FAIL-SAFE FUNCTION
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.
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
(Main ECU to determine controls) |
System Related | Fail-safe Operation | Driver Detectable | DTC Detection
(ECU that stored DTC) |
|---|---|---|---|---|---|
| Anti-lock Brake System Control
·
Avoids wheel lockup to assist vehicle stability when the brake pedal is fully depressed. |
Brake actuator assembly | - | Only electric brake force distribution control is available. | ·
ABS warning light illuminates. ·
Slip indicator light illuminates. ·
Brake hold operated indicator light blinks. ·
Displays messages on the multi-information display. |
U007488
(Brake actuator assembly) |
| Vehicle Stability Control
·
Prevents the vehicle from skidding when the steering wheel is turned abruptly by the driver when on highways, snowy roads, etc. |
Brake actuator assembly | ·
ECM ·
Steering sensor ·
Airbag sensor with ECU assembly |
Only electric brake force distribution control is available. | ·
ABS warning light illuminates. ·
Slip indicator light illuminates. ·
Brake hold operated indicator light blinks. ·
Displays messages on the multi-information display. |
U007488
(Brake actuator assembly) |
| Control stops. | ·
Slip indicator light illuminates. ·
Brake hold operated indicator light blinks. ·
Displays messages on the multi-information display. |
U010087
U010187 U012587 U012687 (Brake actuator assembly) |
|||
| Traction Control
·
Controls torque to ensure vehicle stability and traction. This control uses the engine speed and accelerator pedal position. |
Brake actuator assembly | ·
ECM ·
Steering sensor ·
Airbag sensor with ECU assembly |
Only electric brake force distribution control is available. | ·
ABS warning light illuminates. ·
Slip indicator light illuminates. ·
Brake hold operated indicator light blinks. ·
Displays messages on the multi-information display. |
U007488
(Brake actuator assembly) |
| Control stops. | ·
Slip indicator light illuminates. ·
Brake hold operated indicator light blinks. ·
Displays messages on the multi-information display. |
U010087
U010187 U012587 U012687 (Brake actuator assembly) |
|||
| Hill-start Assist Control
·
Maintains brake torque in order to prevent the vehicle from rolling backwards when stopped on an uphill road. |
Brake actuator assembly | ·
ECM ·
Steering sensor ·
Airbag sensor with ECU assembly |
Only electric brake force distribution control is available. | ·
ABS warning light illuminates. ·
Slip indicator light illuminates. ·
Brake hold operated indicator light blinks. ·
Displays messages on the multi-information display. |
U007488
(Brake actuator assembly) |
| Control stops. | ·
Slip indicator light illuminates. ·
Brake hold operated indicator light blinks. ·
Displays messages on the multi-information display. |
U010087
U010187 U012587 U012687 (Brake actuator assembly) |
|||
| Pre-collision System
·
Applies the brakes based on information from the radar/camera system in order to avoid a collision. |
Brake actuator assembly | Forward recognition camera | Only electric brake force distribution control is available. | ·
ABS warning light illuminates. ·
Slip indicator light illuminates. ·
Brake hold operated indicator light blinks. ·
Displays messages on the multi-information display. |
U007488
(Brake actuator assembly) |
| Control stops. | - | - | |||
| Dynamic Radar Cruise Control System
·
Applies the brakes to maintain an appropriate distance with the preceding vehicle. |
Brake actuator assembly | ECM | Only electric brake force distribution control is available. | ·
ABS warning light illuminates. ·
Slip indicator light illuminates. ·
Brake hold operated indicator light blinks. ·
Displays messages on the multi-information display. |
U007488
(Brake actuator assembly) |
| Control stops. | - | - | |||
| Secondary Collision Control System
·
Applies the brakes to decelerate the vehicle after detecting a collision and to prevent or reduce the impact of a secondary collision. |
Brake actuator assembly | ·
Airbag sensor with ECU assembly ·
ECM |
Only electric brake force distribution control is available. | ·
ABS warning light illuminates. ·
Slip indicator light illuminates. ·
Brake hold operated indicator light blinks. ·
Displays messages on the multi-information display. |
U007488
(Brake actuator assembly) |
| Secondary collision control system is disabled. | Displays messages on the multi-information display. | U015187
(Brake actuator assembly) |
|||
| Brake Hold Function
·
Maintains the brake fluid pressure in order to keep the vehicle stationary when the brake pedal is released when the vehicle is stationary. |
Brake actuator assembly | ·
ECM ·
Steering sensor ·
Airbag sensor with ECU assembly ·
Main body ECU (multiplex network body ECU) |
Control stops. | Brake hold operated indicator light blinks. | U010087
U010187 U012587 U012687 U014087 (Brake actuator assembly) |
| Electric Parking Brake System (Drive Away Release Operation)
·
Automatically disengages the electric parking brake system when the accelerator pedal is depressed. |
Brake actuator assembly | ·
ECM ·
Airbag sensor with ECU assembly ·
Main body ECU (multiplex network body ECU) |
Only electric brake force distribution control is available. | ·
ABS warning light illuminates. ·
Slip indicator light illuminates. ·
Brake hold operated indicator light blinks. ·
Displays messages on the multi-information display. |
U007488
(Brake actuator assembly) |
| Control stops. | Brake warning light / yellow (minor malfunction) illuminates. | U010087
U010187 U012587 U014087 (Brake actuator assembly) |
|||
| Electric Parking Brake System (Shift Synchronized Operation)
·
Locks/Releases the electric parking brake when the driver changes the shift position. |
Brake actuator assembly | ECM | Only electric brake force distribution control is available. | ·
ABS warning light illuminates. ·
Slip indicator light illuminates. ·
Brake hold operated indicator light blinks. ·
Displays messages on the multi-information display. |
U007488
(Brake actuator assembly) |
| Control stops. | Brake warning light / yellow (minor malfunction) illuminates. | U010087
U010187 (Brake actuator assembly) |
|||
| Vehicle Speed Display | Combination meter assembly | Brake actuator assembly | Speedometer is controlled based on a default vehicle speed of 0 km/h (0 mph). | ·
Brake warning light / red (malfunction) illuminates. ·
ABS warning light illuminates. ·
VSC OFF indicator light illuminates. |
U012987
(Combination meter assembly) |
| Tachometer Display | Combination meter assembly | ECM | Needle of tachometer remains at 0 rpm. | MIL illuminates. | U010087
(Combination meter assembly) |
| Meter Display
·
Displays vehicle condition and controls indicator lights. |
Combination meter assembly | ·
Power steering ECU with motor assembly ·
Main body ECU (multiplex network body ECU) ·
Airbag sensor with ECU assembly ·
Forward recognition camera ·
Air conditioning amplifier assembly ·
Certification ECU (smart key ECU assembly) ·
ECM ·
Steering sensor ·
Brake actuator assembly ·
Engine stop and start ECU |
Vehicle information is not displayed. | Abnormal light operation | U013187
U014087 U015187 U016487 U016887 U023A87 U110387 U111287 U113387 (Combination meter assembly) |
| 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 with motor assembly | While the ignition switch is ON, previous values are maintained (during a reset, there is no load control). | - | U0131
(Air conditioning amplifier assembly) |
| Panel Dimming Control
·
Outputs dimming information to the A/C panel according to the display dimming information. |
Air conditioning amplifier assembly | Main body ECU (multiplex network body ECU) | While the ignition switch is ON, previous values are maintained (during a reset, dimming control is performed). | - | U0142
(Air conditioning amplifier assembly) |
| Destination Determination Control
·
Switches the A/C control pattern according to the destination information. |
Air conditioning amplifier assembly | Main body ECU (multiplex network body ECU) | While the ignition switch is ON, previous values are maintained. | - | U0142
(Air conditioning amplifier assembly) |
| 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) |
| Entry Function
·
Entry lock/unlock. ·
Performs entry illumination (Interior illumination etc.). |
Certification ECU (smart key ECU assembly) | ·
ECM ·
Main body ECU (multiplex network body ECU) |
·
When an entry unlock operation is performed with a door open, entry unlock is performed. ·
When an entry lock operation is performed with a door open, a door ajar warning operates. |
- | U0100
U0142 (Certification ECU (smart key ECU assembly)) |
| Wireless Function
·
Operates the wireless lock/unlock functions, etc. |
Certification ECU (smart key ECU assembly) | Main body ECU (multiplex network body ECU) | Wireless function is not performed. | - | U0142
(Certification ECU (smart key ECU assembly)) |
| Engine Switch Backlighting Control
·
Illuminates or turns off the engine switch illumination based on the status of the interior lights, etc. |
Certification ECU (smart key ECU assembly) | ·
Main body ECU (multiplex network body ECU) ·
Combination meter assembly |
·
Engine switch backlight does not illuminate. ·
Engine switch backlight goes dim. |
- | U0142
U0155 (Certification ECU (smart key ECU assembly)) |
| Engine System Indicator Display
·
Estimates whether injectors are clogged and requests that a message be displayed informing user that injectors need maintenance. ·
Estimates whether oil has deteriorated and requests that a message be displayed informing user that oil needs to be replaced. |
ECM | Combination meter assembly | System is unable to inform user that oil needs to be replaced or injectors need maintenance. | Combination meter display cannot be cleared. | - |
| Electric Load Control
·
Performs idle up according to electric load. |
ECM | ·
Air conditioning amplifier assembly ·
Power steering ECU with motor assembly ·
Main body ECU (multiplex network body ECU) |
Idle up according to electric load is not performed. | Engine idle speed changes. | - |
| 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. |
ECM | ·
Air conditioning amplifier assembly ·
Main body ECU (multiplex network body ECU) |
Idle up according to charging request is not performed. | Taillights flicker and blower airflow changes. | - |
| Integrated Control (VDM)
·
Estimates the driver requested torque based on the accelerator pedal operation and performs torque characteristic control according to driving conditions so that driveability, acceleration performance and acceleration feeling are improved. |
ECM | ·
Forward recognition camera ·
Brake actuator assembly ·
Airbag sensor with ECU assembly ·
Steering sensor |
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, driveability, acceleration performance and acceleration feeling are not improved. | - | - |
| Eco Control
·
Adjusts throttle response in consideration of actual fuel economy. |
ECM | Air conditioning amplifier assembly | Eco mode does not operate. | - | - |
| Neutral Control
·
Reduces engine load and performs idle up. |
ECM | ·
Brake actuator assembly ·
Airbag sensor with ECU assembly |
Neutral control is not performed. | - | U012987
(ECM) |
| Coast Downshift Timing Change According to Air Conditioning Load
·
Delays upshifts according to warm-up request. |
ECM | Air conditioning amplifier assembly | Coast downshift does not occur. | Coast downshift shock reduction performance deteriorates. | - |
| Stop and Start Control
·
Starts and stops the engine using the stop and start control. |
ECM | Engine stop and start ECU assembly | Stop and start control does not operate. | - | U110387
(ECM) |
| Automatic High Beam System
·
High beam light distribution control. |
Forward recognition camera | ·
Main body ECU (multiplex network body ECU) ·
ECM ·
Brake actuator assembly ·
Airbag sensor with ECU assembly ·
Millimeter wave radar sensor assembly |
Performs control based on the signals received before the malfunction occurred. | ·
Automatic high beam indicator (yellow) illuminates. ·
Displays messages on the multi-information display. |
U010087
U012587 U012987 U014087 U023587 (Forward recognition camera) |
| Front Camera Function
·
Sends shared calculations and detection results to each application inside the forward recognition camera. |
Forward recognition camera | ·
Main body ECU (multiplex network body ECU) ·
ECM ·
Brake actuator assembly ·
Airbag sensor with ECU assembly ·
Steering sensor |
Detection is disabled. | - | U010087
U012587 U012687 U012987 U014087 (Forward recognition camera) |
| Lane Tracing Assist system
·
Helps center the vehicle in the lane using lane detection by the forward recognition camera. |
Forward recognition camera | ·
Millimeter wave radar sensor assembly ·
Combination meter assembly ·
ECM ·
Brake actuator assembly ·
Power steering ECU with motor assembly ·
Airbag sensor with ECU assembly ·
Steering sensor |
Control stops. | ·
LTA indicator (yellow) illuminates. ·
Displays messages on the multi-information display. |
U010087
U012587 U012687 U012987 U013187 U015587 U023587 U030051 U030057 (Forward recognition camera) |
| Pre-collision System
·
Performs pre-collision alarm control, pre-collision brake assist control and pre-collision brake control when an obstruction is detected. |
Forward recognition camera | ·
Millimeter wave radar sensor assembly ·
Brake actuator assembly ·
Airbag sensor with ECU assembly ·
Steering sensor ·
ECM |
Pre-collision alarm function, pre-collision brake assist function and pre-collision brake function are canceled. | ·
PCS warning light illuminates. ·
Displays messages on the multi-information display. |
U010087
U012587 U012687 U012987 U023587 U023A87 U030051 U030057 U041881 (Forward recognition camera) |
| Dynamic Radar Cruise Control System
·
Accelerates or decelerates the vehicle to maintain the distance to the vehicle ahead. |
ECM | ·
Brake actuator assembly ·
Forward recognition camera |
Control stops. | Displays messages on the multi-information display. | U010087
U010487 U012287 (ECM) |
| Dynamic Radar Cruise Control System
·
Using the millimeter wave radar sensor, yaw rate sensor, steering sensor, etc., detects the preceding vehicle and maintains a suitable distance by accelerating or braking, and maintains the set vehicle speed when no preceding vehicle is detected. |
Forward recognition camera | ·
Millimeter wave radar sensor assembly ·
Brake actuator assembly ·
Airbag sensor with ECU assembly ·
Steering sensor ·
ECM ·
Combination meter assembly |
Control stops. | Displays messages on the multi-information display. | U010087
U012587 U012687 U012987 U015587 U023587 U110687 (Forward recognition camera) |
| Pre-collision System
·
Performs forward sensing (measured distance) and outputs target information (distance, lateral position, etc.). |
Millimeter wave radar sensor assembly | Forward recognition camera | Sensing (measured distance) is disabled. | Displays messages on the multi-information display. | U010487
(Millimeter wave radar sensor assembly) |
| Power Steering Control
·
Calculates assist current according to torque sensor value and vehicle speed and drives motor. |
Power steering ECU with motor assembly | ·
ECM ·
Brake actuator assembly ·
Airbag sensor with ECU assembly ·
Steering sensor |
Assist force restricted. | EPS warning light illuminates. | U010087
U012987 (Power steering ECU with motor assembly) |
| Assist Map Selection
·
Selects proper assist map according to destination, engine type, etc. |
Power steering ECU with motor assembly | ECM | Default map is used to assist because proper assist map cannot be selected. (Steering feel may be different.) | EPS warning light illuminates. | - |
| Door Lock
·
Controls key linked and automatic door lock/unlock function, key confinement prevention function, etc. |
Main body ECU (multiplex network body ECU) | Airbag sensor with ECU assembly | Key linked door lock/unlock function is performed even when the ignition switch is ON and the driver seatbelt is fastened. | - | U0151
(Main body ECU (multiplex network body ECU)) |
| Shift-linked Automatic Door Lock Function
·
Automatically locks all of the doors when the shift lever is moved to select another shift state with park (P) selected. |
Main body ECU (multiplex network body ECU) | ECM | All of the doors are not locked automatically when all of the following conditions are met.
·
The ignition switch is ON, the engine is running and all of the doors are closed. ·
With park (P) selected, the shift lever is moved to select another shift state. |
- | U0101
(Main body ECU (multiplex network body ECU)) |
| Shift-linked Automatic Door Unlock Function
·
Automatically unlocks all of the doors when the P position switch (transmission shift main switch) is pushed with a shift state other than park (P) selected. |
Main body ECU (multiplex network body ECU) | ·
ECM ·
Combination meter assembly |
All of the doors are not unlocked automatically when all of the following conditions are met.
·
The ignition switch is ON, the engine is running and all of the doors are closed. ·
With other than park (P) selected, the shift lever is moved to select park (P). |
- | U0101
U0155 (Main body ECU (multiplex network body ECU)) |
| Speed-sensitive Automatic Door Lock Function
·
Automatically locks all of the doors when it is determined that the vehicle is being driven. |
Main body ECU (multiplex network body ECU) | Combination meter assembly | All of the doors are not locked automatically when all of the following conditions are met.
·
The ignition switch is ON and the engine is running. ·
Vehicle speed is higher than approximately 20 km/h (12 mph). |
- | U0155
(Main body ECU (multiplex network body ECU)) |
| Manual Unlock Prohibition Function
·
When it is determined that the vehicle is parked and the doors are locked or closed after the driver has left the vehicle, unlocking the vehicle using the door control switch is prohibited. |
Main body ECU (multiplex network body ECU) | ECM | The manual unlock prohibition cannot be canceled when the engine has been started. | - | U0100
(Main body ECU (multiplex network body ECU)) |
| Power Door Lock Control System Customize Setting
·
Enables or disables each power door lock or unlock function in accordance with user operation. |
Main body ECU (multiplex network body ECU) | ECM | ·
Shift linked automatic lock control does not occur. ·
Automatic lock/unlock cannot be changed. |
- | U0100
(Main body ECU (multiplex network body ECU)) |
| Wireless Function
·
Locks and unlocks doors, etc. via remote operation. |
Main body ECU (multiplex network body ECU) | Certification ECU (smart key ECU assembly) | The doors cannot be locked or unlocked via remote operation. | - | U0327
(Main body ECU (multiplex network body ECU)) |
| Entry Lock/Unlock
·
Locks or unlocks doors using the entry lock/unlock operation. |
Main body ECU (multiplex network body ECU) | Certification ECU (smart key ECU assembly) | The doors cannot be locked or unlocked via remote operation. | - | U0327
(Main body ECU (multiplex network body ECU)) |
| Wireless Door Lock Buzzer
·
Sounds when the doors are locked/unlocked by wireless operation. |
Main body ECU (multiplex network body ECU) | Certification ECU (smart key ECU assembly) | The wireless door lock buzzer does not sound when the doors are locked/unlocked by wireless operation. | - | U0327
(Main body ECU (multiplex network body ECU)) |
| Dome Lights
·
Illuminates when approaching any of the doors while holding an entry key. |
Main body ECU (multiplex network body ECU) | Certification ECU (smart key ECU assembly) | The interior lights remain off when the electrical key transmitter sub-assembly is close to any of the doors. | - | U0327
(Main body ECU (multiplex network body ECU)) |
| Dimmer Controlled Illumination
·
Dims the illumination of the instrument panel ambient illumination lights or ambient illumination lights when the vehicle starts driving. |
Main body ECU (multiplex network body ECU) | ECM | The interior lights remain on without being dimmed when the shift state is park (P) and a shift state other than park (P) is selected. | - | U0100
(Main body ECU (multiplex network body ECU)) |
| Alarm Function
·
In the armed state, the alarm function judges break-in according to changes in door courtesy status and the alarm sounds. |
Main body ECU (multiplex network body ECU) | ·
Certification ECU (smart key ECU assembly) ·
ECM |
·
After the vehicle is locked using wireless operation, pressing the push start switch before the alarm is set does not unset the alarm and, after a specified period of time, the alarm will be set. ·
While in the alarm sounding state, the alarm is not canceled when a registered smart key is certified and the push start switch is pressed. ·
When the alarm is sounding, the alarm is not canceled when the engine has been started. |
- | U0100
U0120 U0327 (Main body ECU (multiplex network body ECU)) |
| Battery Saving Function
·
When it is determined that the vehicle is parked, stops sending illumination request signals and cuts power to the interior lights to avoid a depleted battery. |
Main body ECU (multiplex network body ECU) | Certification ECU (smart key ECU assembly) | When the battery is in battery saving mode and any of the doors are approached while holding an entry key, the battery saving function is not canceled and the interior illuminations do not illuminate. | - | U0327
(Main body ECU (multiplex network body ECU)) |
| Interior Light Auto Cut Function
·
Turns off the interior lights automatically when the driver leaves the vehicle with the interior lights illuminated. |
Main body ECU (multiplex network body ECU) | Certification ECU (smart key ECU assembly) | The headlights do not turn off when the lock switch of the electrical key transmitter sub-assembly is pressed with all of the doors locked when the interior light auto cut function is being performed. | - | U0327
(Main body ECU (multiplex network body ECU)) |
| Headlight System Malfunction Warning Display
·
Detects an open circuit or a malfunctioning ECU in the LED headlight system and informs the driver of the malfunction. |
Main body ECU (multiplex network body ECU) | ECM | When an LED headlight malfunction is detected, the LED headlight warning display is not displayed when the low beam headlights are turned on when the engine has been started. | - | U0100
(Main body ECU (multiplex network body ECU)) |
| Meter Illumination Auto Dimmer
·
Determines whether it is daytime or nighttime based on the automatic light control sensor signals and, when it is determined that it is nighttime or dark, dims the meter illumination according to interior light illuminations and tail cancel switch state. |
Main body ECU (multiplex network body ECU) | Combination meter assembly | The meter illumination is dimmed when the tail cancel switch is on. | - | U0155
(Main body ECU (multiplex network body ECU)) |
| Key Off Operation
·
Permits the power window to operate for 43 seconds after the ignition switch is turned off. |
Main body ECU (multiplex network body ECU) | ECM | The engine speed is set to 0. | - | U0100
(Main body ECU (multiplex network body ECU)) |
| Stop and Start System
·
Stops the engine when the vehicle is stationary. |
Engine stop and start ECU | ·
Air conditioning amplifier assembly ·
ECM ·
Power steering ECU with motor assembly ·
Main body ECU (multiplex network body ECU) ·
Airbag sensor with ECU assembly ·
Brake actuator assembly ·
Steering sensor |
·
When driving in eco drive mode, the engine starts. ·
When not driving in eco drive mode, eco drive cannot be performed. |
Stop and start cancel indicator light blinks. | U010087
U012687 U012987 U013187 U014087 U015187 U016487 (Engine stop and start ECU) |