Can Communication System (For Rhd Without Entry And Start System) Fail-Safe Chart

  1. FAIL-SAFE FUNCTION

Can Communication System (For Rhd Without Entry And Start System) -- Fail-Safe Chart



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
    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)
    1. Power steering back-up control
    2. 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)
    1. Power steering back-up control
    2. 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
    1. Power steering back-up control
    2. 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
    		-
    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, Brake actuator assembly (skid control ECU), Master cylinder solenoid (skid control ECU)
    		High-Low switching is prohibited.
    		The 4WD 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. Brake actuator assembly (skid control ECU), Master cylinder solenoid (skid control ECU)
    		Prohibits center differential lock switching.
    		The 4WD 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. ECM
    2. Brake actuator assembly (skid control ECU), Master cylinder solenoid (skid control ECU)
    		Rear differential lock switching is prohibited.
    		The 4WD indicator light blinks.
    		-
    L4F Switching Limitation
    (Prohibits switching to L4F when VSC is malfunctioning.)
    1. Four wheel drive control ECU
    2. Brake actuator assembly (skid control ECU), Master cylinder solenoid (skid control ECU)
    		L4F switching is prohibited.
    		The 4WD 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, Brake actuator assembly (skid control ECU), Master cylinder solenoid (skid control ECU)
    		When all 4 wheels are malfunctioning, switching is prohibited.
    		The indicator lights blink quickly.
    		-
    Indicator/Buzzer Signal Output
    (Outputs a signal indicating the indicator and buzzer state, which are 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 switch is malfunctioning.)
    1. Four wheel drive control ECU
    2. ECM, Brake actuator assembly (skid control ECU), Master cylinder solenoid (skid control ECU), Combination meter assembly
    		State signal update is not possible.
    		The indicator lights blink quickly.
    		-
    L4 State Signal Output
    (Outputs a signal when switching to the L4 position is finished.)
    1. Four wheel drive control ECU
    2. Brake actuator assembly (skid control ECU), Master cylinder solenoid (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 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.
    		-
    ABS
    (Prevents the wheels from locking when stopping suddenly.)
    1. Brake actuator assembly (skid control ECU), Master cylinder solenoid (skid control ECU)
    2. Yaw rate sensor assembly
    		The ABS does not operate.
    		The light illuminates.
    1. U0073
    2. U0114
    3. U0124
    TRC
    (Prevents instability when accelerating from a stop.)
    1. Master cylinder solenoid (skid control ECU)
    2. ECM, Spiral cable sub-assembly (steering angle sensor), Yaw rate sensor assembly
    		TRC does not operate.
    		The light illuminates.
    1. U0073
    2. U0100
    3. U0114
    4. U0123
    5. U0124
    6. U0126
    VSC
    (Suppresses instability such as drift when cornering.)
    1. Master cylinder solenoid (skid control ECU)
    2. ECM, Spiral cable sub-assembly (steering angle sensor), Yaw rate sensor assembly
    		VSC does not operate.
    		The light illuminates.
    1. U0073
    2. U0100
    3. U0114
    4. U0123
    5. U0124
    6. U0126
    Steering Sensor
    (Detects the steering wheel angle.)
    1. Spiral cable sub-assembly (steering angle sensor)
    2. Master cylinder solenoid (skid control ECU)
    		-
    		The VSC indicator light turns on.
    		-
    Speedometer
    (Controls the speedometer according to the vehicle speed signals.)
    1. Combination meter assembly
    2. Brake actuator assembly (skid control ECU), Master cylinder solenoid (skid control ECU)
    		0 km/h (0 mph) is indicated.
    		Nothing
    		-
    Tachometer
    (Controls the tachometer according to the engine speed signals.)
    1. Combination meter assembly
    2. ECM
    		0 rpm is indicated.
    		Nothing
    		-
    Engine Coolant Temperature Gauge
    (Controls the temperature 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 Gauge
    (Controls the fuel gauge according to the vehicle condition determined by the ST signal, vehicle speed signal and fuel amount.)
    1. Combination meter assembly
    2. ECM, Brake actuator assembly (skid control ECU), Master cylinder solenoid (skid control ECU)
    1. When communication is lost with the main body ECU:
      1. Operates with the parking brake released.
      2. Ignition switch is off.
    2. When communication is lost with a device other than the main body ECU:
      1. Operates the same as when the vehicle is stopped.
      2. 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. Brake actuator assembly (skid control ECU), Master cylinder solenoid (skid control ECU)
    		The calculation stops and the last displayed value remains.
    		Nothing
    		-
    Telltale
    (Controls indicator illumination and blinking according to the CAN signals and direct line input signals.)
    1. Combination meter assembly
    2. Center airbag sensor assembly
    		-
    1. The SRS warning light illuminates.
    2. The status of the front passenger side seat belt warning light is maintained.
    		-
    1. Combination meter assembly
    2. Main body ECU (multiplex network body ECU)
    		-
    1. The status of the following indicators (warning lights) is maintained when the ignition switch is ON and turn off when the ignition switch is turned off:
      1. Beam indicator light
      2. HEAD indicator light
      3. Tail indicator light
      4. Open door warning light
      5. Driver side seat belt warning light
      6. Brake warning light
      7. Front fog indicator light
      8. Rear fog indicator light
    		-
    Telltale
    (Controls indicator illumination and blinking according to the CAN signals and direct line input signals.)
    1. Combination meter assembly
    2. ECM
    		-
    1. The status of the following indicators (warning lights) is maintained when the ignition switch is ON and turn off when the ignition switch is turned off:
      1. Glow indicator light
      2. Cruise main indicator light
      3. Cruise set indicator light
    		-
    1. Combination meter assembly
    2. Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU)
    		-
    1. The following indicators (warning lights) turn on:
      1. Brake warning light
      2. ABS warning light
    2. The status of the following indicators (warning lights) is maintained when the ignition switch is ON and turn off when the ignition switch is turned off:
      1. VSC OFF indicator light
      2. CRAWL indicator light
    3. The slip indicator light turns on or the indicator status is maintained (when the ignition switch is turned to ON).
    		-
    1. Combination meter assembly
    2. Four wheel drive control ECU
    		-
    1. The status of the following indicators (warning lights) is maintained when the ignition switch is ON and turn off when the ignition switch is turned off:
      1. Center differential lock indicator
      2. 4LO indicator light
    		-
    Buzzers
    (Controls the buzzer sounding according to the CAN signals and direct line input signals.)
    1. Combination meter assembly
    2. Main body ECU (multiplex network body ECU)
    		-
    1. The status of the signals for the following buzzers is maintained:
      1. Seat belt warning buzzer
      2. Driving with any door opened warning buzzer
      3. PKB-ON driving warning buzzer
      4. Sliding roof open warning buzzer
    		-
    1. Combination meter assembly
    2. Master cylinder solenoid (skid control ECU), Brake actuator assembly (skid control ECU)
    		-
    1. The following buzzers do not sound:
      1. Seat belt warning buzzer
      2. Driving with any door opened warning buzzer
      3. PKB-ON driving warning buzzer
    		-
    1. Combination meter assembly
    2. Center airbag sensor assembly
    		-
    		The seat belt warning buzzer does not sound.
    		-
    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), Main body ECU (multiplex network body ECU)
    		The drive monitor calculations stop and the display is blank.
    		Nothing
    		-
    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, Radio and display receiver assembly, Main body ECU (multiplex network body ECU), Air conditioning amplifier assembly
    1. Maintains the current conditions.
    2. PTC control does not operate.
    		Nothing
    1. U0100
    2. U0163
    3. U0142
    4. U0155
    Door Lock (Key-linked Function, Key Lock-in Prevention Function, etc.)
    (Performs lock/unlock control.)
    1. Main body ECU (multiplex network body ECU)
    2. ECM, Combination meter assembly, Center airbag sensor assembly
    1. When communication is lost with the center airbag sensor assembly: The key-linked operation is permitted.
    2. When communication is lost with the combination meter assembly:
      1. A key lock-in prevention unlock operation is permitted.
      2. The speed-sensitive automatic door lock operation is prohibited.
    3. When communication is lost with the ECM (engine control signal):
      1. The speed-sensitive automatic door lock operation is permitted.
      2. The shift-linked automatic door lock operation is permitted.
    4. When communication is lost with the ECM (signals related to ECT):
      1. The shift-linked automatic door lock operation is prohibited.
      2. The shift-linked automatic door unlock operation is prohibited.
    		Nothing
    1. U0100
    2. U0101
    3. U0151
    4. U0155
    Alarm
    (Sounds warnings.)
    1. Main body ECU (multiplex network body ECU)
    2. ECM
    		-
    		Nothing
    1. U0100
    2. U0101
    Illumination Control
    (Controls the daytime running lights.)
    1. Main body ECU (multiplex network body ECU)
    2. ECM
    		Control is not performed.
    		Nothing
    1. U0100
    2. U0101
    Display Automatic Dimming
    (Controls display dimming control.)
    1. Main body ECU (multiplex network body ECU)
    2. Combination meter assembly
    1. When communication is lost with the ignition switch off: The display does not dim.
    2. When communication is lost with the ignition switch ON: The status of the display is maintained.
    		Nothing
    		U0155
    Equipment Related
    (Processes the ambient temperature data and transmits the data to the remote start [equipment] of the BERKES equipment as a back-up.)
    1. Main body ECU (multiplex network body ECU)
    2. Air conditioning amplifier assembly
    		-
    		Nothing
    		U0164
    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
    1. The indicator lights do not turn on.
    2. The meter display cannot 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. Air conditioning amplifier assembly
    		Air conditioning-linked control does not operate.
    		The air conditioning does not operate.
    		-
    Eco Driving Indicator
    (Displays information to the driver to encourage "eco driving".)
    1. ECM
    2. Combination meter assembly
    1. The indicator light does not turn on.
    2. 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. ECM, Master cylinder solenoid (skid control ECU), Spiral cable sub-assembly (steering angle sensor), Yaw rate sensor 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)
    		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 does not operate.
    		Coast downshift shock becomes stronger.
    		-
    TC DTC Output Service
    (Outputs a DTC in response to a DTC output request from MET.)
    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
    		-
    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. Radio and display receiver assembly
    2. ECM, Clearance warning ECU assembly
    1. If a communication stop occurs while the clearance sonar settings screen is displayed, the settings screen is cleared.
    2. If a communication stop occurs while the clearance sonar sensor screen is displayed, the sensor screen is cleared.
    1. The "LEXUS Park Assist" icon which is displayed on the vehicle settings screen is cleared.
    2. The screen does not change to the camera screen (the clearance sonar screen does not display on the camera screen.)
    1. U0073
    2. U0100
    3. U1110
    Destination Determination
    (Determines the destination based on the destination symbol and destination package information and selects the display language, time zone, etc.)
    1. 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
    Rear View Monitor Control
    (Rear view control displays the back camera view.)
    1. Radio and display receiver assembly
    2. ECM
    		-
    		Nothing
    		U0100
    Meter-linked Function
    (Changes display based on customization information set through the meter. Outputs the customization information set in the system.)
    1. Radio and display receiver assembly
    2. Combination meter assembly
    		Maintains the last valid state.
    		Nothing
    		-
    TOYOTA parking assist-sensor system
    (Receives detection information from the sensors and displays warnings and sounds buzzers depending on the distance detected.)
    1. Clearance warning ECU assembly
    2. ECM, Combination meter assembly, Radio and display receiver assembly, Main body ECU (multiplex network body ECU), Air conditioning amplifier assembly
    		Object detection stops.
    		Nothing
    1. U0100
    2. U0101
    3. U0155
    Gateway System
    (Monitors the data transmitted between the V1 bus and V2 bus 2 and the ECUs connected to the V2 bus.)
    1. Network gateway ECU
    2. Clearance warning ECU assembly
    		When communication with all the ECUs that are connected to the sub bus is lost, the communication software, which includes information on the gateway, and the CAN controller are reset, and the frames collected in the gateway are discarded.
    		Nothing
    1. U1002
    2. U1110