CAN COMMUNICATION SYSTEM(for LHD with Entry and Start System) FAIL-SAFE CHART


  1. FAIL-SAFE FUNCTION


    1. When communication fails in any of the CAN bus wires (communication wires), a fail-safe function(s) operates. The fail-safe function that is specified for each system operates to prevent those systems from malfunctioning.

    2. Effects on each system when communication is impossible (for further details, see the pages for each system).

      Function

      (Function Description)

      1. Control Master

      2. System Related

      		 Behavior in Communication Failure User Notification Diagnostic Trouble Code

      Kinetic Dynamic Suspension System

      (Opens and closes the accumulator valve to suppress roll.)

      1. Stabilizer control ECU

      2. ECM, Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU), Spiral cable sub-assembly (steering angle sensor), Yaw rate sensor assembly, Combination meter assembly

      • U0100: Control continues.

      • U0122: The accumulator valve is open.

      • U0124: Control continues using only the steering angle sensor signal.

      • U0126: Control continues using only the yaw rate signal.

      • U0100: Nothing

      • U0122, U0124, U0126: The kinetic dynamic suspension indicator light turns on.

      • U0100

      • U0122

      • U0124

      • U0126

      Vehicle Height Control

      (Performs vehicle height adjustments.)

      1. Suspension control ECU

      2. ECM, Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU), Spiral cable sub-assembly (steering angle sensor), Yaw rate sensor assembly, Four wheel drive control ECU, Main body ECU (multiplex network body ECU)

      • U0100: Control continues operation.

      • U0114: Control continues operation.

      • U0122: The normal vehicle height is maintained.

      • U0124: Control continues operation.

      • U0126: Control continues operation.

      • U0140: Control continues operation.

      • U0100: Nothing

      • U0114: Nothing

      • U0122: The warning is displayed.

      • U0124: Nothing

      • U0126: Nothing

      • U0140: Nothing

      • U0100

      • U0114

      • U0122

      • U0124

      • U0126

      • U0140

      Damping Force Control

      (Controls the variable damping force depending on the vehicle state.)

      1. Suspension control ECU

      2. ECM, Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU), Spiral cable sub-assembly (steering angle sensor), Yaw rate sensor assembly, Four wheel drive control ECU, Navigation receiver assembly, Stabilizer control ECU, Driving support ECU assembly

      • U0100: Control continues.

      • U0114: Control continues.

      • U0122: The damper steps become fixed.

      • U0124: Roll suppression stops.

      • U0126: The damper steps become fixed.

      		 Nothing

      • U0100

      • U0114

      • U0122

      • U0124

      • U0126

      Vehicle Speed Information Input

      (Controls solenoid current [PPS solenoid] according to the vehicle speed, steering angle, steering speed and engine speed.)

      1. Power steering ECU assembly

      2. Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU)

      • Power steering back-up control

      • The PPS indicator light turns on.

      		 The PPS indicator light turns on. U0129

      Steering Wheel Angle Information Input

      (Controls solenoid current [PPS solenoid] according to the vehicle speed, steering angle, steering speed and engine speed.)

      1. Power steering ECU assembly

      2. Spiral cable sub-assembly (steering angle sensor)

      • Power steering back-up control

      • The PPS indicator light turns on.

      		 The PPS indicator light turns on. U0126

      Engine Speed Information Input

      (Controls solenoid current [PPS solenoid] according to the vehicle speed, steering angle, steering speed and engine speed.)

      1. Power steering ECU assembly

      2. ECM

      • Power steering back-up control

      • The PPS indicator light turns on.

      		 The PPS indicator light turns on. U0100

      L4 Status Signal

      (Controls solenoid current according to the vehicle speed and L4 status signal.)

      1. Power steering ECU assembly

      2. Four wheel drive control ECU

      		 Normal operation Nothing -

      AVS Mode Information

      (Controls solenoid current according to AVS mode.)

      1. Power steering ECU assembly

      2. Suspension control ECU

      		 Previous values maintained. Nothing -

      2WD/4WD/OBD Information

      (Controls solenoid current according to 2WD/4WD/OBD.)

      1. Power steering ECU assembly

      2. ECM

      		 Previous values maintained. Nothing U0100

      Warning Light Information

      (Controls PPS warning light illumination.)

      1. Combination meter assembly

      2. Power steering ECU assembly

      		 - Nothing -

      High-Low Switching Limitation

      (Prohibits high-low switching when the vehicle speed or engine speed is outside the acceptable range or the A/T is not in N during the A/T status check.)

      1. Four wheel drive control ECU

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

      		 High-low switching is prohibited. The 4LO indicator light blinks and the buzzer sounds. -

      Center Differential Lock Switching Limitation

      (Prohibits center differential lock switching when the difference in wheel speeds is large.)

      1. Four wheel drive control ECU

      2. Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU), Combination meter assembly

      		 Prohibits center differential lock switching. The center differential lock indicator light blinks and the buzzer sounds. -

      Rear Differential Lock Switching Limitation

      (Prohibits rear differential lock switching when the vehicle speed is outside the acceptable range.)

      1. Four wheel drive control ECU

      2. Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU), Combination meter assembly

      		 Rear differential lock switching is prohibited. The rear differential lock indicator light blinks. -

      L4F Switching Limitation

      (Prohibits switching to L4F when VSC is malfunctioning.)

      1. Four wheel drive control ECU

      2. Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU), Combination meter assembly

      		 L4F switching is prohibited. The 4LO indicator light blinks. -

      Specialized Control during Wheel Speed Failure

      (When there is abnormal wheel speed, this control permits switching only when specified conditions are met (not all wheel speeds are abnormal, the brakes are applied, the engine speed is low and all normal wheel speeds are low).)

      1. Four wheel drive control ECU

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

      		 When all 4 wheels are malfunctioning, switching is prohibited. The 4LO indicator light blinks quickly. -

      Indicator/Buzzer Signal Output

      (Outputs a signal indicating the indicator and buzzer state, which is used to determine the actuator position and switching status.)

      1. Four wheel drive control ECU

      2. Combination meter assembly

      		 State signal update is not possible. Nothing -

      H-L Actuator Failure Signal Output

      (Outputs a signal when the H-L actuator limit switch is malfunctioning.)

      1. Four wheel drive control ECU

      2. ECM, Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU)

      		 State signal update is not possible. The 4LO indicator light blinks quickly. -

      Cruise Control Cancel Signal Output

      (Outputs a cruise control cancel signal when center differential switching is not completed even though 5 seconds or more have elapsed from the start of switching.)

      1. Four wheel drive control ECU

      2. ECM

      		 State signal update is not possible. Nothing -

      L4 State Signal Output

      (Outputs a signal when switching to the L4 position is finished.)

      1. Four wheel drive control ECU

      2. Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU), Combination meter assembly

      		 State signal update is not possible. The status of the indicator lights change in accordance with changes in the L4 state signal. -

      Center Differential Lock State Signal Output

      (Outputs the center differential lock P/S state.)

      1. Four wheel drive control ECU

      2. Combination meter assembly

      		 State signal update is not possible. The status of the indicator lights change in accordance with changes in the center differential lock state signal -

      Rear Differential Lock State Signal Output

      (Outputs the rear differential lock P/S state.)

      1. Four wheel drive control ECU

      2. Combination meter assembly

      		 State signal update is not possible. The status of the indicator lights change in accordance with changes in the rear differential lock state signal. -

      Signal Output during Switching

      (Outputs the actuator switching state.)

      1. Four wheel drive control ECU

      2. Combination meter assembly

      		 State signal update is not possible. The indicator lights blink during signal output during switching. -

      Multi-terrain Select Output

      (Outputs the signal to stop the multi-terrain select service.)

      1. Four wheel drive control ECU

      2. Driving support switch control ECU

      		 State signal update is not possible. The status of the indicator lights change in accordance with changes in the multi-terrain select state signal. -

      Entry Functions

      (Operates the entry lock/unlock, entry trunk open/entry back door unlatch and entry warning/illumination functions.)

      1. Certification ECU (smart key ECU assembly), Main body ECU (multiplex network body ECU)

      2. Combination meter assembly, Main body ECU (multiplex network body ECU)

      		 The entry functions do not operate. Nothing U0142

      Wireless Functions

      (Operates the wireless lock/unlock, trunk and panic functions.)

      1. Main body ECU (multiplex network body ECU)

      2. Certification ECU (smart key ECU assembly)

      		 The wireless functions do not operate. Nothing U0142

      Engine Switch Illumination Control

      (Turns the engine switch illumination on/off.)

      1. Certification ECU (smart key ECU assembly)

      2. Certification ECU (smart key ECU assembly), Main body ECU (multiplex network body ECU)

      		 The engine switch illumination does not operate. Nothing U0142

      Memory Function

      (Moves the seat, steering wheel and outer mirrors to a previously memorized position when an entry or wireless unlock operation is performed.)

      1. Main body ECU (multiplex network body ECU)

      2. ECM, Certification ECU (smart key ECU assembly), Front power seat switch LH, Multiplex tilt and telescopic ECU

      		 The memory functions do not operate. Nothing U0142

      VAST Function

      (Changes settings based on previously stored driver information.)

      1. Main body ECU (multiplex network body ECU)

      2. Certification ECU (smart key ECU assembly), Air conditioning amplifier assembly

      		 Driver identification is not performed. Nothing U0142

      Microcomputer Preset Steering

      (Controls the operation of the autoaway/return function and memorized driver position restoration function activated by the insertion or removal of the key or a seat belt buckle.)

      1. Multiplex tilt and telescopic ECU

      2. Combination meter assembly, Main body ECU (multiplex network body ECU), Front power seat switch LH

      		 The power tilt and telescopic steering system and its memory and restore functions do not operate. Nothing

      • B2621

      • B2624

      ABS Control

      (Controls the ABS according to the G sensor signal.)

      1. Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU)

      2. Yaw rate sensor assembly, Combination meter assembly

      		 The ABS does not operate. The light illuminates.

      • U0073

      • U0123

      • U0124

      TRC Control

      (Controls the brakes and engine torque during acceleration slip.)

      1. Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU)

      2. ECM, Spiral cable sub-assembly (steering angle sensor), Yaw rate sensor assembly, Combination meter assembly

      		 TRC does not operate. The light illuminates.

      • U0073

      • U0100

      • U0123

      • U0124

      • U0126

      VSC Control

      (Controls VSC according to the yaw rate sensor and steering angle sensor signals.)

      1. Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU)

      2. ECM, Spiral cable sub-assembly (steering angle sensor), Yaw rate sensor assembly, Combination meter assembly

      		 VSC does not operate. The light illuminates.

      • U0073

      • U0100

      • U0123

      • U0124

      • U0126

      Rear View Monitor

      (Displays steering angle-linked guide lines.)

      1. Parking assist ECU

      2. Spiral cable sub-assembly (steering angle sensor)

      		 The guide lines are not displayed. "Guidance unavailable." is displayed at the bottom of the screen.

      • U0073

      • U0126

      • U1000

      Wide View Front and Side Monitor

      (Displays steering angle-linked guide lines on the side monitor display screen. Displays steering angle-linked guide lines on the side monitor of the wide view front and side monitor simultaneous display screen.)

      1. Parking assist ECU

      2. Spiral cable sub-assembly (steering angle sensor)

      		 The guide lines are not displayed. "Guidance unavailable." is displayed at the bottom of the screen.

      • U0073

      • U0126

      • U1000

      Wide View Front and Side Monitor

      (Determines whether camera image can be displayed or not.)

      1. Parking assist ECU

      2. ECM, Master cylinder solenoid (skid control ECU)

      • When the camera screen is being displayed, the screen changes to the navigation screen.

      • When the camera screen is not displayed, switching to the camera screen is disabled.

      		 Nothing

      • U0073

      • U0100

      • U0129

      • U1000

      Multi-terrain Monitor

      (Changes to the camera screen automatically.)

      1. Parking assist ECU

      2. ECM, Master cylinder solenoid (skid control ECU)

      • When the camera screen is being displayed, the screen changes to the navigation screen.

      • When the camera screen is not displayed, switching to the camera screen is disabled.

      		 Nothing

      • U0073

      • U0100

      • U0129

      • U1000

      Camera Screen Display on multi-display (display panel)

      (Displays camera image on the display.)

      1. Parking assist ECU

      2. -

      • When the camera screen is being displayed, the screen changes to the navigation screen.

      • When the camera screen is not displayed, switching to the camera screen is disabled.

      		 Nothing

      • U0073

      • U1000
      Camera System Factory Adjustment

      1. Parking assist ECU

      2. Main body ECU (multiplex network body ECU)

      		 A back door open warning message is displayed. A back door open warning message is displayed.

      • U0073

      • U0140

      • U1000

      Steering Sensor

      (Detects the steering wheel angle.)

      1. Spiral cable sub-assembly (steering angle sensor)

      2. Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU), Combination meter assembly

      		 - The VSC OFF indicator light turns on. -

      TOYOTA Parking Assist-sensor System

      (Receives object detection information from the sensors and sounds a buzzer and displays information according to the distance to the detected object.)

      1. Clearance warning ECU assembly

      2. ECM, Combination meter assembly, Navigation receiver assembly, Radio and display receiver assembly, Main body ECU (multiplex network body ECU), Air conditioning amplifier assembly

      		 Object detection stops. Nothing

      • U0100

      • U0101

      • U0155

      Speedometer

      (Controls the speedometer according to the vehicle speed signals.)

      1. Combination meter assembly

      2. Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU)

      		 The speedometer displays 0 km/h (0 mph). Nothing -

      Tachometer

      (Controls the tachometer according to the engine speed signals.)

      1. Combination meter assembly

      2. ECM

      		 The tachometer displays 0 rpm. Nothing -

      Engine Coolant Temperature Receiver Gauge

      (Controls the engine coolant temperature receiver gauge according to the temperature signals.)

      1. Combination meter assembly

      2. ECM

      		 The temperature gauge needle is at the middle of the "C" mark or below. Nothing -

      Fuel Receiver Gauge

      (Determines the vehicle condition and amount of remaining fuel according to the starter signal and vehicle speed signal and sends commands to the fuel receiver gauge.)

      1. Combination meter assembly

      2. ECM, Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU), Main body ECU (multiplex network body ECU)

      • When communication is lost with the main body ECU:


        • Operates with the parking brake released.

        • Engine switch is off.

      • When communication is lost with a device other than the main body ECU:


        • Operates the same as when the vehicle is stopped.

        • Operates with starter off.

      		 Nothing -

      ODO/TRIP Meter

      (Calculates and indicates the driven distance according to the pulse count of the vehicle speed pulse signal.)

      1. Combination meter assembly

      2. Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU)

      		 ODO/TRIP meter stops calculating the total distance driven and displays the last valid value. Nothing -

      Shift Display

      (Displays the shift information according to the shift position signal.)

      1. Combination meter assembly

      2. ECM

      		 The shift display turns off. Nothing -

      Telltale

      (Controls the indicator illumination and blinking according to the CAN signals and direct line input signals.)

      1. Combination meter assembly

      2. Center airbag sensor assembly

      		 -

      • The SRS warning light illuminates.

      • The status of the front passenger side seat belt warning light is maintained.

      		 -

      1. Combination meter assembly

      2. Headlight swivel ECU assembly

      		 - The status of the headlight beam level control system warning light is maintained. -

      1. Combination meter assembly

      2. Main body ECU (multiplex network body ECU)

      		 -

      • The status of the following indicators (warning lights) is maintained when the engine switch is on (IG) and turn off when the engine switch is turned off:


        • Beam indicator light

        • HEAD indicator light

        • Tail indicator light

        • Open door warning light

        • Driver side seat belt warning light

        • Brake warning light

        • Front fog indicator light

        • Rear fog indicator light

      		 -

      Telltale

      (Controls the indicator illumination and blinking according to the CAN signals and direct line input signals.)

      1. Combination meter assembly

      2. ECM

      		 -

      • The status of the following indicators (warning lights) is maintained when the engine switch is on (IG) and turn off when the engine switch is turned off:


        • A/T fluid temperature warning light

        • Charge warning light

        • Radar cruise indicator light

        • Cruise main indicator light

        • Cruise set indicator light

        • 2nd start indicator light

        • "Engine oil pressure low" message

      • The following indicators turn off: Eco driving indicator light

      		 -

      1. Combination meter assembly

      2. Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU)

      		 -

      • The following indicators (warning lights) turn on:


        • Brake warning light

        • ABS warning light

      • The speed limit indicator light turns off.

      • The status of the following indicators (warning lights) is maintained when the engine switch is on (IG) and turn off when the engine switch is turned off:


        • "TRAC OFF" message

        • CRAWL indicator light

        • Downhill assist control indicator light

      • The slip indicator light turns on or the indicator status is maintained (when the engine switch is turned on [IG]).

      		 -

      1. Combination meter assembly

      2. Four wheel drive control ECU

      		 -

      • The status of the following indicators (warning lights) is maintained when the engine switch is on (IG) and turn off when the engine switch is turned off:


        • Center differential lock indicator

        • Rear differential lock indicator

        • 4LO indicator light

      		 -

      1. Combination meter assembly

      2. Stabilizer control ECU

      		 - The kinetic dynamic suspension indicator light turns on. -

      1. Combination meter assembly

      2. Certification ECU (smart key ECU assembly)

      		 - The status of the indicators related to the entry function is maintained (the status of the indicators is maintained when the engine switch is on [IG] and the indicators turn off when the engine switch is turned off.). -

      Telltale

      (Controls the indicator illumination and blinking according to the CAN signals and direct line input signals.)

      1. Combination meter assembly

      2. Seat belt control ECU, Driving support ECU assembly

      		 - The status of the PCS indicator light is maintained (the status of the indicators is maintained when the engine switch is on [IG] and the indicators turn off when the engine switch is turned off.). -

      1. Combination meter assembly

      2. Blind spot monitor sensor LH

      		 - The status of the BSM indicator light is maintained (the status is maintained when the engine switch is on (IG) and the light turns off when the engine switch is turned off.) -

      Buzzers

      (Controls the buzzer sounding according to the CAN signals and direct line input signals.)

      1. Combination meter assembly

      2. ECM

      		 -

      • The dynamic radar cruise control warning buzzer does not sound.

      • The status of the signals for the following buzzers is maintained:


        • Sports shift reject buzzer

        • Dynamic radar cruise control low speed cancel buzzer

      		 -

      1. Combination meter assembly

      2. Main body ECU (multiplex network body ECU)

      		 -

      • The status of the signals for the following buzzers is maintained:


        • Seat belt warning buzzer

        • Driving with any door opened warning buzzer

        • PKB-ON driving warning buzzer

        • Sliding roof open warning buzzer

      		 -

      1. Combination meter assembly

      2. Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU)

      		 -

      • The following buzzers do not sound:


        • Seat belt warning buzzer

        • Driving with any door opened warning buzzer

        • PKB-ON driving warning buzzer

        • Speed limit exceeded buzzer

      		 -

      1. Combination meter assembly

      2. Center airbag sensor assembly

      		 - The seat belt warning buzzer does not sound. -

      1. Combination meter assembly

      2. Certification ECU (smart key ECU assembly)

      		 -

      • The following buzzers do not sound:


        • Entry key continuous buzzer

        • Entry key intermittent buzzer

      • The status of the signals for the following buzzers is maintained:


        • Entry key single buzzer

        • Immobiliser certification completion buzzer

      		 -

      1. Combination meter assembly

      2. Four wheel drive control ECU

      		 - The 4WD buzzer does not sound. -

      Drive Monitor

      (Performs calculations and displays drive monitor information according to the fuel injection volume and pulse count of the vehicle pulse signal.)

      1. Combination meter assembly

      2. ECM, Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU), Main body ECU (multiplex network body ECU), Air conditioning amplifier assembly, Four wheel drive control ECU, Navigation receiver assembly, Yaw rate sensor assembly

      		 Drive monitor calculations stop and the display is blank. Nothing -

      Multi-display Control

      (Controls the multi-display based on CAN and direct line signals.)

      1. Combination meter assembly

      2. ECM

      		 -

      • The Eco zone is turned off.

      • The status of the dynamic radar cruise control warning signal is maintained.

      • The status of the A/T fluid temperature warning signal is maintained.

      • The status of the DPF message display is maintained.

      		 -

      1. Combination meter assembly

      2. Driving support ECU assembly

      		 - The status of the dynamic radar cruise control warning signal is maintained. -

      1. Combination meter assembly

      2. Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU)

      		 -

      • The status of the CRAWL control display is maintained.

      • The status of the TRC OFF display is maintained.

      • The status of the PKB-ON while driving display is maintained.

      		 -

      1. Combination meter assembly

      2. Seat belt control ECU

      		 - The pre-crash safety system display is turned off. -

      1. Combination meter assembly

      2. Certification ECU (smart key ECU assembly)

      		 -

      • The status of the entry and start system display signal is maintained.

      • The status of the entry unlock mode settings display is maintained.

      		 -

      Multi-display Control

      (Controls the multi-display based on CAN and direct line signals.)

      1. Combination meter assembly

      2. Main body ECU (multiplex network body ECU)

      		 -

      • The security display is turned off.

      • The entry unlock mode settings display:


        • When steering wheel information is not determined: Turned off.

        • When steering wheel information is determined: Performs control using the determined information.

      • The status of the sliding roof warning signal is maintained.

      • The door open indicator:


        • When steering wheel information is not determined: Turned off.

        • When steering wheel information is determined: Status of the display is maintained.

      • When steering wheel information is determined: Status of the display is maintained.

      		 -

      1. Combination meter assembly

      2. Clearance warning ECU assembly

      		 - The status of the clearance sonar display is maintained. -

      1. Combination meter assembly

      2. Blind spot monitor sensor LH

      		 - The status of the blind spot monitor display is maintained. -

      1. Combination meter assembly

      2. Navigation receiver assembly

      		 - The turn-by-turn display turns off maintained. -

      A/C Control

      (Controls the air conditioning according to the engine coolant temperature information, controls the operation according to the viscous heater operation permission information and controls the operation according to the PTC heater operation permission information.)

      1. Air conditioning amplifier assembly

      2. ECM, Combination meter assembly, Navigation receiver assembly, Radio and display receiver assembly, Main body ECU (multiplex network body ECU), Air conditioning amplifier assembly

      • Maintains the current conditions.

      • PTC control does not operate.

      		 Nothing

      • U0100

      • U0142

      • U0155

      • U0163

      Automatic Headlight Beam Level Beam Control System

      (Determines whether the vehicle is accelerating or decelerating according to the vehicle wheel speed and information from the vehicle height sensor and moves the headlights up and down.)

      1. Headlight swivel ECU assembly

      2. ECM, Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU), Spiral cable sub-assembly (steering angle sensor), Main body ECU (multiplex network body ECU)

      • When communication is lost with the skid control ECU: Continues control with the vehicle speed as 0 km/h (0 mph).

      • When communication is lost with a device other than the skid control ECU: Control continues.

      		 The Headlight beam level control system warning light turns on.

      • U0100

      • U0101

      • U0126

      • U0129

      • U0142

      Door Lock

      (Lock/unlock control [operates key-linked function, key lock-in prevention function, etc.])

      1. Main body ECU (multiplex network body ECU)

      2. ECM, Combination meter assembly, Center airbag sensor assembly

      • When communication is lost with the center airbag sensor assembly: The key-linked operation is permitted.

      • When communication is lost with the combination meter assembly:


        • A key lock-in prevention unlock operation is permitted.

        • The speed-sensitive automatic door lock operation is prohibited.

      • When communication is lost with the ECM (engine control signal):


        • The speed-sensitive automatic door lock operation is permitted.

        • The shift-linked automatic door lock operation is permitted.

      • When communication is lost with the ECM (signals related to ECT):


        • The shift-linked automatic door lock operation is prohibited.

        • The shift-linked automatic door unlock operation is prohibited.

      		 Nothing

      • U0100

      • U0101

      • U0151

      • U0155

      Wireless/Entry

      (Wireless/Entry Control [wireless/entry request reception])

      1. Certification ECU (smart key ECU assembly)

      2. Main body ECU (multiplex network body ECU)

      • Entry/wireless control is not performed.

      • Door lock/unlock control is not performed.

      • Entry back door opener control is not performed.

      		 Nothing U0327

      Alarm

      (Sounds various warnings.)

      1. Main body ECU (multiplex network body ECU)

      2. ECM, Power management control ECU

      		 - Nothing

      • U0100

      • U0101

      • U1133

      Lighting Control

      (Performs DRL control)

      1. Main body ECU (multiplex network body ECU)

      2. ECM

      		 DRL control does not operate. Nothing

      • U0100

      • U0101

      Automatic Dimming of Display

      (Controls the display dimming.)

      1. Main body ECU (multiplex network body ECU)

      2. Combination meter assembly

      • When communication is lost with the engine switch off: The display does not dim.

      • When communication is lost with the engine switch on (IG): The status of the display is maintained.

      • Dims the interior display and indicators when the light sensor illuminance signal value is less than the display dimming value.

      		 Nothing U0155

      Illumination

      (Performs illumination control.)

      1. Main body ECU (multiplex network body ECU)

      2. Certification ECU (smart key ECU assembly)

      		 The dome light is turned off. Nothing U0327

      Equipment Related

      (Processes the ambient temperature data and transmits the delayed data to the accessory BERKES remote starter [accessory].)

      1. Main body ECU (multiplex network body ECU)

      2. Air conditioning amplifier assembly

      		 - Nothing U0164

      Seat and Mirror Control

      (Controls the memory function [the seat, steering wheel adjustments].)

      1. Main body ECU (multiplex network body ECU)

      2. Power management control ECU, Certification ECU (smart key ECU assembly), Front power seat switch LH, Multiplex tilt and telescopic ECU

      		 - Nothing

      • U0208

      • U1115

      Lighting Control

      (Controls the automatic high beams.)

      1. Main body ECU (multiplex network body ECU)

      2. Headlight swivel ECU assembly

      		 - Nothing -

      Seat Memory System

      (Controls the seat position according to the operating conditions.)

      1. Front power seat switch LH

      2. ECM, Combination meter assembly, Power management control ECU, Main body ECU (multiplex network body ECU), Multiplex tilt and telescopic ECU

      		 The power tilt and power telescopic steering column system and its memory and restore functions do not operate. Nothing -

      Pre-crash Safety System (Brake-linked Control)

      (Controls the seat belts and brakes during sudden braking or when the vehicle is uncontrollable.)

      1. Seat belt control ECU

      2. Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU), Center airbag sensor assembly

      		 Pre-crash safety system brake-linked control stops. The PCS indicator light blinks.

      • U0122

      • U0140

      • U0151

      Pre-crash Safety System (Millimeter wave radar sensor-linked control)

      (Controls the seat belts and brakes when a crash is unavoidable.)

      1. Seat belt control ECU

      2. Center airbag sensor assembly, Driving support ECU assembly

      		 Pre-crash safety system millimeter wave radar sensor-linked control stops. The PCS indicator light blinks.

      • U0140

      • U0151

      • U1104

      Meter Display Request

      (Requests indicator display on the combination meter upon reception of information indicating a malfunction in the seat belt control ECU or driving support ECU.)

      1. Seat belt control ECU

      2. Driving support ECU assembly

      		 Control stops. The PCS indicator light illuminates. -

      ACC

      (Accelerates or decelerates the vehicle to maintain the distance to the vehicle ahead.)

      1. Driving support ECU assembly

      2. ECM, Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU), Spiral cable sub-assembly (steering angle sensor), Yaw rate sensor assembly, Combination meter assembly, Main body ECU (multiplex network body ECU)

      		 The ACC system does not operate. A message indicating system cancellation is displayed and the buzzer sounds.

      • U0122

      • U0123

      • U0126

      • U1104

      Pre-crash Safety System

      (Controls the seat belts and brakes immediately before a crash.)

      1. Driving support ECU assembly

      2. Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU), Spiral cable sub-assembly (steering angle sensor), Yaw rate sensor assembly, Main body ECU (multiplex network body ECU), Combination meter assembly

      		 The pre-crash safety system does not operate. The light blinks and the buzzer sounds.

      • U0122

      • U0123

      • U0126

      • U1100

      • U1104

      Engine-related Indicators

      (The system estimates the oil deterioration level and the indicators on the meter indicate that an oil change is necessary, etc.)

      1. ECM

      2. Combination meter assembly

      • The indicator lights do not turn on.

      • The meter display cannot be cleared.

      		 The engine-related indicator lights do not turn on. -

      Electrical Load Control

      (Performs idle up according to the electrical load.)

      1. ECM

      2. ECM, Main body ECU (multiplex network body ECU), Air conditioning amplifier assembly

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

      Air Conditioning-linked Control

      (Performs idle up according to the compressor load.)

      1. ECM

      2. Power management control ECU, Air conditioning amplifier assembly

      		 Air conditioning-linked control does not operate. The air conditioning does not operate. -

      PTC Heater

      (Performs idle up according to requests from the PTC heater or heater system.)

      1. ECM

      2. ECM, Air conditioning amplifier assembly

      		 The PTC heater does not operate. The idle speed changes and heater performance deteriorates. -

      Charging Control

      (Performs idle up according to charging requests.)

      1. Power management control ECU

      2. ECM, Power management control ECU

      		 Idle up according to charging requests is not performed. Nothing -

      Eco Driving Indicator

      (Displays information to the driver to encourage "eco driving".)

      1. ECM

      2. Combination meter assembly

      • The indicator light does not turn on.

      • The display of all information stops.

      		 The eco driving indicator light does not turn on. -

      Integrated Control (VSC)

      (Estimates the driver requested torque based on 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. Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU), Spiral cable sub-assembly (steering angle sensor), Yaw rate sensor assembly, Driving support ECU assembly

      		 Integrated control is not performed. Nothing -

      ECT System Indicators

      (Indicate the shift position, states of switches, system modes, etc.)

      1. ECM

      2. Combination meter assembly

      		 - ECT system indicator lights do not turn on. -

      AI-SHIFT Control

      (Controls the A/T in order to improve engine braking power and acceleration feeling.)

      1. ECM

      2. ECM, Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU)

      		 AI-SHIFT control does not operate. Nothing -

      Coast Downshift

      (Changes the coast downshift point based on the air conditioning load and performs upshift delay according to air conditioning or heater requests.)

      1. ECM

      2. ECM, Air conditioning amplifier assembly

      		 Coast downshift shock becomes stronger. Coast downshift shock becomes stronger. -

      Cruise Control

      (Adjusts the engine throttle valve opening amount automatically to maintain the vehicle speed.)

      1. ECM, Driving support ECU assembly

      2. ECM, Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU), Combination meter assembly, Driving support ECU assembly

      		 Cruise control does not operate.

      • w/o Multi-information Display: The cruise indicator light blinks.

      • w/ Multi-information Display: The "Check cruise control system" message is displayed.

      		 -

      TC DTC Output Service

      (Outputs a DTC in response to a DTC output request from the combination meter.)

      1. Combination meter assembly

      2. ECM, Center airbag sensor assembly

      		 The TC service function stops. Nothing -

      Event Data Recorder (EDR)

      (Records conditions such as the vehicle speed, the amount the accelerator pedal is depressed, and the shift lever position when the event data recorder recording conditions are met.)

      1. Center airbag sensor assembly

      2. ECM, Combination meter assembly

      		 - Nothing -

      SRS Warning Light Control

      (Turns the warning light on/off.)

      1. Combination meter assembly

      2. Center airbag sensor assembly

      		 The SRS warning light turns on. The SRS warning light turns on. -

      Collision Detection Signal (for Fuel-cut)

      (Notifies the system of a collision in order to perform fuel-cut when a vehicle collision occurs.)

      1. ECM

      2. Center airbag sensor assembly

      		 The fuel-cut function used when a collision occurs is stopped. Nothing -

      Seat Belt Warning Light Control

      (Turns the seat belt warning light on/off.)

      1. Combination meter assembly, Main body ECU (multiplex network body ECU)

      2. Center airbag sensor assembly

      		 The seat belt warning light does not operate. Nothing -

      Multi-function Switch

      (Operates the clearance sonar switch, 2nd start switch and blind spot monitor switch using the steering switch.)

      1. Driving support switch control ECU

      2. Combination meter assembly, Headlight swivel ECU assembly, Blind spot monitor sensor LH

      		 - Nothing -

      Multi-terrain Select

      (Informs the user of the recommended vehicle state according to driving conditions.)

      1. Driving support switch control ECU

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

      • Mode switching is not possible.

      • The display of text messages in the meter display is not possible.

      		 - -

      Parking Assist Monitor Switching

      (Changes the camera and image quality for the park assist monitor system.)

      1. Parking assist ECU

      2. -

      • Camera switching is not possible.

      • Changing the brightness and contrast of the display is not possible.

      		 Nothing -

      Crawl Control Switch

      (Sends the crawl control switch information.)

      1. Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU)

      2. Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU)

      		 - Nothing -

      Push Start (Power Source Switching)

      (Changes the power source mode automatically based on the push start switch signal and commands the starter to operate when certain conditions are met.)

      1. Power management control ECU

      2. ECM, Combination meter assembly, Main body ECU (multiplex network body ECU)

      		 Does not display the necessary starting operation commands. Nothing U0100

      Charging Control

      (Changes the amount of voltage generated by the alternator according to the driving state of the vehicle and battery capacity.)

      1. Power management control ECU

      2. ECM

      		 - Nothing -

      Engine Start Control

      (Prohibits and permits turning on the starter according to the vehicle state and start request signals.)

      1. Power management control ECU

      2. ECM

      		 - Nothing U0100

      Blind Spot Monitor

      (Warns the driver when the system detects a vehicle in the blind spots of the outer mirrors.)

      1. Blind spot monitor sensor LH

      2. ECM, Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU), Main body ECU (multiplex network body ECU), Spiral cable sub-assembly (steering angle sensor), Blind spot monitor sensor LH

      		 - Blind spot monitor system warning displayed.

      • U0100

      • U0126

      • U0129

      • U0142

      Clearance Sonar Setting / Notification

      (Controls the settings for the clearance sonar screen notifications which are set by operating the touch switches of the multi-display, displays the sonar status and plays voice warnings.)

      1. Navigation receiver assembly, Radio and display receiver assembly

      2. ECM, Clearance warning ECU assembly

      • If a communication stop occurs while the clearance sonar settings screen is displayed, the settings screen is cleared.

      • If a communication stop occurs while the clearance sonar sensor screen is displayed, the sensor screen is cleared.

      • The "TOYOTA Park Assist" icon which is displayed on the vehicle settings screen is cleared.

      • The screen does not change to the camera screen (the clearance sonar screen does not display on the camera screen.)

      • U0073

      • U0100

      • U1110

      Eco Navigation Display

      (Displays the fuel consumption in 1 minute intervals, and displays the average fuel consumption history.)

      1. Navigation receiver assembly

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

      • Stops updating the fuel consumption displayed in 1 minute intervals on the eco navigation (eco drive) display (the graph of fuel consumption in 1 minute intervals that was displayed up until the point of the malfunction is not cleared).

      • Stops updating the average fuel consumption history on the eco navigation (eco drive display).

      • If the distance to empty is displayed on the eco navigation (eco drive display), the numbers of the display indicating the distance to empty are cleared because distance to empty data is lost.

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

      • The most recent value for the fuel consumption interval graph on the eco navigation (eco drive) screen is cleared.

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

      • U0100

      • U0129

      • U0155

      Parking Assist Control

      (Displays the guide lines based on the steering sensor, vehicle speed and vehicle information.)

      1. Navigation receiver assembly

      2. ECM, Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU)

      • If a communication stop occurs when the expected course lines are being displayed, the expected course lines are cleared and "Guidance unavailable" is displayed on the bottom of the screen.

      • If a communication stop occurs when the display is in parallel parking guide mode, "Guidance unavailable" is displayed on the bottom of the screen.

      • If a communication stop occurs when the expected course lines are being displayed, the expected course lines are cleared and "Guidance unavailable" is displayed on the bottom of the screen.

      • If a communication stop occurs when the display is in parallel parking guide mode, "Guidance unavailable" is displayed on the bottom of the screen.

      • When the shift lever is moved to R and the camera screen is being displayed, a place other than the rear of the vehicle is displayed.

      • The screen does not change to the camera screen.

      • U0100

      • U0129

      Destination Determination

      (Determines the destination based on the destination symbol and destination package information and selects the display language, time zone, etc.)

      1. Navigation receiver assembly, Radio and display receiver assembly

      2. Main body ECU (multiplex network body ECU)

      		 Determines the destination according to the last received value and operates accordingly (if there is no last received value, the system operates using the default value). The time zone and language selection screens do not match the destination. U0140

      Vehicle Customize Function

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

      1. Navigation receiver assembly

      2. Air conditioning amplifier assembly, Certification ECU (smart key ECU assembly), Main body ECU (multiplex network body ECU), Multiplex tilt and telescopic ECU, Front power seat switch LH

      • When a phase 4 remote communication usage application is performed (customize or remote diagnosis), the information is processed regardless of whether the BDB ECU has permitted or prohibited remote communication.

      • 3 retries are performed (including the first time).

      		 The customize options for items related to the ACN, BDB, IDT, DST and TAT ECU are not displayed or the settings cannot be saved.

      • U0073

      • B15F5

      • B15F6

      • B15F7

      • B15F8

      Time Stamp Function

      (Matches the relative time from the main body ECU with the absolute time acquired from the GPS.)

      1. Main body ECU (multiplex network body ECU)

      2. Main body ECU (multiplex network body ECU)

      		 - Nothing

      • U0073

      • U0140

      Rear View Monitor Control

      (Rear view control displays the back camera view.)

      1. Navigation receiver assembly, Radio and display receiver assembly

      2. ECM

      		 - The screen does not change to the camera screen. U0100

      Meter-linked Function

      (Changes display based on customization information set through the meter. Outputs the customization information set in the system.)

      1. Navigation receiver assembly, Radio and display receiver assembly

      2. Combination meter assembly

      		 Maintains the last valid state. - -

      ERA-GLONASS

      (Sends position location to the emergency call center and calls an operator when the system detects that an airbag has been deployed or the button is pressed.)

      1. Telematics transceiver

      2. ECM

      		 When CAN communication is lost, registration requests from the GTS are denied. Nothing U0100