LANE DEPARTURE ALERT SYSTEM CONTROL LANE DEPARTURE ALERT CONTROL

  1. FUNCTION OF MAIN COMPONENTS

    Components

    Function

    Combination Meter Assembly

    LDA Indicator Light

    • Illuminates or turns off in accordance with signals from the pre-collision city sensor.

    • Displays a white lines to inform or warn the driver of the system condition in accordance with signals from the pre-collision city sensor.

    • Illuminates to warn the driver in accordance with signals from the pre-collision city sensor.

    Buzzer

    Sounds to warn the driver of the system condition in accordance with signals from the pre-collision city sensor.

    Pre-collision City Sensor

    • Captures a view of the road ahead of the vehicle and detects lane markers on the driving lane, and calculates the radius to the center of the lane, lane width, distance from markers and heading angle deviation.

    • Controls the lane departure alert system.

    • Transmits the indicator illumination request signal and buzzer sound request signal to the combination meter assembly.

    ECM

    Sends a shift position R signal to the pre-collision city sensor.

    Brake Actuator Assembly

    Skid Control ECU

    Sends a vehicle speed signal from the speed sensor to the pre-collision city sensor.

    Steering Pad Switch Assembly

    Lane Departure Alert Switch

    Detects an on/off status of the system and transmits a signal to the pre-collision city sensor.

    Spiral Cable Sub-assembly

    Steering Sensor

    Detects the steering direction and angle of the steering wheel.

    Airbag Sensor Assembly

    Yawrate Sensor

    Detects yaw rate and transmits a signal to the pre-collision city sensor.

    Speed Sensor

    Transmits a vehicle speed signal to the skid control ECU.

  2. SYSTEM CONTROL

    1. Operating Conditions of Lane Departure Alert System

      Operation

      Condition

      Operating/Resume

      The lane departure alert system is activated when all of the following conditions are met:

      • The lane departure alert switch is on. (When the lane departure alert switch is pressed to turn on the lane departure alert system, the LDA indicator light illuminates.)

      • The vehicle speed is approximately 50 km/h (32 mph) or more.

      • Lane markers are detected.

      • No turn signal command is detected.

      • System malfunction is not detected.

      Suspended

      The lane departure alert system is suspended when any one of the following conditions is met:

      • The vehicle speed is less than approximately 50 km/h (32 mph) .

      • A turn signal command is detected.

      • No lane markers are detected.

      • Immediately after the lane departure warning is activated.

      • The temperature of the pre-collision city sensor is abnormal.

      Canceled

      The lane departure alert system is stopped when any one of the following conditions is met:

      • The lane departure alert switch is off.

      • The lane departure alert system is malfunctioning.

      The lane departure alert system resumes when the following conditions are met:

      • The conditions to start operation listed above are satisfied.

      • The lane departure alert system condition returns to normal.

      • The engine switch is turned off and on (IG) again to ensure normal operation, after the lane departure alert system has been stopped by a system malfunction.

  3. DIAGNOSIS

    1. If a malfunction is detected in the lane departure alert system, the pre-collision city sensor cancels the lane departure alert system, illuminates the LDA indicator light in yellow in the combination meter assembly to inform the driver of the malfunction.

    2. At the same time, the malfunction is stored in memory as a Diagnostic Trouble Code (DTC). When a Global TechStream (GTS) is connected to the DLC3, the DTC can be read. For details, refer to the Repair Manual.