LANE DEPARTURE WARNING SYSTEM (LDWS) [(E)]
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Outline
• The lane departure warning system (LDWS) recognizes vehicle lane lines on a road using the forward sensing camera (FSC) installed to the windshield, and if the vehicle departs from its lane unbeknownst to the driver, the system alerts the driver of the lane departure using a warning indication and warning sound.
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Warning
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• The lane departure warning system (LDWS) is only a supplementary system for the prevention of a lane departure, however the lane departure warning system (LDWS) functions have limitations. Relying solely on the lane departure warning system (LDWS) and neglecting prudent steering wheel operation could cause an unexpected accident resulting in death or serious injury. Do not rely solely on the lane departure warning system (LDWS). Always make lane corrections using the steering wheel and drive safely.
• The lane departure warning system (LDWS) may not operate normally under the following conditions.
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― Poor vehicle lane line visibility due to adverse weather (rain, snow, fog)
― Poor vehicle lane line visibility due to snow on the road, water puddles, or road ruts, or backlight.
― Poor vehicle lane line visibility due to cracks and fissures in the vehicle lane
― Vehicle lane lines intersect with complexity due to additions or reductions of travel lanes
― Vehicle lane marking is not completely erased after road maintenance, or two or more lane lines next to each other
― Vehicle lane lines not recognized due to vehicle ahead
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Caution
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• If the forward sensing camera (FSC) aiming is not completed correctly, the forward sensing camera (FSC) cannot store the camera shooting angle and the lane departure warning system (LDWS) may not operate normally. When performing the following servicing, always perform the forward sensing camera (FSC) aiming. In addition, for the FSC aiming procedure, refer to the [FORWARD SENSING CAMERA (FSC) AIMING] in the Workshop Manual.
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― Forward sensing camera (FSC) replacement
― Forward sensing camera (FSC) clip replacement
― Windshield replacement
Structural view
Function
• The body control module (BCM) sets warning-trigger lines based on the vehicle lane lines recognized by the forward sensing camera (FSC), and if the vehicle contacts one of these warning-trigger lines it activates the warning indicator and warning sound. For details on the forward sensing camera (FSC) and warning-trigger lines, refer to [FORWARD SENSING CAMERA (FSC)]. (See
FORWARD SENSING CAMERA (FSC) [(E)].)
Driver operation determination function
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• The body control module (BCM) determines the following driving operations as the driver's intentions and controls the warning operation.
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― After turn switch is operated, vehicle lane is changed
― After smart turn is operated, vehicle lane is changed within 5 s
System conditions display function
• The body control module (BCM) displays the system conditions on the active driving display and the multi-information display.
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LDWS condition
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Condition
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i-ACTIVSENSE status symbol (warning/risk avoidance support system)
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i-ACTIVSENSE OFF symbol (warning/risk avoidance support system)
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i-ACTIVSENSE warning light
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Multi-information display
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Active driving display
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OFF
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System is off
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OFF
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OFF
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No display
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No display
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ON
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Vehicle lane lines are recognized at a vehicle speed of approx. 64 km/h {40 mph} or more
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OFF
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OFF
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No display
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While warning is triggered
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OFF
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OFF
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No display
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Vehicle speed is approx. 56 km/h {35 mph} or less
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OFF
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OFF
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No display
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No display
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Vehicle lane lines are not recognized
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OFF
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Forward sensing camera (FSC) detects that the camera/windshield is dirty or fogging
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OFF
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OFF
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No display
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System malfunction
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OFF
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ON
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No display
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System wiring diagram
Block diagram
Operation
Operation conditions
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• The lane departure warning system (LDWS) operates when all the following conditions are met.
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― LDWS system is on
― Vehicle speed signal of approx. 60 km/h {37 mph} or more is received from DSC
― Vehicle contacts warning-trigger line without intention of driver
Operation
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• The period of time in which the warning is triggered differs by the period of time in which the vehicle is contacting the warning-trigger line.
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― Vehicle contacts warning-trigger line for less than 1 s: Warning triggers for 1 s
• The warning method can be selected from the following 3 options.
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― Steering wheel vibration only
― Warning sound only
― Steering wheel vibration and warning sound
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1. The forward sensing camera (FSC) sends lane line information (1) to the body control module (BCM).
2. When the body control module (BCM) receives the lane line information (1) from the forward sensing camera (FSC), it determines (2) whether or not to activate the warning sound or display the warning indication.
3. If the body control module (BCM) determines that a warning sound and a warning indication are required, it sends (3) a warning indication request signal and a notification and warning speaker (front) signal to the instrument cluster.
4. When the instrument cluster receives the warning indication request signal from the body control module (BCM), it displays the warning screen (4) on the multi-information display.
