LANE DEPARTURE WARNING (LDW) SYSTEM : System Description
WARNING: This page is about a different car, the 2011 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
SYSTEM DIAGRAM
ADAS CONTROL UNIT INPUT/OUTPUT SIGNAL ITEM
Input Signal Item
ADAS CONTROL UNIT INPUT/OUTPUT SIGNAL ITEM
| Transmit unit | Signal name | Description | |
|---|---|---|---|
| ABS actuator and electric unit (control unit) | CAN communication | Vehicle speed signal (ABS) | Receives wheel speeds of four wheels |
| BCM | CAN communication | Turn indicator signal | Receives an operational state of the turn signal lamp and the hazard lamp |
| Lane camera unit | ITS communication | Detected lane condition signal | Receives detection results of lane marker |
| Warning systems switch | Warning systems switch signal | Receives an ON/OFF state of the warning systems switch | |
Output Signal Item
OUTPUT SIGNAL ITEM
| Reception unit | Signal name | Description | |
|---|---|---|---|
| Combination meter | CAN communication | Lane departure warning lamp signal | Transmits a lane departure warning lamp signal to turn ON the lane departure warning lamp |
| Lane camera unit | ITS communication | Vehicle speed signal | Transmits a vehicle speed calculated by the ADAS control unit |
| Turn indicator signal | Transmits a turn indicator signal received from BCM | ||
| Warning buzzer | Warning buzzer signal | Activates the warning buzzer | |
| Warning systems ON indicator | Warning systems ON indicator signal | Turns ON the warning systems ON indicator | |
FUNCTION DESCRIPTION
- Lane Departure Warning (LDW) system provides a lane departure warning function when the vehicle is driven at speeds of approximately 70 km/h (45 MPH) or more.
- When the vehicle approaches either the left or the right side of the traveling lane, a warning will sound and the lane departure warning lamp (yellow) on the combination meter will blink to alert the driver.
- The warning does not occur during turn signal operation (Lane change side).
- The warning function will stop when the vehicle returns inside of the lane markers.
EXAMPLE
When the vehicle approaches the right lane marker, the driver is alerted by the buzzer and the blinking of lane departure warning lamp (yellow).
OPERATION DESCRIPTION
- When the system is turned ON by operating the warning systems switch, ADAS control unit turns ON the warning systems ON indicator.
- Lane camera unit monitors lane markers of the traveling lane. It transmits the detected lane condition signal to ADAS control unit via ITS communication.
- When judging from a lane marker detection signal that the vehicle is approaching the lane marker, the ADAS control unit controls the following item to alert the driver.
- Activates warning buzzer
- ADAS control unit transmits a lane departure warning lamp signal to combination meter via CAN communication and turns ON/OFF the lane departure warning lamp (yellow).
OPERATING CONDITION
- Warning systems ON indicator: ON
- Vehicle speed: approximately 70 km/h (45 MPH) or more
- Turn indicator signal: After 2 seconds or more from turned OFF
NOTE:
- After the operating conditions of warning are satisfied, the warning continues until the vehicle speed reaches approximately 60 km/h (40 MPH)
- LDP ON indicator lamp is OFF
- The LDW system may not function properly, depending on the situation. Refer to "PRECAUTIONS FOR LANE DEPARTURE WARNING/LANE DEPARTURE PREVENTION "
Bulb Check Action and Fail-safe Indication
VEHICLE CONDITION/ DRIVER'S OPERATION
| Vehicle condition/Driver's operation | Warning systems ON indicator | Indication on the combination meter | ||
|---|---|---|---|---|
| Ignition switch OFF ==> ON (Bulb check) | Approx. 5 sec. ON(1) | |||
| When DTC is detected (Except "C1B01" and "C1B03") | ON | |||
| Camera aiming is not completed ("C1B01" is detected)
NOTE:
This is detected while driving the vehicle and the indication remains ON until the ignition switch is turned OFF
|
ON | |||
| Temporary disabled status at high temperature ("C1B03" is detected) | ON | |||
|
||||
LDW INITIAL STATE CHANGE
CAUTION:
Never change LDW initial state "ON" ==> "OFF" without the consent of the customer.
LDW initial state can be changed.
- LDW initial ON* - LDW function is automatically turned ON, when the ignition switch OFF ==> ON.
- LDW initial OFF - LDW function is still OFF when the ignition switch OFF ==> ON.
*: Factory setting
How to change FCW/LDW/BSW initial state
- Turn ignition switch ON.
- Warning systems switch is OFF.
- Push and hold warning systems switch for more than 4 seconds.
- Buzzer sounds and blinking of the warning systems ON indicator informs that the FCW/LDW/BSW initial state change is completed.