).

      • The drive monitor stops calculating.

      U0129

      [Stored until the code is cleared with the GTS.]

      Tachometer

      (Displays information on the tachometer.)

      1. Combination meter assembly

      2. ECM

      3. -

      		 Signal is considered to be 0.

      • The tachometer displays 0 rpm.

      • The drive monitor stops calculating.

      U0100

      [Stored until the code is cleared with the GTS.]

      Airbag

      (Turns the SRS warning light on and off.)

      1. Combination meter assembly

      2. Center airbag sensor assembly

      3. -

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

      U0151

      [Stored until the code is cleared with the GTS.]

      Electronic Power Steering Warning

      (Turns the electronic power steering warning light on and off.)

      1. Combination meter assembly

      2. Power steering ECU assembly

      3. -

      		 Signal is considered to be "Active". The electronic power steering warning light illuminates.

      U0131

      [Stored until the code is cleared with the GTS.]

      SLIP Warning

      (Turns the SLIP warning 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.

      Nothing

      [-]

      ECT/ENG System Display

      (Turns the temperature gauge command high engine coolant temperature warning display on and off.)

      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.

      U023A

      [Stored until the code is cleared with the GTS.]
      Power management control

      Push start

      (This system changes the power source mode based on the push start switch signal and requests starter operation when certain conditions are met.)

      1. Power management control ECU

      2. Combination meter assembly, ECM

      3. -

      		 The system does not display the starting prompt "Depress the brake pedal when starting" when it should. -

      U0100

      [Stored until the code is cleared with the GTS.]
      Entry and start

      Entry and start function

      (Entry and start lock, unlock, trunk and warning functions)

      1. Main body ECU (instrument panel junction block assembly), Combination meter assembly

      2. Certification ECU (smart key ECU assembly)

      3. Main body ECU (instrument panel junction block assembly), Combination meter assembly

      • Entry and start lock, unlock and trunk functions do not operate.

      • Entry and start warning function does not operate.

      • Entry and start illumination function does not operate.

      		 -

      Nothing

      [-]

      Wireless function

      (Wireless lock, unlock and panic system)

      1. Main body ECU (instrument panel junction block assembly)

      2. Certification ECU (smart key ECU assembly)

      3. Main body ECU (instrument panel junction block assembly)

      		 Wireless lock, unlock and trunk functions do not operate. -

      Nothing

      [-]

      Ignition switch lighting function

      (Controls ignition switch illumination)

      1. Certification ECU (smart key ECU assembly)

      2. Main body ECU (instrument panel junction block assembly), Combination meter assembly

      3. Certification ECU (smart key ECU assembly)

      • Ignition switch does not illuminate.

      • Ignition switch illumination does not turn off.

      		 -

      Nothing

      [-]
      Main body ECU (instrument panel junction block assembly)

      Wireless/entry and start

      (A system which performs lock, unlock and alarm operations when the entry and start system key is in the detection area of the vehicle. This system controls remote control operations such as the lock and unlock operations.)

      1. Main body ECU (instrument panel junction block assembly)

      2. Certification ECU (smart key ECU assembly)

      3. -

      • Wireless and entry and start control does not operate.

      • Door lock and unlock control does not operate.

      • Entry and start back door opener does not operate.

      		 -

      Nothing

      [-]

      Auto lock control

      (This system automatically locks all doors when the vehicle is being driven. It also automatically locks all doors according to the shift position.)

      1. Main body ECU (instrument panel junction block assembly)

      2. ECM

      3. -

      		 Auto lock control does not operate. -

      Nothing

      [-]

      Daytime running lights (DRL) control

      (This system controls the daytime running lights when it determines that the vehicle is being driven.)

      1. Main body ECU (instrument panel junction block assembly)

      2. ECM

      3. -

      		 DRL control does not operate. -

      Nothing

      [-]

      Manual memory function

      (A system which memorizes and recalls the positions of the seat, mirrors and steering wheel.)

      1. Main body ECU (instrument panel junction block assembly)

      2. Position control ECU assembly

      3. Position control ECU assembly

      		 Memory function operation is prohibited. -

      U0208

      [Stored until the code is cleared with the GTS.]
      Vehicle stability control

      Anti-lock Brake System Control

      (Prevents the wheels from locking during sudden stops.)

      1. Brake actuator assembly (skid control ECU)

      2. -

      3. Brake actuator assembly (skid control ECU)

      		 Only EBD control operates (Brake warning light, anti-lock brake system indicator and SLIP indicator illuminate.)

      • The brake warning light illuminates.

      • The anti-lock brake system indicator illuminates.

      • The SLIP indicator illuminates.

      U0073

      [Stored until the code is cleared with the GTS.]

      Vehicle Stability Control

      (Suppresses sliding sideways when the driver suddenly turns the steering wheel while driving at high speeds, on snowy roads, etc.)

      1. Brake actuator assembly (skid control ECU)

      2. ECM, Spiral with sensor cable subassembly (steering angle sensor), Yaw rate sensor

      3. Brake actuator assembly (skid control ECU)

      • VSC operation prohibited.

      • The SLIP indicator illuminates.

      • Only EBD control operates (Brake warning light, anti-lock brake system indicator and SLIP indicator illuminate.)

      • The brake warning light illuminates.

      • The anti-lock brake system indicator illuminates.

      • The SLIP indicator illuminates.

      • U0073

      • U0100

      • U0123

      • U0126

      [Stored until the code is cleared with the GTS.]
      Vehicle stability control

      Traction Control

      (Ensures stability and traction by performing torque control. This control uses the engine speed and accelerator pedal position.)

      1. Brake actuator assembly (skid control ECU)

      2. ECM, Spiral with sensor cable subassembly (steering angle sensor), Yaw rate sensor

      3. Brake actuator assembly (skid control ECU)

      • TRC operation prohibited.

      • The SLIP indicator illuminates.

      • Only EBD control operates (Brake warning light, anti-lock brake system indicator and SLIP indicator illuminate.)

      • The brake warning light illuminates.

      • The anti-lock brake system indicator illuminates.

      • The SLIP indicator illuminates.

      • U0073

      • U0100

      • U0123

      • U0126

      [Stored until the code is cleared with the GTS.]

      Hill-start Assist Control

      (Braking torque is maintained to prevent the vehicle from slipping backwards when stopped on an uphill slope.)

      1. Brake actuator assembly (skid control ECU)

      2. ECM, Spiral with sensor cable subassembly (steering angle sensor), Yaw rate sensor

      3. Brake actuator assembly (skid control ECU)

      • Hill-start assist control operation prohibited.

      • The SLIP indicator illuminates.

      • Only EBD control operates (Brake warning light, anti-lock brake system indicator and SLIP indicator illuminate.)

      • The brake warning light illuminates.

      • The anti-lock brake system indicator illuminates.

      • The SLIP indicator illuminates.

      • U0073

      • U0100

      • U0123

      • U0126

      [Stored until the code is cleared with the GTS.]

      Emergency Brake Signal

      (Flashes the hazard lights when the emergency brake is depressed.)

      1. Brake actuator assembly (skid control ECU)

      2. Combination meter assembly

      3. Brake actuator assembly (skid control ECU)

      		 Emergency brake signal function prohibited. Emergency brake signal function prohibited.

      Nothing

      [-]

      1. Brake actuator assembly (skid control ECU)

      2. ECM, Spiral with sensor cable subassembly (steering angle sensor), Yaw rate sensor

      3. Brake actuator assembly (skid control ECU)

      • Emergency brake signal function prohibited.

      • The SLIP indicator illuminates.

      • Only EBD control operates (Brake warning light, anti-lock brake system indicator and SLIP indicator illuminate.)

      • The brake warning light illuminates.

      • The anti-lock brake system indicator illuminates.

      • The SLIP indicator illuminates.

      • U0073

      • U0100

      • U0123

      • U0126

      [Stored until the code is cleared with the GTS.]

      Pre-crash Safety

      (Applies the brakes based on information from the radar and camera to avoid a collision.)

      1. Brake actuator assembly (skid control ECU)

      2. Pre-crash safety city sensor

      3. Brake actuator assembly (skid control ECU)

      		 Pre-crash safety brake operation prohibited. No VSC ECU warning display.

      Nothing

      [-]

      1. Brake actuator assembly (skid control ECU)

      2. ECM, Spiral with sensor cable subassembly (steering angle sensor), Yaw rate sensor

      3. Brake actuator assembly (skid control ECU)

      		 Pre-crash safety brake operation prohibited.

      • The brake warning light illuminates.

      • The anti-lock brake system indicator illuminates.

      • The SLIP indicator illuminates.

      • U0073

      • U0100

      • U0123

      • U0126

      [Stored until the code is cleared with the GTS.]
      AFS

      AFS Control

      (Moves the headlights up, down, left or right depending on the turning radius and yaw rate calculated from the steering angle and wheel speed values.)

      1. Headlight swivel ECU assembly

      2. Main body ECU (instrument panel junction block assembly)

      3. -

      		 AFS operates normally. AFS OFF indicator blinks.

      • U0100

      • U0101

      • U0126

      • U0129

      • U0130

      • U0142

      [Stored until the code is cleared with the GTS.]

      1. Headlight swivel ECU assembly

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

      		 Lights are instructed to return to the front-facing position.
      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

      3. -

      		 No assist when the vehicle speed is 0 km/h (0 mph). Assist starts when the vehicle speed is 0.1 km/h (0 mph) or more. Before assist begins operation: EPS indicator illuminates. After assist begins operation: No indication.

      U0100

      [Stored until the code is cleared with the GTS.]

      1. Power steering ECU assembly

      2. Brake actuator assembly (skid control ECU)

      3. -

      		 Temporary control is performed with the vehicle speed set to 100 km/h (62 mph). EPS indicator illuminates.

      U0129

      [Stored until the code is cleared with the GTS.]

      αB control

      (Helps prevent the vehicle from drifting.)

      1. Brake actuator assembly (skid control ECU)

      2. Brake actuator assembly (skid control ECU)

      3. Power steering ECU assembly

      • If VSC CAN data becomes invalid during control, control finishes.

      • If VSC CAN data becomes abnormal during control, control stops.

      		 EPS indicator illuminates.

      U0129

      [Stored until the code is cleared with the GTS.]
      Driver seat

      Memory recall function

      (Function to recall recorded positions according to the switch operation.)

      1. Main body ECU (instrument panel junction block assembly), Position control ECU assembly

      2. Position control ECU assembly, ECM, Combination meter assembly

      3. Position control ECU assembly

      		 Recall function does not operate. Nothing

      Nothing

      [-]
      Memory function

      1. Main body ECU (instrument panel junction block assembly), Position control ECU assembly

      2. Position control ECU assembly

      3. -

      		 Recall function does not operate. Nothing

      Nothing

      [-]
      Audio Display

      Eco Navigation Display

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

      1. Radio and display receiver assembly

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

      3. -

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

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

      		 Nothing

      • U0100

      • U0129

      • U0155

      [Stored until the DTC is cleared with the GTS.]

      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

      2. Main body ECU (instrument panel junction block assembly)

      3. -

      		 The time zone and language selection screens do not match the destination. Nothing

      U0140

      [Stored until the DTC is cleared with the GTS.]

      Vehicle Customize Function

      (Changes the behavior and control parameters of various functions (illumination lighting time, etc.) according to user operation via the screen.)

      1. Radio and display receiver assembly

      2. Air conditioning amplifier assembly, Certification ECU (smart key ECU assembly), Main body ECU (instrument panel junction block assembly), Position control ECU assembly

      3. -

      		 Customize functions related to ACN/BDB/IDT/ DST ECU are not displayed, or changes to their values are not indicated. Nothing

      • U0073

      • U0140

      • B15F6

      • B15F7

      [Stored until the DTC is cleared with the GTS.]
      Pre-crash City

      Pre-crash Safety

      (When there is high possibility of collision with an obstacle in front of the vehicle, warnings are issued and the automatic brake operates.)

      1. Pre-crash safety city sensor

      2. -

      3. -

      • Control disabled.

      • Automatic brake disabled.

      • Meter buzzer sounds.

      • Indicator blinks.

      • Displays messages on the multi-information display.

      • U0100

      • U0123

      • U0126

      • U0129

      • U023A

      [Stored until the DTC is cleared with the GTS.]
      Lane Departure Alert

      1. Pre-crash safety city sensor

      2. -

      3. -

      		 Control disabled.

      • Meter buzzer sounds.

      • Telltale turns off.

      • Displays messages on the multi-information display.

      • U0100

      • U0123

      • U0126

      • U0129

      [Stored until the DTC is cleared with the GTS.]
      Road Sign Assist

      1. Pre-crash safety city sensor

      2. -

      3. -

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

      • U0100

      • U0123

      • U0129

      [Stored until the DTC is cleared with the GTS.]
      Stop and Start

      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 (instrument panel junction block assembly), Air conditioning amplifier assembly, Center airbag sensor assembly, Combination meter assembly, Spiral with sensor cable subassembly (steering angle sensor), Yaw rate sensor, Power steering ECU assembly, Parking brake with bracket actuator assembly (parking brake ECU)

      3. ECM

      • During stop and start: Restarts.

      • Not during stop and start: Prohibits stop and start.

      		 ECO driving indicator light blinks.

      • U0100

      • U0121

      • U0123

      • U0126

      • U0131

      • U0140

      • U0151

      • U0155

      • U0164

      • U1106

      [Stored until the DTC is cleared with the GTS.]