Fail-Safe Chart

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.

FAIL-SAFE OPERATION CHART

Function (Function Description)	Control Master	System Related	Control Actuator	Fail-safe Operation	Driver Detectable
Lighting (Dimmer switch is in AUTO position)	Main Body ECU (MS bus)	Main Body ECU (MS bus) Combination Switch	Main Body ECU (MS bus) Front Controller Rear Junction Block ECU	Dimmer switch AUTO position is maintained	None
Lighting (Taillight, headlight, high beam light, front fog light, rear fog light, cornering light, license plate light, side marker light)	Main Body ECU (MS bus)	Main Body ECU (MS bus) Combination Switch	Main Body ECU (MS bus) Front Controller Rear Junction Block ECU	Light turns OFF However, headlight illumination is possible as they are connected by direct line	None
Back-up light control	ECM (V bus)	ECM (V bus)	Rear Junction Block ECU	When back-up light is on, it turns OFF	None
DRL control	Main Body ECU (MS bus)	Main Body ECU (MS bus)	Front Controller	When driving: remains illuminated Stopped condition → driving condition: turns OFF	None
Headlight cleaner alternative output	Main Body ECU (MS bus)	Main Body ECU (MS bus) Front Controller	-	Output OFF	None
Illumination control Dome light Center console light Foot area illumination Steering switch illumination Driver side module switch illumination Luggage room illumination Buckle switch illumination	Main Body ECU (MS bus)	Main Body ECU (MS bus) Certification ECU Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH Rear Multiplex Network Door ECU LH Rear Multiplex Network Door ECU RH Combination Switch Steering Pad ECU Outer Mirror Switch	Main Body ECU (MS bus) Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH Rear Multiplex Network Door ECU LH Rear Multiplex Network Door ECU RH Steering Pad ECU Outer Mirror Switch Rear Junction Block ECU Rear Power Seat Module Switch	Illumination (room light) control does not operate (conditions below apply) During IDT communication stop: If malfunction occurs when touch sensor is operating, after illumination control's timer illumination time elapses, illumination control turns OFF During DRD, DRP, DRR and DRL communication stop: If door unlock position cannot be received, illumination control is not possible	None
Door lock/unlock	Main Body ECU (MS bus)	ECM (V bus) Main Body ECU (MS bus) Certification ECU Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH Rear Multiplex Network Door ECU LH Rear Multiplex Network Door ECU RH Bus Buffer ECU	Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH Rear Multiplex Network Door ECU LH Rear Multiplex Network Door ECU RH	IDT, DRD, DRP, DRR, DRL and CBG communication stop: Wireless, smart, remote, key-linked/LEXUS link, and other systems' various door lock control operations are not possible	None
Door lock (Double lock control)	Main Body ECU (MS bus)	Certification ECU Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH Rear Multiplex Network Door ECU LH Rear Multiplex Network Door ECU RH	Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH Rear Multiplex Network Door ECU LH Rear Multiplex Network Door ECU RH	Double lock does not operate	None
Entry lock/unlock	Certification ECU	Main Body ECU (MS bus) Certification ECU Front controller Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH Rear Multiplex Network Door ECU LH Rear Multiplex Network Door ECU RH	Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH Rear Multiplex Network Door ECU LH Rear Multiplex Network Door ECU RH	Entry lock/unlock not possible	None
Entry luggage compartment	Certification ECU	Main Body ECU (MS bus) Certification ECU Front Controller Rear Junction Block ECU Power Trunk Lid Control ECU	Rear Junction Block ECU Power Trunk Lid Control ECU	Entry luggage compartment lock/unlock not possible	None
Warning function	Certification ECU	Main Body ECU (MS bus) No. 1 Meter ECU (MS bus) Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH Rear Multiplex Network Door ECU LH Rear Multiplex Network Door ECU RH	-	Warning buzzer not possible	None
Alarm	Certification ECU	Main Body ECU (MS bus) Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH Rear Multiplex Network Door ECU LH Rear Multiplex Network Door ECU RH Rear Junction Block ECU Power Trunk Lid Control ECU	Front Controller	Alarm not possible	None
Immobilizer	Certification ECU	Main Body ECU (MS bus) Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH Rear Multiplex Network Door ECU LH Rear Multiplex Network Door ECU RH	-	Immobilizer operation not possible	None
Security	Certification ECU	Main Body ECU (MS bus) Front Controller Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH Rear Multiplex Network Door ECU LH Rear Multiplex Network Door ECU RH Rear Junction Block ECU Power Trunk Lid Control ECU	-	Security set not possible	None
Power window (key-linked power window control)	Main Body ECU (MS bus)	Front Multiplex Network Door ECU LH	-	During key-linked power window operation, after fail-safe time elapses, power window operation stops	None
Door closer	Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH Rear Multiplex Network Door ECU LH Rear Multiplex Network Door ECU RH	Main Body ECU (MS bus) Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH	Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH Rear Multiplex Network Door ECU LH Rear Multiplex Network Door ECU RH	Door closer function stops (if door closer is operating, operation continues until it is finished, then function stops)	None
Trunk operation (without PTL)	Rear Junction Block ECU	ECM (V bus) Main Body ECU (MS bus) No. 1 Meter ECU (MS bus) Certification ECU Rear Junction Block ECU	Rear Junction Block ECU	Luggage compartment door closer operation is not possible (only operation with mechanical key is possible)	None
Power trunk lid open/close (electric)	Power Trunk Lid Control ECU	ECM (V bus) Main Body ECU (MS bus) No. 1 Meter ECU (MS bus) Certification ECU Rear Junction Block ECU Power Trunk Lid Control ECU	Power Trunk Lid Control ECU	Power trunk lid operation not possible (only operation with mechanical key is possible)	None
Mirror surface memory/call	Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH	Main Body ECU (MS bus) Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH Front Power Seat ECU and Switch LH Outer Mirror Switch	Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH	Memory and call not possible	None
Mirror surface alignment	Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH	Outer Mirror Switch	Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH	Adjustment not possible	None
Mirror retract/Return	Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH	Outer Mirror Switch	Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH	Retract and return impossible	None
Mirror reverse-linked	Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH	ECM (V bus) Main Body ECU (MS bus)	Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH	Reverse-linked operation impossible	None
Mirror heater	Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH	Air Conditioning Amplifier Electric Power Control ECU	Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH	During ACN communication stop, mirror heater does not operate (operates during electric power control ECU communication stop)	None
Foot area illumination	Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH	ECM (V bus) Main Body ECU (MS bus) Certification ECU	Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH	During IDT communication stop: If malfunction occurs when person sensor is operating, after foot area illumination control's timer illumination time elapses, foot area illumination turns OFF	None
Driver seat memory	Front Power Seat ECU and Switch LH	ECM (V bus) Main Body ECU (MS bus) No. 1 Meter ECU (MS bus) Certification ECU Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH Front Power Seat ECU and Switch LH Multiplex tilt and Telescopic ECU Rear Junction Block ECU	Front Power Seat ECU and Switch LH	Driver side seat memory operation stops, or does not operate	None
Passenger seat memory	Front Power Seat ECU and Switch RH	ECM (V bus) Main Body ECU (MS bus) No. 1 Meter ECU (MS bus) Front Multiplex Network Door ECU RH Front Power Seat ECU and Switch RH Rear Junction Block ECU	Front Power Seat ECU and Switch RH	Passenger side seat memory operation stops, or does not operate	None
Passenger seat full front return	Front Power Seat ECU and Switch RH	Center Airbag Sensor Main Body ECU (MS bus) Front Power Seat ECU and Switch RH Rear Junction Block ECU Rear Power Seat Module Switch	Front Power Seat ECU and Switch RH	During BDB or RRJ communication stop: Passenger side full front operation stops, or does not operate During RCN communication stop: slide, reclining and manual operation toward rear is possible	RCN: Warning buzzer sounds during rear seat slide, reclining and manual operation
Passenger side rear ottoman seat	Front Power Seat ECU and Switch RH	Center Airbag Sensor Main Body ECU (MS bus) Front Power Seat ECU and Switch RH Rear Junction Block ECU Rear Power Seat Module Switch	Front Power Seat ECU and Switch RH	During BDB or RRJ communication stop: Passenger side full front operation stops, or does not operate During RCN communication stop: slide, reclining and manual operation toward rear is possible	RCN: Warning buzzer sounds during rear seat slide, reclining and manual operation
Rear seat memory	Rear Power Seat Module Switch	Main Body ECU (MS bus) Rear Multiplex Network Door ECU LH Rear Multiplex Network Door ECU RH Front Power Seat ECU and Switch RH Rear Power Seat Module Switch	-	Rear seat memory operation stops, or does not operate	None
Seat return for rear seat (when rear seat doors are opened)	Rear Power Seat Module Switch	Main Body ECU (MS bus) No. 1 Meter ECU (MS bus) Rear Multiplex Network Door ECU LH Rear Multiplex Network Door ECU RH Rear Power Seat Module Switch	-	Rear seat return does not operate	None
Seat return for rear seat (via switch)	Rear Power Seat Module Switch	Outer Mirror Switch Rear Power Seat Module Switch	-	Rear seat return does not operate	None
Rear seat heater (ventilation)	Rear Power Seat Module Switch	Outer Mirror Switch Rear Power Seat Module Switch	-	Rear seat heater does not operate	None
Belt anchor call control (driver seat and passenger seat)	Rear Junction Block ECU	Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH Front Power Seat ECU and Switch LH Rear Junction Block ECU	Rear Junction Block ECU	During DRD or DRP communication stop: when belt anchor is operating, it stops During DST communication stop: when belt anchor call is operating, it stops	None
Wiper control	Front Controller	ECM (V bus) Main Body ECU (MS bus) No. 1 Meter ECU (MS bus) Front Controller Combination Switch	Front Controller	During CMB communication stop: Previous operation is maintained and control is continued During MET, BDB or ENG communication stop: Vehicle speed wiper control is not possible (when vehicle is stopped, operates on LO)	None
Washer motor control	Front Controller	Main Body ECU (MS bus) Front Controller Combination Switch	Front Controller	During CMB communication stop: Washer motor stops (when operating, stops after 40 +/-8 sec.) During BDB communication stop: Washer motor stops	None
Vehicle speed display	No. 1 Meter ECU (V bus)	Skid Control ECU (V bus)	-	Vehicle speed display not possible	While vehicle is driven, vehicle speed display is 0 km/h (mph)
Tachometer display	No. 1 Meter ECU (V bus)	ECM (V bus)	-	Tachometer display not possible	While vehicle is driven, tachometer display is 0 rpm
Water temperature display	No. 1 Meter ECU (V bus)	ECM (V bus)	-	Water temperature display not possible	Water temperature needle points to less than C
Fuel gauge	No. 1 Meter ECU (V bus)	Rear Junction Block ECU	-	Fuel display not possible	Fuel needle points to less than E
Odometer/Trip meter	No. 1 Meter ECU (V bus)	Skid Control ECU (V bus)	-	Quantity survey not possible	None
A/T shift indicator	No. 1 Meter ECU (V bus)	ECM (V bus)	-	Shift display turns OFF	None
Rheostat control	Main Body ECU (MS bus)	Main Body ECU (MS bus)	No. 1 Meter ECU (MS bus)	Rheostat control impossible	None
Buzzer	ECM (V bus) Skid Control ECU (V bus) Center Airbag Sensor Main Body ECU (MS bus) Certification ECU Front Controller Driving Support ECU (MS bus) Parking Assist ECU	ECM (V bus) Skid Control ECU (V bus) Center Airbag Sensor Main Body ECU (MS bus) Certification ECU Front Controller Driving Support ECU (MS bus) Skid Control ECU	No. 1 Meter ECU (V bus) No. 1 Meter ECU (MS bus)	Buzzer stops	None
Combination meter diagnosis (telltale)	ECM (V bus) Center Airbag Sensor Tire Pressure Warning ECU Driving Support ECU (Steering bus) Skid Control ECU (Steering bus) Power Steering ECU (Steering bus) Steering Control ECU (Steering bus) Suspension Control ECU (Steering bus) Seat Belt Control ECU Electric Parking Brake ECU Parking Assist ECU Clearance Warning ECU	ECM (V bus) No. 1 Meter ECU (V bus) Center Airbag Sensor Tire Pressure Warning ECU Driving Support ECU (Steering bus) Skid Control ECU (Steering bus) Power Steering ECU (Steering bus) Steering Control ECU (Steering bus) Suspension Control ECU (Steering bus) Seat Belt Control ECU Electric Parking Brake ECU	No. 1 Meter ECU (V bus)	Indicator illuminates	Active operation indicator illuminates
Potential cruising distance	No. 1 Meter ECU (V bus)	ECM (V bus) Rear Junction Block ECU	No. 1 Meter ECU (V bus)	Value display is not possible	None
Average overall mileage	No. 1 Meter ECU (V bus)	ECM (V bus) Skid Control ECU (V bus)	No. 1 Meter ECU (V bus)	Value display is not possible	None
Current mileage	No. 1 Meter ECU (V bus)	ECM (V bus) Skid Control ECU (V bus)	No. 1 Meter ECU (V bus)	Value display is not possible	None
Average mileage after lubrication	No. 1 Meter ECU (V bus)	ECM (V bus) Skid Control ECU (V bus)	No. 1 Meter ECU (V bus)	Value display is not possible	None
Traveling distance after lubrication	No. 1 Meter ECU (V bus)	Skid Control ECU (V bus)	No. 1 Meter ECU (V bus)	Value display is not possible	None
Average overall speed	No. 1 Meter ECU (V bus)	Skid Control ECU (V bus)	No. 1 Meter ECU (V bus)	Value display is not possible	None
Charge control	Electric Power Control ECU	ECM (V bus) Main Body ECU (V bus) Air Conditioning Amplifier Front Controller	-	No vehicle symptoms	None
Load control	Electric Power Control ECU	ECM (V bus) Skid Control ECU (V bus) Main Body ECU (V bus) Air Conditioning Amplifier Front Controller Driving Support ECU (MS bus) Power Steering ECU (Steering bus)	-	No vehicle symptoms	None
Parked vehicle power saving controlled	Electric Power Control ECU	Main Body ECU (V bus)	-	No vehicle symptoms	None
Charging system malfunction detection	Electric Power Control ECU	ECM (V bus) Main Body ECU (V bus) Front Controller	-	No vehicle symptoms	None
Air conditioning	Air Conditioning Amplifier	Main Body ECU (V bus) No. 1 Meter ECU (V bus) Front Controller ECM (V bus)	Air Conditioning Amplifier	Compressor OFF Set temperature: Fahrenheit default operates (if communication stop occurs, previous operation is maintained)	Outside temperature "E" is displayed
Air conditioning related switch operation information (EMVN)	Air Conditioning Amplifier	Display and Navigation (Multi-display)	Air Conditioning Amplifier	No vehicle symptoms	When A/C warning on screen display instruction signal is received: Navigation screen displays "Check the condition to the air conditioner"
Rear air conditioning	Rear Power Seat Module Switch	Air Conditioning Amplifier Main Body ECU (MS bus)	Rear Power Seat Module Switch	Rear air conditioning stops	None
Rear A/C magnet valve	Air Conditioning Amplifier	Air Conditioning Amplifier Display and Navigation (Multi-display)	Rear Junction Block ECU	Rear air conditioning magnet valve output OFF	None
Rear defogger	Air Conditioning Amplifier	Air Conditioning Amplifier Display and Navigation (Multi-display)	Front Controller	ACN: operation not possible	None
Wiper deicer	Air Conditioning Amplifier	Air Conditioning Amplifier Display and Navigation (Multi-display)	Front Controller	ACN: operation not possible	None
RFC fan control	ECM (V bus)	ECM (V bus)	Front Controller	Operates at 100% output	None
Headlight swivel/leveling control	AFS ECU	ECM (V bus) Skid Control ECU (V bus) Main Body ECU (V bus) Outer Mirror Switch Steering Angle Sensor Steering Control ECU	-	Swivel control stops Leveling control continues	Navigation screen displays "Check AFS", and master caution is illuminated AFS indicator blinks
Tilt and telescopic control	Multiplex tilt and Telescopic ECU	Main Body ECU (MS bus) Front Power Seat ECU and Switch LH Combination Switch Multiplex tilt and Telescopic ECU	Multiplex tilt and Telescopic ECU	During DST communication stop: auto and manual control is permitted; call control is prohibited During CMB communication stop: auto and call control is permitted; manual control is prohibited During BDB communication stop: auto, manual and call control is prohibited (however, if engine switch is turned on (IG), permitted)	None
Horn control	Main Body ECU (MS bus)	Main Body ECU (MS bus) Steering Pad ECU	Front Controller	Horn does not operate	None
Fuel lid opener	Main Body ECU (MS bus)	Main Body ECU (MS bus)	Rear Junction Block ECU	Open and close is not possible	None
Rear door sunshade	Rear Multiplex Network Door ECU RH Rear Multiplex Network Door ECU LH	Main Body ECU (MS bus) Rear Multiplex Network Door ECU RH Rear Multiplex Network Door ECU LH Outer Mirror Switch Rear Power Seat Module Switch	Rear Multiplex Network Door ECU RH Rear Multiplex Network Door ECU LH	Rear sunshade stops (if operating, continues operating)	None
Rear sunshade	Main Body ECU (MS bus)	Main Body ECU (MS bus) Outer Mirror Switch Rear Junction Block ECU Rear Power Seat Module Switch	Rear Junction Block ECU	During BDB communication stop: When vehicle is moving in reverse, shift-linked function operation is not possible During DMS communication stop: During front seat switch operation, operation is impossible During RCN communication stop: During rear seat switch operation, operation is impossible	None
Event recorder	Center Airbag Sensor	ECM (V bus)	-	Event recorder stops	None
NAVI-AI-SHIFT control	ECM (V bus)	ECM (V bus) Display and Navigation (Multi-display)	ECM (V bus)	Control does not start (on navigation screen, "NAVI-AI-SHIFT" is selected)	None
Control for changing air conditioning from FRESH to RECIRC when entering tunnel	Air Conditioning Amplifier	Air Conditioning Amplifier Display and Navigation (Multi-display)	Air Conditioning Amplifier	Control does not start (FRESH/RECIRC change switch's "AUTO" is selected)	None
Tunnel prediction AFS control	AFS ECU	Display and Navigation (Multi-display) AFS ECU	AFS ECU	Control does not start (Light switch "AUTO" and AFS "ON" are selected)	None
Navigation system cooperation AVS control	Suspension Control ECU (Steering bus)	Display and Navigation (Multi-display) Suspension Control ECU (Steering bus)	Suspension Control ECU (Steering bus)	Control does not start	None
Rear view monitor control (for depicting guide/course line)	Display and Navigation (Multi-display)	Steering Angle Sensor Steering Control ECU (Steering bus)	-	Display's expected course lines are erased	Navigation screen displays "Guidance unavailable"
ACC control	Driving Support ECU (Steering bus) Driving Support ECU (Braking and Driving bus)	Main Body ECU (MS bus) No. 1 Meter ECU (MS bus) Front Controller Outer Mirror Switch Steering Angle Sensor Yaw Rate Sensor ECM (Braking and Driving bus) Skid Control ECU (Braking and Driving bus) Steering Control ECU (Braking and Driving bus)	ECM (Steering bus) Skid Control ECU (Steering bus)	When vehicle is stopped: ACC control is canceled and oil pressure is slowly decreased; then control is prohibited When vehicle is driven or control is operating: ACC control is canceled	Multi-information display: "Check cruise control system" is displayed and master caution is illuminated Cruise indicator illuminates (green)
PCS control	Driving Support ECU (Steering bus) Driving Support ECU (Braking and Driving bus)	Main Body ECU (MS bus) No. 1 Meter ECU (MS bus) Combination Switch Steering Angle Sensor Yaw Rate Sensor ECM (Braking and Driving bus) Skid Control ECU (Braking and Driving bus) Steering Control ECU (Braking and Driving bus) Suspension Control ECU (Braking and Driving bus)	ECM (Steering bus) Skid Control ECU (Steering bus)	No vehicle symptoms	Multi-information display: "Check PCS system" is displayed and master caution is illuminated PCS indicator illuminates (yellow)
Damping force control function	Suspension Control ECU (Steering bus) Suspension Control ECU (Braking and Driving bus)	No. 1 Meter ECU (V bus) Display and Navigation (Multi-display) AFS ECU Outer Mirror Switch Driving Support ECU (Steering bus) Skid Control ECU (Steering bus) Steering Angle Sensor Yaw Rate Sensor Steering Control ECU (Steering bus) ECM (Braking and Driving bus) Skid Control ECU (Braking and Driving bus)	Suspension Control ECU (Steering bus) Suspension Control ECU (Braking and Driving bus)	No vehicle symptoms	None
Vehicle height adjustment function	Suspension Control ECU (Steering bus) Suspension Control ECU (Braking and Driving bus)	Main Body ECU (V bus) No. 1 Meter ECU (V bus) Electric Power Control ECU Skid Control ECU (Steering bus) Steering Angle Sensor Yaw Rate Sensor Steering Control ECU (Steering bus) ECM (Braking and Driving bus) Skid Control ECU (Braking and Driving bus)	-	No vehicle symptoms	None
APGS control	Parking Assist ECU	Air Conditioning Amplifier AFS ECU Steering Angle Sensor Yaw Rate Sensor Power Steering ECU (Steering bus) Steering Control ECU (Steering bus) ECM (Braking and Driving bus) Skid Control ECU (Braking and Driving bus) Electric Parking Brake ECU	-	When vehicle is stopped: APGS control start is not possible When vehicle is driven or control is operating: APGS control start is stopped	During ENG, Electronically controlled brake, Electric parking brake, VGR, EPS, STR and AFS communication stop: Navigation screen: "Check APGS system" Audio: "The Guidance has been canceled" During YGS communication stop: No display and no B buzzer operation (IPA control start and idle speed control not possible
Column guide transition	Parking Assist ECU	Skid Control ECU (Steering bus)	-	When vehicle is stopped: During column guide display: Because column guide is displayed based on yaw rate information, user cannot detect communication malfunction Information setting screen: When vehicle speed is increasing, vehicle speed is confirmed because switch is not displayed. When vehicle is driven or control is operating: After vehicle speed has increased, switch changes from not displayed to displayed When vehicle is driven or control is operating: Information setting screen: When vehicle speed is increasing, vehicle speed is confirmed because switch is not displayed. When vehicle is driven or control is operating: After vehicle speed has increased, switch changes from not displayed to displayed	None
Clearance sonar function	Parking Assist ECU Clearance Warning ECU	No. 1 Meter ECU (V bus) Air Conditioning Amplifier Display and Navigation (Multi-display) Main Body ECU (V bus) Front Controller Outer Mirror Switch ECM (V bus, Braking and Driving bus)	-	When there is vehicle speed signal stop or shift signal stop: Obstacle detection stops When other signals stop: Vehicle condition before signal stop is maintained	None
VDIM control	Skid Control ECU (Steering bus) Skid Control ECU (Braking and Driving bus)	Steering Angle Sensor Yaw Rate Sensor Power Steering ECU (Steering bus) Steering Control ECU (Steering bus) ECM (Braking and Driving bus)	-	When vehicle is stopped: No vehicle behavior When vehicle is driven or control is operating: After back-up control (vehicle behavior stable) is complete, changes to normal brake operation and then control is prohibited	ABS warning lights illuminate and brake hold indicator flashes (however, brake hold warning light illuminates only when brake hold operation is performed) SLIP indicator illuminates Multi-information display: "Check VSC system" is displayed and master caution is illuminated
Brake hold control	Skid Control ECU (Braking and Driving bus)	ECM (Braking and Driving bus) Electric Parking Brake ECU	-	When vehicle is stopped: When brakes or accelerator pedal is depressed, oil pressure is released and control is prohibited When vehicle is driven or control is operating: No recognizable vehicle behavior	Brake hold indicator flashes (however, brake hold warning light illuminates only when it is selected) SLIP indicator illuminates Multi-information display: "Check VSC system", Check brake hold system" is displayed and master caution is illuminated
Emergency stop light activation (during radar cruising)	Skid Control ECU (V bus)	Skid Control ECU (V bus) Driving Support ECU (MS bus)	Rear Junction Block ECU	Emergency stop light does not operate	None
Millimeter wave linked pre-collision system	Seat Belt Control ECU	Driving Support ECU (Steering bus) Center Airbag Sensor Main Body ECU (V bus) Skid Control ECU (Steering bus)	-	No vehicle symptoms	When PCS is malfunctioning: PCS warning light illuminates Multi-information display: "Check PCS system" is displayed and master caution is illuminated When millimeter wave radar is malfunctioning: PCS warning light blinks Multi-information display: "PCS not available now" is displayed and master caution is illuminated
Pre-collision emergency braking	Seat Belt Control ECU	Skid Control ECU (Steering bus) Center Airbag Sensor Main Body ECU (V bus)	-	No vehicle symptoms	When PCS is malfunctioning: PCS warning light illuminates Multi-information display: "Check PCS system" is displayed and master caution is illuminated When millimeter wave radar is malfunctioning: PCS warning light blinks Multi-information display: "PCS not available now" is displayed and master caution is illuminated
EPS assist control	Power Steering ECU (Steering bus) Power Steering ECU (Braking and Driving bus)	Air Conditioning Amplifier AFS ECU Electric Power Control ECU Driving Support ECU (Steering bus) Skid Control ECU (Steering bus) Steering Angle Sensor Steering Control ECU (Steering bus) Suspension Control ECU (Steering bus) ECM (Braking and Driving bus) Parking Assist ECU	Power Steering ECU (Steering bus) Power Steering ECU (Braking and Driving bus)	Only during vehicle speed (Electronically controlled brake) communication stop, assist control when vehicle speed is 100 km/h (160 mph) is provided (for other situations, no vehicle behavior)	During communication stop of vehicle speed (Electronically controlled brake) or steering angle information (VGR): P/S warning illuminates Other warnings do not illuminate
VGRS control	Steering Control ECU (Steering bus) Steering Control ECU (Braking and Driving bus)	Skid Control ECU (Steering bus) Steering Angle Sensor Yaw Rate Sensor Power Steering ECU (Steering bus) ECM (Braking and Driving bus) Skid Control ECU (Braking and Driving bus)	-	VGRS control is prohibited	Multi-information display: "Check VGRS" is displayed and master caution is illuminated
VDM-β" control	Steering Control ECU (Steering bus)	Skid Control ECU (Steering bus) Steering Angle Sensor Yaw Rate Sensor	-	VDM-β control is prohibited	Multi-information display: "Check VSC system" is displayed and master caution is illuminated
Dynamic parking brake (during manual lock release operation)	Electric Parking Brake ECU	Skid Control ECU (Braking and Driving bus)	Electric Parking Brake ECU	When vehicle is driven or control is operating: Automatic release is not operated, and tires lock	Electronically controlled brake warning light (yellow "!") illuminates Short term buzzer Multi-information display: "Check parking brake system" and "Release the parking brake" Electronically controlled brake lock condition: Intermittent buzzer
Shift-linked parking brake (when select switch is AUTO)	Electric Parking Brake ECU	ECM (Braking and Driving bus) Yaw Rate Sensor Skid Control ECU (Braking and Driving bus)	Electric Parking Brake ECU	When vehicle is stopped: Linked operation with shift lever is not possible When vehicle is driven or control is operating: Shift-linked select switch light turns OFF, and shift-linked operation does not occur	If selecting, automatic control switch's LED turns OFF Electric parking brake warning light (yellow "!") illuminates Short term buzzer Multi-information display: "Check parking brake system"
Tension adjustment	Electric Parking Brake ECU	Yaw Rate Sensor	-	When vehicle is stopped: Tension adjustment not possible Maximum tension control is performed	Electric parking brake warning light (yellow "!") illuminates Short term buzzer Multi-information display: "Check parking brake system"
Backup oil pressure maintenance for when vehicle is stopped (brake hold)	Electric Parking Brake ECU	Skid Control ECU (Braking and Driving bus) Yaw Rate Sensor	-	When vehicle is stopped: During brake hold operation: Parking brake lock control is performed, and continuous operation of brake hold cannot be performed Parking brake lock control is performed, and continuous control of brake hold cannot be performed While driving vehicle: Brake hold control is not possible, and backup oil pressure maintenance operation does not operate Brake hold control is not possible, and backup oil pressure maintenance operation does not operate	If selecting, brake hold light (green) blinks Electric parking brake warning light (yellow "!") illuminates short term buzzer Multi-information display: "Check parking brake system"
MS bus monitoring function	Main Body ECU (MS bus)	No. 1 Meter ECU (MS bus) Certification ECU Front Controller Front Multiplex Network Door ECU LH Front Multiplex Network Door ECU RH Rear Multiplex Network Door ECU LH Rear Multiplex Network Door ECU RH Front Power Seat ECU and Switch LH Front Power Seat ECU and Switch RH Combination Switch Steering Pad ECU Outer Mirror Switch Multiplex tilt and Telescopic ECU Tire Pressure Warning ECU Rear Junction Block ECU Rear Power Seat Module Switch Power Trunk Lid Control ECU Bus Buffer ECU Driving Support ECU (MS bus)	-	Communication malfunction is detected	None
Steering bus monitoring function	Skid Control ECU (Steering bus)	Driving Support ECU (Steering bus) ECM (Steering bus) Steering Angle Sensor Yaw Rate Sensor Power Steering ECU (Steering bus) Steering Control ECU (Steering bus) Absorbing Control ECU (Steering bus) Seat Belt Control ECU	-	Communication malfunction is detected	None
Braking/Driving system bus monitoring function	ECM (Braking and Driving bus)	Driving Support ECU (Braking and Driving bus) Skid Control ECU (Braking and Driving bus) Power Steering ECU (Braking and Driving bus) Steering Control ECU (Braking and Driving bus) Electric Parking Brake ECU Suspension Control ECU (Braking and Driving bus) Parking Assist ECU Clearance Warning ECU	-	Communication malfunction is detected	None