LIGHTING SYSTEM FAIL-SAFE CHART


  1. HID HEADLIGHT SYSTEM

    The light control ECU operates in fail-safe mode if an abnormal condition such as those listed below has been detected.

    Item Outline
    Detection of abnormal input voltage (High input voltage) If voltage that is input to the light control ECU is approximately 20 V or more, the ECU stops illuminating the headlights, and resumes when the voltage drops to 16 V or less.
    Detection of abnormal input voltage (Low input voltage) If voltage that is input to the light control ECU is 6 V or less, the ECU stops illuminating the low beam headlights, and resumes when the voltage becomes 10 V or more.

    Detection of abnormal output


    • Open in output side circuit

    • Short between output terminals

    • Short between output terminal and body ground

    		 If an abnormal condition occurs in the voltage that is output by the light control ECU, the ECU stops illuminating the low beam headlights and will maintain this state until the power is reinstated (by turning the light control switch from off to head position).
    Detection of abnormal light voltage (Low light voltage) Approximately 80 seconds after input voltage is supplied, if the light voltage is below approximately 31 V for approximately 0.5 seconds, the light control ECU stops illuminating the low beam headlights and will maintain this state until the power is reinstated (by turning the light control switch from off to head position).
    Detection of abnormal light voltage (High light voltage) If the light voltage is above approximately 69 V for approximately 0.5 seconds, the light control ECU stops illuminating the low beam headlights and will maintain this state until the power is reinstated (by turning the light control switch from off to head position).

  2. LED HEADLIGHT SYSTEM

    The light control ECU operates in fail-safe mode if an abnormal condition such as those listed below has been detected.

    Item Abnormality Detection Condition Return Condition Master Warning Light Multi-information Display
    Abnormal input voltage (High input voltage) Abnormal power source voltage (more than 17 V) is detected. Normal power source voltage (10 to 16 V) is detected. Flashes CHECK HEADLIGHT SYSTEM
    Abnormal input voltage (Low input voltage) Abnormal power source voltage (less than 10 V) is detected. Normal power source voltage (10 to 16 V) is detected. Flashes CHECK HEADLIGHT SYSTEM
    Abnormal output

    • Open in output side circuit

    • Short between output terminal and body ground

    		 Light control switch is turned off. Flashes CHECK HEADLIGHT SYSTEM

  3. AUTOMATIC LIGHT CONTROL SYSTEM

    If the main body ECU (multiplex network body ECU) detects a malfunction in the automatic light control sensor, the main body ECU (multiplex network body ECU) performs fail-safe control to prohibit the automatic light control. If the low beam headlights and taillights are on, the lights will remain on until the light control switch is turned off.

  4. AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM

    If the AFS ECU (headlight swivel ECU assembly) detects a malfunction in the automatic headlight beam level control system or AFS, it will take the actions indicated in the table below.

    Item Fail-safe Control for Automatic Headlight Beam Level Control Return Condition AFS OFF Indicator Light
    Headlight Swivel Motor Malfunction (LIN Communication malfunction) Continues control until a position that is 0.65° less than the current position is reached. Normal LIN communication signal is detected. Flashes
    Headlight Swivel Motor Malfunction (Open, Short or Over Heat) Continues control until a position that is 0.65° less than the current position is reached. Power switch is turned on (IG) again. Flashes
    Headlight Swivel Motor Malfunction (Voltage Malfunction) Continues control until a position that is 0.65° less than the current position is reached. Normal condition is detected for 200 ms consecutively. Not illuminated
    Headlight Swivel Motor Gear Malfunction Continues control until a position that is 0.65° less than the current position is reached. Gear position change is detected. Flashes
    Headlight Leveling Motor Malfunction (LIN Communication malfunction)

    Normal Side Headlight Leveling Motor


    • Stops the operation after returning to the initial position (Fail at higher than the initial position).

    • Stops at the current position (Fail at lower than the initial position).

    		 Normal LIN communication signal is detected. Flashes

    Abnormal Side Headlight Leveling Motor


    • Stops the operation after returning to the initial position (Fail at higher than the initial position).

    • Stops at the current position (Fail at lower than the initial position).
    Headlight Leveling Motor Malfunction (Open, Short or Over Heat)

    Normal Side Headlight Leveling Motor


    • Stops the operation after returning to the initial position (Fail at higher than the initial position).

    • Stops at the current position (Fail at lower than the initial position).

    		 Power switch is turned on (IG) again. Flashes

    Abnormal Side Headlight Leveling Motor


    • Stops at the current position.
    Headlight Leveling Motor Malfunction (Voltage Malfunction)

    Normal Side Headlight Leveling Motor


    • Stops the operation after returning to the initial position (Fail at higher than the initial position).

    • Stops at the current position (Fail at lower than the initial position).

    		 Normal condition is detected for 200 ms consecutively. Not illuminated
    Steering Angle Sensor Signal Malfunction Continues control. Power switch is turned on (IG) again. Flashes
    Steering Angle Sensor Zero Point Memory Invalid Continues control. Steering angle sensor zero point memory valid is detected. Not illuminated
    Steering Angle Sensor Data Continuity Invalid Continues control. Steering angle sensor data continuity invalid flag is detected. Not illuminated
    Speed Sensor Signal Malfunction

    • Continues to control using the normal speed sensor signal if one signal fails.

    • Judges that the vehicle speed is 0 km/h (0 mph) and continues to control if both speed sensor signals fail.

    		 Normal condition is detected. Flashes
    Height Control Sensor Pitch Angle Malfunction (w/ Air Suspension System)

    • Stops the operation after returning to the initial position (Fail at more than 0.2% higher than the initial position).

    • Stops the operation after returning to the 0.2% lower than current position (Fail at more than 0.2% lower than the initial position).

    		 Normal condition is detected 2 times consecutively. Flashes
    Height Control Sensor Power Source Malfunction (w/o Air Suspension System)

    • Stops the operation after returning to the initial position (Fail at higher than the initial position).

    • Stops the operation at the current position (Fail at lower than the initial position).

    		 Power switch is turned on (IG) again. Flashes
    Height Control Sensor Power Source Malfunction (w/ Air Suspension System)

    • Stops the operation after returning to the initial position (Fail at more than 0.2% higher than the initial position).

    • Stops the operation after returning to the 0.2% lower than current position (Fail at more than 0.2% lower than the initial position).

    		 Power switch is turned on (IG) again. Flashes
    Rear Height Control Sensor Signal Malfunction (w/o Air Suspension System)

    • Stops the operation after returning to the initial position (Fail at higher than the initial position).

    • Stops the operation at the current position (Fail at lower than the initial position).

    		 Normal signal is detected 4 times consecutively. Flashes
    Rear Height Control Sensor Signal Malfunction (w/ Air Suspension System)

    • Stops the operation after returning to the initial position (Fail at more than 0.2% higher than the initial position).

    • Stops the operation after returning to the 0.2% lower than current position (Fail at more than 0.2% lower than the initial position).

    		 Normal signal is detected 4 times consecutively. Flashes
    Front Height Control Sensor Signal Malfunction (w/ Air Suspension System)

    • Stops the operation after returning to the initial position (Fail at more than 0.2% higher than the initial position).

    • Stops the operation after returning to the 0.2% lower than current position (Fail at more than 0.2% lower than the initial position).

    		 Normal signal is detected 4 times consecutively. Flashes
    CAN Communication Malfunction

    Skid Control ECU


    • Judges that the vehicle speed is 0 km/h (0 mph) and continues control.

    		 Normal CAN communication is detected. Flashes

    Steering Angle Sensor


    • Normally controls the system.

    ECM


    • Continues control.

    Main Body ECU


    • Continues control.
    AFS ECU Malfunction Continues control. Power switch is turned on (IG) again. Flashes
    Height Control Sensor Initialization not be performed Locked. Initialization is finished. Flashes
    Height Control Sensor Data Malfunction when Initializing Locked. Initialization is finished. Flashes
    Vehicle Information not be synchronized Locked. Initialization is finished. Flashes
    Variation Error Locked. Variation is normal. Flashes

  5. AFS

    If the AFS ECU (headlight swivel ECU assembly) detects a malfunction in the AFS or automatic headlight beam level control system, it will take the actions indicated in the table below.

    Item Fail-safe Control for AFS Control Return Condition AFS OFF Indicator Light
    Headlight Swivel Motor Malfunction (LIN Communication malfunction)

    Normal Side Headlight Swivel Motor


    • Stops operating after returning to the initial position.

    		 Normal LIN communication signal is detected. Flashes

    Abnormal Side Headlight Swivel Motor


    • Stops operating after returning to the initial position.
    Headlight Swivel Motor Malfunction (Open, Short or Over Heat)

    Normal Side Headlight Swivel Motor


    • Stops operating after returning to the initial position.

    		 Power switch is turned on (IG) again. Flashes

    Abnormal Side Headlight Swivel Motor


    • Stops at the current position.
    Headlight Swivel Motor Malfunction (Voltage Malfunction)

    Normal Side Headlight Swivel Motor


    • Stops operating after returning to the initial position.

    		 Normal condition is detected for 200 ms consecutively. Not illuminated

    Abnormal Side Headlight Swivel Motor


    • Stops at the current position.
    Headlight Swivel Motor Gear Malfunction

    Normal Side Headlight Swivel Motor


    • Stops operating after returning to the initial position.

    		 Gear position change is detected. Flashes

    Abnormal Side Headlight Swivel Motor


    • Stops at the current position.
    Headlight Leveling Motor Malfunction (LIN Communication malfunction) Stops operating after returning to the initial position. Normal LIN communication signal is detected. Flashes
    Headlight Leveling Motor Malfunction (Open, Short or Over Heat) Stops operating after returning to the initial position. Power switch is turned on (IG) again. Flashes
    Headlight Leveling Motor Malfunction (Voltage Malfunction) Stops operating after returning to the initial position. Normal condition is detected for 200 ms consecutively. Not illuminated
    Steering Angle Sensor Signal Malfunction Stops operating after returning to the initial position. Power switch is turned on (IG) again. Flashes
    Steering Angle Sensor Zero Point Memory Invalid Stops operating after returning to the initial position. Steering angle sensor zero point memory valid is detected. Not illuminated
    Steering Angle Sensor Data Continuity Invalid Stops operating after returning to the initial position. Steering angle sensor data continuity invalid flag is detected. Not illuminated
    Speed Sensor Signal Malfunction Stops operating after returning to the initial position. Normal condition is detected. Flashes
    Height Control Sensor Pitch Angle Malfunction (w/ Air Suspension System) Stops operating after returning to the initial position. Normal condition is detected for 2 times consecutively. Flashes
    Height Control Sensor Power Source Malfunction (w/o Air Suspension System) Stops operating after returning to the initial position. Power switch is turned on (IG) again. Flashes
    Rear Height Control Sensor Signal Malfunction Stops operating after returning to the initial position. Normal signal is detected 4 times consecutively. Flashes
    Rear Height Control Sensor Signal Malfunction Stops operating after returning to the initial position. Normal signal is detected 4 times consecutively. Flashes
    CAN Communication Malfunction Stops operating after returning to the initial position or continues control. Normal CAN communication is detected. Flashes
    AFS ECU Malfunction Stops operating after returning to the initial position. Power switch is turned on (IG) again. Flashes
    Height Control Sensor Initialization not be performed Stops operating after returning to the initial position. Initialization is finished. Flashes
    Height Control Sensor Data Malfunction when Initializing Stops operating after returning to the initial position. Initialization is finished. Flashes
    Vehicle Information not be synchronized Stops operating after returning to the initial position. Initialization is finished. Flashes
    Variation Error Stops operating after returning to the initial position. Variation is normal. Flashes