GENERAL INFORMATION


OUTLINE OF CHANGE


Due to the addition of lane departure warning system (LDW), the service procedure has been established.

Lane departure warning system (LDW)


A lane departure warning system will warn the driver when the vehicle begins to move out of its lane. The LDW-ECU (integrating LDW camera), which is mounted behind the windshield, monitors the road ahead. If the system recognises that the driver is about to move out of its lane, the combination meter will provide a visual warning (on the multi-information display) and an audible warning (buzzer).
note If there are bad weather or poor road conditions, the system may not operate correctly.

Construction diagram





Main components and functions
Component name
 Functional Description
LDW-ECU (integrating LDW camera)
 Controls the LDW by using the following inputs/outputs and communications.

  • Stores a proper lane recognition and parameter information based on the variant coding which this ECU receives via CAN communication with the ETACS-ECU.
  • Receives a signal from the stop lamp switch, the side turn-signal lamp and the LDW switch via CAN communication with the ETACS-ECU.
  • Receives signals from the ECUs via CAN communication with the engine-ECU, the ASC-ECU and the steering wheel sensor.
  • Sends status information, a visual and audible LDW indicator/warning requests to the combination meter via CAN communication.
LDW switch
 Sends the LDW activation/deactivation status via harness wires.
Ignition switch
 Supplies power when the ignition switch is turned "ON" or "Start".
Stop lamp switch
 Sends the brake pedal depression/release status to the ETACS-ECU.
Column switch (Side turn-signal lamp switch (LH) or (RH))
 Sends a turn-signal lamp signal to the ETACS-ECU via LIN communication.
Combination meter
 Displays the audible and visual LDW indicator and warning according to the signals which are sent by the LDW-ECU.
Combination meter (multi-information display)
 LDW indicator
 Displays the LDW status. Also informs the driver that the LDW camera is initialised or the LDW camera image is tuned.
LDW warning
 Displays if the LDW fails.
Engine-ECU
 Sends vehicle speed signal to the LDW-ECU via CAN communication.
ASC-ECU
 Detects the yaw rate and longitudinal and lateral acceleration of the vehicle, and sends the corresponding signal to the LDW-ECU via CAN communication.
Steering wheel sensor
 Detects steering angle of the steering wheel, and sends the corresponding signal to the LDW-ECU via CAN communication.
ETACS-ECU
  • Relays a signal from the stop lamp switch to the LDW-ECU.
  • Sends a turn-signal lamp signal to the LDW-ECU.
  • Sends variant coding information to the LDW-ECU.
  • Sends the LDW switch on/off status, which is received via wiring harness wires, to the LDW-ECU via CAN communication. Furthermore, receives the audible and visual LDW indicator and warning requests from the LDW-ECU and then sends them via CAN communication.

System Configuration




System fail-safe


If a malfunction is detected, the system will enter a fail-safe mode to protect the system.
note For details of the fail-safe function, refer to Workshop Manual.

Operation


The LDW operates in the three stages below:
note The indicator and warning depend on these stages. If predetermined warning conditions are satisfied, the buzzer will sound.

  1. Operation status (LDW: ON)
  2. Warning monitor status (standby)
  3. Warning (WARNING L-LANE or WARNING R-LANE)


1. Operation status (LDW: ON)

If all of the conditions below are satisfied, the LDW switch will be active. When the switch is operated with it active, the operation status will be switched between "OFF" (LDW disabled) and "ON" (LDW enabled). (LDW operation status switching function)

  1. The ignition switch is turned from "OFF" to "ON" or "START"
  2. The LDW pre-check function is inactive (four seconds or more elapse since the ignition switch is turned "ON" for the first time).
  3. The LDW is not defective

2. Warning monitor status (standby)

If all of the conditions below are satisfied, the LDW will enter the warning monitor status (standby mode).

  1. The operation status is "ON."
  2. The LDW is not defective
  3. Vehicle speed is 65 km/h or more
  4. The stop lamp switch is "OFF" (the brake pedal is released)
  5. Seven seconds or more have elapsed since the side turn-signal lamp (LH or RH) was turned "OFF".
  6. The LDW camera has recognised a lane successfully or three seconds.
    note If a lane disappears suddenly, the system will extend the existing lane by 15 m as virtual lane. (If lane division lines are dotted-lines, the system also recognises them one continuous line.)
  7. Your vehicle is being driven on a road which radius exceeds 250 m.

3. Warning (WARNING L-LANE or WARNING R-LANE)




If your vehicle intrudes a warning range, the LDW will provide visual and audible warnings. The warning will be activated for 10 seconds in maximum. Even if the vehicle exits from the range soon, the warning will continue for at least three seconds.

Variable warning range

The warning range depends on your vehicle’s approaching speed to the lane line, or the distance between your vehicle and the lane line as shown.

Deactivating the warning
If your vehicle exits from the warning range or the predetermined warning time elapses, the system will deactivate the warning and return to the standby mode.

Disabling the warning
If a lane width is approximately 2.6 m or less or a lane is closed due to construction work, the system will disable the warning to prevent false operation.

Resuming the warning
The LDW stores the range where the repeated warning is inhibited. If a warning is activated once, that range will become active. When your vehicle exits from that range, the warning will be permitted again.