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) |
|---|---|---|---|---|---|
| Air Conditioning Control
|
Air conditioning amplifier assembly | ECM |
|
- | - |
| Air Conditioning Control
|
Air conditioning amplifier assembly | ECM | Control is performed based on default engine speed of 0 rpm. | - | [Air conditioning amplifier assembly] U0100 |
| Air Conditioning Control
|
Air conditioning amplifier assembly | Power steering ECU assembly | No load control (regular control). | - | [Air conditioning amplifier assembly] U0131 |
| Air Conditioning Control
|
Air conditioning amplifier assembly | Hybrid vehicle control ECU | Maintains same condition (Controls using default value (ECO display off) when not determined). | - | - |
| Air Conditioning Control
|
Air conditioning amplifier assembly | Main body ECU (multiplex network body ECU) | Maintains same condition (Controls using default value when not determined). | - | [Air conditioning amplifier assembly] U0142 |
| Air Conditioning Control
|
Air conditioning amplifier assembly | Combination meter sub-assembly |
|
- | [Air conditioning amplifier assembly] U0155 |
| Air Conditioning Control
|
Air conditioning amplifier assembly | Hybrid vehicle control ECU | Maintains the same state. (When not determined, control is performed based on a default setting of off.) | - | [Air conditioning amplifier assembly] U0293 |
| Air Conditioning Control
|
Air conditioning amplifier assembly | Hybrid vehicle control ECU | Air conditioning cooling operation is stopped. | - | [Hybrid vehicle control ECU] U0164 |
| ECO Navigation Display
|
|
|
|
- | [Navigation receiver assembly] U0100 U0129 U0155 U0293 [Radio and display receiver assembly] U0100 U0129 U0155 U0293 |
| Energy Monitor Display
|
|
Hybrid vehicle control ECU | If communication stops while the energy flow screen is displayed, the energy flow display disappears and the latest value is maintained for the SOC (state of charge) level display. | - | [Navigation receiver assembly] U0293 [Radio and display receiver assembly] U0293 |
| Rear View Monitor Control
|
|
|
Screen does not change to image from camera when reverse (R) has been selected. | Screen does not change to image from camera when reverse (R) has been selected. | [Navigation receiver assembly] U0100 [Radio and display receiver assembly] U0100 |
| Destination Identification
|
|
Main body ECU (multiplex network body ECU) | Destination is identified based on the latest value (based on the default value if data has never been received) and operation continues. | Time zone and language selection screen are different from actual destination. | [Navigation receiver assembly] U0140 [Radio and display receiver assembly] U0140 |
| Vehicle Customization Function
|
|
|
- | - | - |
| Time Stamp Function
|
Navigation receiver assembly | Main body ECU (multiplex network body ECU) | - | - | [Navigation receiver assembly] U0073 |
| Daytime Running Light Control
|
Main body ECU (multiplex network body ECU) |
|
Daytime running light control does not operate. | - | [Main body ECU (multiplex network body ECU)] U0100 U0293 |
| Display Automatic Dimming Control
|
Main body ECU (multiplex network body ECU) | Combination meter sub-assembly | Automatic dimming control for displays is performed when taillights are turned on. | - | [Main body ECU (multiplex network body ECU)] U0155 |
| Door Lock
|
Main body ECU (multiplex network body ECU) | Airbag ECU assembly | Key linked operation is permitted. | - | [Main body ECU (multiplex network body ECU)] U0151 |
| Key Confinement Prevention Control
|
Main body ECU (multiplex network body ECU) | Combination meter sub-assembly | Key confinement prevention unlock operation is permitted. | - | [Main body ECU (multiplex network body ECU)] U0155 |
| Back Door Opener
|
Main body ECU (multiplex network body ECU) | Combination meter sub-assembly | Back door open control is prohibited. | - | [Main body ECU (multiplex network body ECU)] U0155 |
| Illumination Control
|
Main body ECU (multiplex network body ECU) | Certification ECU (smart key ECU assembly) | Interior light illumination control does not operate when the smart key is brought near the vehicle. | - | [Main body ECU (multiplex network body ECU)] U0327 |
| Footwell Illumination
|
Main body ECU (multiplex network body ECU) |
|
|
- | [Main body ECU (multiplex network body ECU)] U0101 U0155 |
| Alarm
|
Main body ECU (multiplex network body ECU) |
|
|
- | [Main body ECU (multiplex network body ECU)] U0100 U0120 U0293 |
| LED Headlight Warning Control
|
Main body ECU (multiplex network body ECU) | Hybrid vehicle control ECU | LED headlight malfunctions cannot be detected. | - | [Main body ECU (multiplex network body ECU)] U0293 |
| Entry Function
|
|
Combination meter sub-assembly |
|
- | [Certification ECU (smart key ECU assembly)] U0142 U0155 [Main body ECU (multiplex network body ECU)] U0327 |
| Wireless Function
|
Main body ECU (multiplex network body ECU) | Certification ECU (smart key ECU assembly) | Wireless lock/unlock and panic functions do not operate. | - | [Certification ECU (smart key ECU assembly)] U0142 |
| ABS Control
|
Brake booster with master cylinder assembly (skid control ECU) | Airbag ECU assembly |
|
|
[Brake booster with master cylinder assembly (skid control ECU)] U0073 U0123 U0124 |
| VSC/TRC Control
|
Brake booster with master cylinder assembly (skid control ECU) |
|
|
|
[Brake booster with master cylinder assembly (skid control ECU)] U0073 U0123 U0124 U0126 U0293 |
| Hill-start Assist Control
|
Brake booster with master cylinder assembly (skid control ECU) |
|
|
|
[Brake booster with master cylinder assembly (skid control ECU)] U0073 U0123 U0124 U0126 U0293 |
| Hybrid Regenerative Operation
|
Brake booster with master cylinder assembly (skid control ECU) |
|
|
|
[Brake booster with master cylinder assembly (skid control ECU)] U0073 U0120 U0123 U0124 U0293 |
| Steering Assist Calculation
|
Power steering ECU assembly | Brake booster with master cylinder assembly (skid control ECU) | Assist force restricted. | EPS warning light illuminates. | [Power steering ECU assembly] U0129 |
| Steering Assist Start Judgment
|
Power steering ECU assembly | Hybrid vehicle control ECU | Steering assist start is not judged while cranking but is judged when the engine starts idling. | EPS warning light illuminates. | [Power steering ECU assembly] U0129 |
| Steering Assist Map Selection
|
Power steering ECU assembly | Hybrid vehicle control ECU | Default assist map is used because proper assist map cannot be selected. | - | - |
| Steering/Steering Angle Sensor Initialization and Zero Point Learning
|
Power steering ECU assembly |
|
Steering initialization and zero point learning are not performed. | EPS warning light illuminates. | [Power steering ECU assembly] U0129 |
| Steering Assist Compensation Control
|
Power steering ECU assembly | Brake booster with master cylinder assembly (skid control ECU) | Assist force restricted. | EPS warning light illuminates. | [Power steering ECU assembly] U0129 |
| Power Switch Backlighting Control
|
Certification ECU (smart key ECU assembly) |
|
|
- | [Certification ECU (smart key ECU assembly)] U0142 U0155 |
| Vehicle Speed Display
|
Combination meter sub-assembly | Brake booster with master cylinder assembly (skid control ECU) | Control is performed based on signal value of 0. | Drive monitor calculation is stopped. | [Combination meter sub-assembly] U0129 |
| Buzzer
|
Combination meter sub-assembly |
|
Buzzer stops sounding or does not sound. | - | - |
| Meter Display
|
Combination meter sub-assembly |
|
Lights do not illuminate or lights remain illuminated. | Abnormal light operation. | [Combination meter sub-assembly] U0100 U0129 U0131 U0142 U0151 U023A U1104 |
| Multi-information Display
|
Combination meter sub-assembly |
|
|
- | [Combination meter sub-assembly] U0100 U0129 U0131 U0142 U023A U1104 |
| Shift state information display after turning the power switch off
|
Transmission control ECU assembly |
|
None | - | [Transmission control ECU assembly] U0146 |
| P Position Switch Indicator Light Display Function
|
Transmission control ECU assembly | Main body ECU (multiplex network body ECU) | None | - | [Transmission control ECU assembly] U0146 |
| Shift State Information After Turning The Power Switch Off
|
Transmission control ECU assembly | Main body ECU (multiplex network body ECU) | None | - | [Transmission control ECU assembly] U0146 |
| Parking Lock System Warning Message
|
Transmission control ECU assembly | Main body ECU (multiplex network body ECU) | None | - | [Transmission control ECU assembly] U0146 |
| P Control DTC Detection
|
Transmission control ECU assembly | Main body ECU (multiplex network body ECU) | None | - | [Transmission control ECU assembly] U0146 |
| P Control CPU Sleep Control | Transmission control ECU assembly | Main body ECU (multiplex network body ECU) | IG off state cannot be judged using CAN data. | - | [Transmission control ECU assembly] U0146 |
| P Position Switch Indicator Light Dimmer Control
|
Transmission control ECU assembly | Main body ECU (multiplex network body ECU) | None | - | [Transmission control ECU assembly] U0146 |
| Drive Torque Control
|
Hybrid vehicle control ECU | ECM | Vehicle drives using only the motor. | HV system warning light turns on. | [Hybrid vehicle control ECU] U0100 |
| Regenerative Cooperative Control
|
Hybrid vehicle control ECU | Brake booster with master cylinder assembly (skid control ECU) | Regeneration is not performed. | HV system warning light turns on. | [Hybrid vehicle control ECU] U0129 |
| High voltage shut off control when the vehicle is damaged
|
Hybrid vehicle control ECU | Airbag ECU assembly | Normal driving. | HV system warning light turns on. | [Hybrid vehicle control ECU] U0151 |
| HV System Power Processing
|
Hybrid vehicle control ECU | - | Normal driving. | HV system warning light turns on. | [Hybrid vehicle control ECU] U1107 |
| Automatic P Control
|
Hybrid vehicle control ECU | Transmission control ECU assembly | Normal driving. | HV system warning light turns on. | [Hybrid vehicle control ECU] U1107 |
| DTC Determination Time Record
|
Hybrid vehicle control ECU | Main body ECU (multiplex network body ECU) | Normal driving. | HV system warning light turns on. | [Hybrid vehicle control ECU] U0140 |
| Driver Door Open Warning
|
Hybrid vehicle control ECU |
|
Normal driving. | HV system warning light turns on. | [Hybrid vehicle control ECU] U0140 |
| Power Switch (Power Source Control)
|
Certification ECU (smart key ECU assembly) |
|
Remote engine start does not operate. | - | [Certification ECU (smart key ECU assembly)] U0103 U0129 U0140 U0293 |
| Steering Sensor
|
Spiral cable with sensor sub-assembly (steering angle sensor) | Brake booster with master cylinder assembly (skid control ECU) | None | Slip warning light turns on. | - |
| Dynamic Radar Cruise Control System
|
Driving support ECU assembly |
|
Dynamic radar cruise control system does not operate. |
|
[Driving support ECU assembly] U0125 U0126 U0129 U0235 U0293 U1104 |
| Pre-crash Safety System
|
Driving support ECU assembly |
|
Pre-crash safety system does not operate. |
|
[Driving support ECU assembly] U0125 U0126 U0129 U0235 U023A U0293 U1104 |
| Intelligent Parking Assist System
|
Parking assist ECU |
|
|
|
[Parking assist ECU] U0073 U0100 U0126 U0129 U0131 U0140 U0293 U1000 [Power steering ECU assembly] U1105 |
| Pre-crash Safety System
|
Forward recognition camera |
|
Pre-crash safety system does not operate. |
|
[Forward recognition camera] U0123 U0129 U0142 U0235 U0293 |
| LKA/LDA/SWS System (Recognizes the lane markers of the lane the vehicle is in using the forward recognition camera and performs the following operations based on the vehicle condition and information captured by the forward recognition camera.)
|
Forward recognition camera |
|
Lane departure alert system control stops. |
|
[Forward recognition camera] U0101 U0123 U0126 U0129 U0131 U0142 U0155 U0235 U0293 U023A U1104 |
| Automatic High Beam System
|
Forward recognition camera |
|
Maintains the same condition. | Displays messages on the multi-information display. | [Forward recognition camera] U0101 U0123 U0129 U0142 U0235 U0293 |
| Road Sign Assist Function
|
Forward recognition camera |
|
Road sign assist function is canceled. |
|
[Forward recognition camera] U0101 U0123 U0129 U0142 U0155 U0293 |