FAIL-SAFE FUNCTION
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.
The table below shows the effects on each system when communication is impossible. For further details, refer to each system.
| System | Function |
|
Fail-safe Function System Behavior | Indicator and Buzzer Behavior or User Notification | Diagnosis Code [Diagnosis Code Hold Condition] |
|---|---|---|---|---|---|
| ECD | Electrical load control (Increases idle speed according to electrical load.) |
|
The idle speed increase due to electrical load is not performed. | Nothing | Nothing [-] |
| Air conditioner-linked control (Idle speed increased according to compressor load.) |
|
Air conditioner-linked control does not operate. | Nothing | Nothing [-] |
|
| PTC heater (Increases idle speed according to requests from the PTC heater or the heater system.) |
|
PTC heater does not operate. | Nothing | Nothing [-] |
|
| Charging control (Increases idle speed according to charging requests.) |
|
The idle speed increase according to charging requests is not performed. | Nothing | Nothing [-] |
|
| ECD system indicator (Estimates the deterioration of the oil and displays a prompt to change oil on the meter.) |
|
Indicator does not illuminate. | Nothing | Nothing [-] |
|
| ECT system indicators (Indicators indicating shift position, states of switches, system modes, etc.) |
|
Indicator does not illuminate. | Nothing | Nothing [-] |
|
| Spring vibration damping control (Behavior of the spring due to outside disturbances (pitch and bounce) is improved with transient driving force control.) |
|
Behavior of the spring due to outside disturbances (pitch and bounce) is not improved with transient driving force control. | Nothing | Nothing [-] |
|
| Neutral control (The engine load is reduced, and the idle speed is increased.) |
|
Neutral control does not operate. | Nothing | Nothing [-] |
|
| Integrated control (Improvement of stable constant-speed drivability, starting ability, repeated acceleration and feeling of acceleration is achieved by estimating the required torque from the operation of the accelerator pedal and performing torque control according to the driving situation.) |
|
Estimation of the required torque from the operation of the accelerator pedal, and torque control according to the driving situation are not performed. As a result, improvement of the following is not achieved: stable constant-speed drivability, starting ability, repeated acceleration and feeling of acceleration. | Nothing | Nothing [-] |
|
| ECD | Eco driving indicator (Informs the driver about ECO-driving status.) |
|
Indicator is turned off. | Nothing | Nothing [-] |
| Cruise Control (Adjusts the engine throttle valve opening amount automatically to control the vehicle.) |
|
ACC control is canceled. | CRUISE main indicator light blinks. | Nothing [-] |
|
| Air conditioning | Air conditioning compressor control
|
|
Air conditioning compressor does not operate. | Nothing | U0100 [Stored until the DTC is cleared with the intelligent tester.] |
| Steering wheel position/destination determination control
|
|
|
Nothing | U0142 [Stored until the DTC is cleared with the intelligent tester.] |
|
| Air conditioning | Ambient temperature control
|
|
Air conditioning does not function properly (temperature control is not possible). | Nothing | U0155 [Stored until the DTC is cleared with the intelligent tester.] |
| Simple load control (Cuts the air conditioning load based on the signal from power steering ECU assembly.) |
|
Simple load control cannot be performed. | Nothing | U0131 [Stored until the DTC is cleared with the intelligent tester.] |
|
| Airbag | Fuel-cut |
|
Airbag operating properly. | Nothing | Nothing [-] |
| SRS warning light control |
|
Airbag operating properly. | Nothing | Nothing [-] |
|
| Event data recorder |
|
Airbag system operating 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.) |
|
- | PARK warning light turns on. | U0129 [Stored until the DTC is cleared with the intelligent tester.] |
| Dynamic braking function (This function decelerates the vehicle during driving using the parking brake.) |
|
Dynamic braking function is disabled. Static braking function operates even when the vehicle is being driven. | PARK warning light turns on. | U0129 [Stored until the DTC is cleared with the intelligent tester.] |
|
| Electric parking brake | Automatic disengagement function (This function disengages the parking brake automatically when the vehicle begins driving while the parking brake is engaged [for Manual Transaxle].) |
|
Drive away release (DAR) is disabled. | PARK warning light turns on. | U0129 [Stored until the DTC is cleared with the intelligent tester.] |
|
Drive away release (DAR) is disabled. | PARK warning light turns on. | U0124 [Stored until the DTC is cleared with the intelligent tester.] |
||
|
Drive away release (DAR) is disabled. | PARK warning light turns on. | U0100 [Stored until the DTC is cleared with the intelligent tester.] |
||
| Meter/gauge | Speedometer |
|
- | 0 km/h (0 mph) is displayed. | U0129 [Stored until the DTC is cleared with the intelligent tester.] |
| Tachometer |
|
- | 0 rpm is displayed. | U0100 [Stored until the DTC is cleared with the intelligent tester.] |
|
| Coolant temperature gauge |
|
- | LCD segments turn off. | Nothing [-] |
|
| Fuel gauge |
|
- | Control is performed with the following conditions set as below:
|
B1500 [Only stored as a current DTC. Stored until cleared with the intelligent tester.] |
|
| Meter/gauge | ODO/TRIP meter |
|
- | Calculation stops and the last displayed value remains. | Nothing [-] |
| A/T shift indicator |
|
- | Turns off. | Nothing [-] |
|
| SRS warning light |
|
- | Turns on until the ignition switch is turned off. | Nothing [-] |
|
| ABS warning light |
|
- | Turns on until the ignition switch is turned off. | Nothing [-] |
|
| Brake system warning light (yellow indicator) |
|
- | Turns on until the ignition switch is turned off. | Nothing [-] |
|
| SLIP indicator light |
|
- | Current status is maintained until the ignition switch is turned off. | Nothing [-] |
|
| AFS OFF indicator light |
|
- | Current status is maintained until the ignition switch is turned off. | Nothing [-] |
|
| BEAM indicator light |
|
- | Current status is maintained while the ignition switch is ON and turns off when the ignition switch is turned off. | Nothing [-] |
|
| Meter/gauge | TAIL indicator light |
|
- | Current status is maintained while the ignition switch is ON and turns off when the ignition switch is turned off. | Nothing [-] |
| Rr FOG indicator light |
|
- | Current status is maintained while the ignition switch is ON and turns off when the ignition switch is turned off. | Nothing [-] |
|
| Fr FOG indicator light |
|
- | Current status is maintained while the ignition switch is ON and turns off when the ignition switch is turned off. | Nothing [-] |
|
| Driver side seat belt warning light |
|
- | Current status is maintained while the ignition switch is ON and turns off when the ignition switch is turned off. | Nothing [-] |
|
| Front passenger side seat belt warning light |
|
- | Current status is maintained while the ignition switch is ON and turns off when the ignition switch is turned off. | Nothing [-] |
|
| EPS indicator light |
|
- | Turns on until ignition switch is turned off. | Nothing [-] |
|
| SPORT indicator light |
|
- | Current status is maintained while the ignition switch is ON. | Nothing [-] |
|
| SIL indicator light |
|
- | Turns off. | Nothing [-] |
|
| CHARGE warning light |
|
- | Current status is maintained until the ignition switch is turned off. | Nothing [-] |
|
| Meter/gauge | GLOW warning light |
|
- | Current status is maintained until the ignition switch is turned off. | Nothing [-] |
| ECO indicator light |
|
- | Turns off. | Nothing [-] |
|
|
|
- | Current status is maintained until the ignition switch is turned off. | Nothing [-] |
|
| ASL indicator light |
|
- | Current status is maintained until the ignition switch is turned off. | Nothing [-] |
|
| PCS indicator light |
|
- | Current status is maintained until the ignition switch is turned off. | Nothing [-] |
|
| LKA indicator light |
|
- | Current status is maintained until the ignition switch is turned off. | Nothing [-] |
|
| Seat belt reminder buzzer |
|
- | Control is performed with the following conditions set as below:
|
Nothing [-] |
|
| Driving with open door buzzer |
|
- | Control is performed with the following conditions set as below:
|
Nothing [-] |
|
| Meter/gauge | Sliding roof buzzer |
|
- | Status is maintained until BUS-sleep mode. | Nothing [-] |
| Entry and start buzzer (Continuous, intermittent and single) |
|
- |
|
Nothing [-] |
|
| Immobiliser key buzzer |
|
- | Same as the state indicated by the last received signal. | Nothing [-] |
|
| Key reminder buzzer |
|
- | Does not sound. | Nothing [-] |
|
| Light reminder buzzer |
|
- | Does not sound. | Nothing [-] |
|
| Driving with parking brake applied buzzer |
|
- | Control is performed with the vehicle speed set to 0 km/h (0 mph). | Nothing [-] |
|
| Radar cruise low speed cancel buzzer |
|
- | Current status is maintained until the ignition switch is turned off. | Nothing [-] |
|
| Shift reject buzzer |
|
- | Current status is maintained until the ignition switch is turned off. | Nothing [-] |
|
| Meter/gauge | LKA buzzer (Double) |
|
- | Current status is maintained until the ignition switch is turned off. | Nothing [-] |
| DTC |
|
- | Switches to normal mode. | Nothing [-] |
|
| On-board computer |
|
- |
|
Nothing [-] |
|
| Meter/gauge | Multi-display ACC, LKA and ASL operation |
|
- | Turns off. | Nothing [-] |
| Multi-display ACC, LKA and ASL warning |
|
- | Current status is maintained while the ignition switch is ON and turns off when the ignition switch is turned off. | Nothing [-] |
|
| Multi-display PCS |
|
- | Current status is maintained while the ignition switch is ON and turns off when the ignition switch is turned off. | Nothing [-] |
|
| Multi-display rear seat belt |
|
- | Control is performed with the following conditions set as below:
|
Nothing [-] |
|
| Multi-display VSC |
|
- | Turns on. | Nothing [-] |
|
| Multi-display OIL pressure |
|
- |
|
Nothing [-] |
|
| Meter/gauge | Multi-display DOOR |
|
- | Current status is maintained while the ignition switch is ON and turns off when the ignition switch is turned off. | Nothing [-] |
| Multi-display entry and start and power management |
|
- | Current status is maintained while the ignition switch is ON and turns off when the ignition switch is turned off. | Nothing [-] |
|
| Multi-display image when driving with parking brake applied |
|
- | The "CHECK PARKING BRAKE SYSTEM" multi-display displayed | Nothing [-] |
|
| Multi-display OIL LEVEL |
|
- | Control is performed with the engine coolant temperature set to 80°C (176°F) or higher. | Nothing [-] |
|
| Multi-display OIL MAINTENANCE |
|
- | Turns on while the ignition switch is ON. | Nothing [-] |
|
| Multi-display LIGHT reminder |
|
- | Turns off. | Nothing [-] |
|
| Multi-display T/M oil temperature |
|
- | Control is performed with the following conditions set as below:
|
Nothing [-] |
|
| Multi-display STOP light |
|
- | Current status is maintained until the ignition switch is turned to ON. | Nothing [-] |
|
| 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.) |
|
The system does not display the starting prompt "Depress the brake pedal when starting" when it should. | Nothing | U0100 [Stored until the DTC is cleared with the intelligent tester.] |
| Entry and start | Entry and start function (Entry and start lock, unlock, trunk and warning functions) |
|
|
Nothing | Nothing [-] |
| Wireless function (Wireless lock, unlock and panic system) |
|
Wireless functions (wireless lock, unlock and panic system) do not operate. | Nothing | Nothing [-] |
|
| Ignition switch lighting function (Controls ignition switch illumination) |
|
|
Nothing | 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.) |
|
|
Nothing | 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.) |
|
Auto lock control does not operate. | Nothing | Nothing [-] |
|
| Daytime running lights (DRL) control (This system controls the daytime running lights when it determines that the vehicle is being driven.) |
|
DRL control does not operate. | Nothing | Nothing [-] |
|
| Manual memory function (A system which memorizes and recalls the positions of the seat, mirrors and steering wheel.) |
|
Memory function operation is prohibited. | Nothing | U0208 U1115 [Stored until the DTC is cleared with the intelligent tester.] |
|
| Driving support ECU assembly | Dynamic radar cruise control (Speed control when following the vehicle in front.) |
|
Dynamic radar cruise control system does not operate. | CRUISE indicator blinks and the buzzer sounds (ACC control only). | Nothing [-] |
| Pre-crash safety system (Performs control of the seat belts and brakes before a collision.) |
|
Pre-crash safety system does not operate. | Warning screens related to the pre-crash safety system are displayed on the multi-information display. |
[Stored until the DTC is cleared with the intelligent tester.] |
|
| Lane-keeping assist system (Controls the steering assist by following the lane markers.) |
|
Lane-keeping assist system control does not operate. | LKA indicator illuminates and the buzzer sounds (during LKA control only). |
[Stored until the DTC is cleared with the intelligent tester.] |
|
| Vehicle stability control | VSC, ABS and TRC |
|
VSC and TRC operation prohibited. | VSC and SLIP indicator lights illuminate. |
[Stored until the DTC is cleared with the intelligent tester.] |
| Pre-crash safety system (Requests seat belt activation when the vehicle condition is unstable.) |
|
Pre-crash safety system does not operate correctly. | VSC and SLIP indicator lights illuminate. | Nothing [-] |
|
| S-VSC |
|
No steering intervention during VSC actuator. | VSC and SLIP indicator lights illuminate. | Nothing [-] |
|
| Pre-crash safety | PCS Operation Condition 1 (Tightens the seat belts to increase occupant restraint when the vehicle brakes are applied abruptly or when the vehicle is out of control (spinning or drifting).) |
|
Control stops. | PCS indicator illuminates |
Current DTCS stored until power is turned off or until DTC is cleared with intelligent tester by sending a DTC clear signal (past DTCs can be cleared by sending a signal to clear DTCs using the intelligent tester). |
| PCS Operation Condition 2 (Tightens the seat belts to increase occupant restraint when the DSS1 determines that a collision is unavoidable based on information from the millimeter wave radar sensor.) |
|
Control stops. | PCS indicator illuminates |
Current DTCS stored until power is turned off or until DTC is cleared with intelligent tester by sending a DTC clear signal (past DTCs can be cleared by sending a signal to clear DTCs using the intelligent tester). |
|
| 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.) |
|
AFS operates normally. | AFS OFF indicator blinks. | U0142 [Stored until the DTC is cleared with the intelligent tester.] |
|
Lights are instructed to return to the front-facing position. | AFS OFF indicator blinks. |
[Stored until the DTC is cleared with the intelligent tester.] |
||
| 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.) |
|
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. |
|
U0100 [Stored until the DTC is cleared with the intelligent tester.] |
|
Temporary control is performed with the vehicle speed set to 100 km/h (62 mph). | EPS indicator illuminates. | U0129 [Stored until the DTC is cleared with the intelligent tester.] |
||
| αB control (Helps prevent the vehicle from drifting.) |
|
αB control is canceled
|
EPS indicator illuminates. | U0129 [Stored until the DTC is cleared with the intelligent tester.] |
|
| Lane-keeping assist system (Performs assist by converting the target steering torque from the driving support ECU into the target torque for the electronic power steering system.) |
|
LKA control is prohibited. | Nothing | U0104 [Stored until the DTC is cleared with the intelligent tester.] |
|
| Driver seat | Memory recall function (Function to recall recorded positions according to the switch operation.) |
|
Recall function does not operate. | Nothing | Nothing [-] |
| Memory function |
|
Recall function does not operate. | Nothing | Nothing [-] |
|
| Tilt and Telescopic | Memory and recall control (Controls the memorization of the steering wheel tilt and telescopic positions and operates the steering wheel tilt and telescopic function according to the seat position memory.) |
|
Memory and recall functions do not operate. | Nothing | B2621
|
| Auto away/return control (Controls the auto away/return functions according to the KCC and IG signals.) |
|
Auto away/return function does not operate. | Nothing | B2621
|
|
| Auto prohibition function (Prohibits automatic control during driving according to the vehicle speed signal.) |
|
Auto away/return function does not operate. | Nothing | B2624
|
|
| Operation permission when parked (Permits operation when the vehicle is parked.) |
|
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).) |
|
|
Nothing |
[Stored until the DTC is cleared with the intelligent tester.] |
| Destination Determination (Determines the destination of the vehicle and selects the display language, time zone, etc. based on destination symbols, destination package information, etc.) |
|
The time zone and language selection screens do not match the destination. | Nothing | U0140 [Stored until the DTC is cleared with the intelligent tester.] |
|
| Vehicle Customize Function (Changes the behavior and control parameters of various functions (illumination lighting time, etc.) according to user operation via the screen.) |
|
Customize functions related to ACN/BDB/IDT/ DST/TAT ECU are not displayed, or changes to their values are not indicated. | Nothing |
[Stored until the DTC is cleared with the intelligent tester.] |