Mazda CX-9 Owners Manual: Lane-keep Assist System (LAS) & Lane Departure Warning System (LDWS)

The LAS & LDWS alerts the driver that the vehicle may be deviating from its lane and it provides steering assistance to help the driver stay within the vehicle lanes.

The Forward Sensing Camera (FSC) detects the white lines (yellow lines) of the vehicle lane in which the vehicle is traveling and if the system determines that the vehicle may deviate from its lane, it operates the electric power steering to assist the driver's steering operation. The system also alerts the driver by activating a lane departure warning sound, vibrating the steering wheel, and indicating an alert in the display. Use the system when you drive the vehicle on roads with white (yellow) lines such as expressways and highways.

Refer to Forward Sensing Camera (FSC).

WARNING

Do not rely completely on the LAS & LDWS:

• The LAS & LDWS is not an automatic driving system. In addition, the system is not designed to compensate for a driver's lack of caution, and over-reliance on the system could lead to an accident.
• The detection ability of the LAS & LDWS is limited. Always stay on course using the steering wheel and drive with care.

Do not use the LAS & LDWS in the following cases: The system may not operate adequately according to the actual driving conditions, resulting in an accident.

• Driving on roads with tight curves.
• Driving under bad weather conditions (rain, fog, and snow).
• Slippery roads such as ice or snow-bound roads.
• Roads with heavy traffic and insufficient distance between vehicles.
• Roads with no white (yellow) lane lines.
• Narrow roads resulting from road construction or lane closures.
• The vehicle is driven on a temporary lane or section with a closed lane resulting from road construction where there may be multiple white (yellow) lane lines or they are interrupted.
• Vehicle is driven on roads other than expressways and highways.
• The tire pressures are not adjusted to the specified pressure.
• Tires of a different specified size are used, such as an emergency spare tire.

CAUTION

Heed the following cautions so that the LAS & LDWS can operate normally.

• Do not modify the suspensions.
• Always use wheels of the specified type and size for the front and rear wheels. Consult an Authorized Mazda Dealer for tire replacement.

NOTE

• When the turn signal lever is operated for a lane change, the LAS & LDWS is automatically disabled. The LAS & LDWS becomes operational again when the turn signal lever is returned and the system detects white (yellow) lane lines while the vehicle is being driven normally within its vehicle lane.
• If the steering wheel, accelerator pedal, or brake pedal is operated abruptly and the vehicle moves close to a white (yellow) line, the system determines that the driver is making a lane change and the LAS & LDWS operation is temporarily canceled. The LAS & LDWS becomes operational again when the system detects white (yellow) lane lines while the vehicle is being driven normally within its vehicle lane.
• If the vehicle deviates from its lane repeatedly within a short period of time, the LAS & LDWS may not operate.
• When white (yellow) lane lines are not detected, the LAS & LDWS does not operate.
• Under the following conditions, the LAS & LDWS may not be able to detect white (yellow) lane lines correctly and it may not operate normally.
  • If an object placed on the dashboard is reflected in the windshield and picked up by the camera.
  • Heavy luggage is loaded in the luggage compartment or on the rear seat and the vehicle is tilted.
  • The tire pressures are not adjusted to the specified pressure.
  • Tires other than conventional tires are equipped.
  • Vehicle is driven on an intersection or junction, or on a forked road.
  • The white (yellow) lane lines are less visible because of dirt or fading/patchiness.
  • A vehicle in front of your vehicle is running near a white (yellow) lane line making it less visible.
  • A white (yellow) lane line is less visible because of bad weather (rain, fog, or snow).
  • The vehicle is driven on a temporary lane or section with a closed lane resulting from construction where there may be multiple white (yellow) lane lines or they are interrupted.
  • A misleading line is picked up on the road such as a temporary line for construction, or because of shade, lingering snow, or grooves filled with water.
  • The surrounding brightness suddenly changes such as when entering or exiting a tunnel.
  • The illumination of the headlights is weakened because of dirt or the optical axis is deviated.
  • The windshield is dirty or foggy.
  • The windshield, camera is fogged (water droplets).
  • Back-light is reflected off the road surface.
  • The road surface is wet and shiny after rain, or there are puddles on the road.
  • The shade of a guardrail parallel to a white (yellow) lane line is cast on the road.
  • The width of the driving lane is narrow or wide.
  • Driving on roads with tight curves.
  • The road is excessively uneven.
  • The vehicle is shaken after hitting a road bump.
  • There are 2 or more adjacent white (yellow) lane lines.
  • There are various road markings or lane markings of various shapes near an intersection.

System Operation

Make sure that the LAS & LDWS OFF switch indicator light is turned off. When the LAS & LDWS OFF switch indicator light is turned on, press the switch and make sure that the switch indicator light turns off.

The LAS & LDWS indication (gray) is displayed in the multi-information display, and the system goes on stand-by.

Drive the vehicle in the center of the vehicle lane while the system is on standby. When all of the following conditions are met, the LAS & LDWS indication (white) is displayed in the multi-information display, and the system becomes operational.

• The engine is running.
• The vehicle speed is about 60 km/h (37 mph) or faster.
• The system detects white (yellow) lane lines on both the right and left sides.
• The driver is operating the steering wheel.
• The driving lane is neither narrow nor wide.

NOTE The LAS & LDWS indication is gray when the system detects only a white (yellow) line on either the left or right, and the indication changes to white when the system detects white (yellow) lines on both the left and right sides.

The LAS & LDWS goes on stand-by status in the following cases:

• The system cannot detect white (yellow) lane lines.
• The vehicle speed is less than about 60 km/h (37 mph).
• The ABS/TCS is operating.
• The TCS is turned off.

  (If the TCS is turned off while the system is operational, a warning beep is heard and the system goes on standby.)

• The vehicle is making a sharp curve.
• The brake pedal is depressed.
• The steering wheel is operated abruptly.
• The width of a lane is excessively narrow or wide.

NOTE

• The LAS & LDWS does not operate until the system detects white (yellow) lane lines on either the left or right.
• When the system detects a white (yellow) lane line on one side only, the system will not operate the steering wheel operation assist and the warning for the lane line on the side that is not being detected. The steering wheel operation assist and the warning is only for a lane deviation on the side that is being detected.
• If the driver takes his or her hands off the steering wheel (not holding the steering wheel), the warning sound is activated and an alert is indicated in the multi-information display or the active driving display.

If the steering wheel is held lightly, or depending on the road conditions, the system may detect that you have released the steering wheel (not holding the steering wheel) even if you are holding it, and display a message in the multi-information display or the active driving display.

• The timing at which the lane departure warning is activated and the steering wheel operation assist is performed varies.
• The following settings for the LAS & LDWS can be changed.
  • Steering operation assist operational/ non-operational
  • Cancel sensitivity (likelihood of steering assist)

Vehicle lane line display

When the LAS & LDWS becomes operational while on standby, the vehicle lane lines are displayed in the multi-information display and the active driving display. In the vehicle lane lines display indicating the operation status, the color of the vehicle lane lines being detected changes to white.

(Stand-by status)

(Operational status)

Auto cancel

In the following cases, the LAS & LDWS is automatically canceled, the LAS & LDWS warning indication (amber) turns on, and an alert is displayed. When the LAS & LDWS become operational, the system turns back on automatically.

• The temperature inside the camera is high or low.
• The windshield around the camera is foggy.
• The windshield around the camera is blocked by an obstruction, causing poor forward visibility.

Auto cancel of warning/steering assist

When the following operations are performed, the LAS & LDWS operation is canceled automatically. The LAS & LDWS resumes automatically after the operation.

• The steering wheel is operated abruptly.
• The brake pedal is operated.
• The accelerator pedal is operated.

  (To cancel the automatic sensitivity cancel function, deselect "Cancel sensitivity" in the personalization features setting.)

• The turn signal lever is operated.
• The vehicle crosses a lane line.

NOTE

• After the operation, the LAS & LDWS operation may not operate for a period of 5 seconds at the most until the lane lines are detected.
• Under the following conditions, the LAS & LDWS cancels the warning/steering assist automatically.
• The driver takes his/her hands off the steering wheel.

  (The LAS & LDWS is designed to assist the driver's steering operation and it will resume operation automatically when the driver holds the steering wheel.)

• The TCS OFF switch is pressed to cancel the TCS.

Steering operation assist OFF (non-operational)

The steering operation assist for the LAS & LDWS can be changed to non-operational (OFF).

When the steering operation assist has been changed to inoperable (OFF), only the lane departure warning is operational.

System operation

Make sure that the LAS & LDWS OFF switch indicator light is turned off. When the LAS & LDWS OFF switch indicator light turns on, press the switch and make sure that the switch indicator light turns off.

Drive the vehicle in the center of the driving lane while the LAS & LDWS OFF switch indicator light is turned off.

The system becomes operational when all of the following conditions are met.

• The system detects white (yellow) lane lines on both the right and left sides or on either side.
• The vehicle speed is about 60 km/h (37 mph) or faster.
• The vehicle is driven on a straight road or road with gentle curves.
• The engine is running.

The LAS & LDWS goes on stand-by status in the following cases:

• The system cannot detect white (yellow) lane lines.
• The vehicle speed is less than about 60 km/h (37 mph).
• The vehicle is making a sharp curve.
• The vehicle is making a curve at an inappropriate speed.

NOTE

• The LAS & LDWS remains on stand-by until it detects white (yellow) lines on both the left and right sides, or on either side.
• When the system detects a white (yellow) lane line on one side only, the system will not activate warnings for the lane line on the side that is not being detected.
• The distance and warning sensitivity (likelihood of a warning) which the system uses to determine the possibility of a lane departure can be changed.

Vehicle lane line display

When the LAS & LDWS becomes operational while on standby, the vehicle lane lines are displayed in the multi-information display. The system changes to operational status display when the system detects a white (yellow) line on either the left or right.

(Stand-by status)

(Operational status)

Auto cancel

In the following cases, the LAS & LDWS is automatically canceled, the LAS & LDWS warning indication (amber) turns on, and an alert is displayed. When the LAS & LDWS become operational, the system turns back on automatically.

• The temperature inside the camera is high or low.
• The windshield around the camera is foggy.
• The windshield around the camera is blocked by an obstruction, causing poor forward visibility.

(Auto cancel of warnings)

When the following operations are performed, the LAS & LDWS determines that the driver intends to make a lane change and the system operation is canceled automatically. The LAS & LDWS resumes automatically after the operation.

• The steering wheel is operated abruptly.
• The brake pedal is depressed.
• The accelerator pedal is depressed.

  (To cancel the automatic sensitivity cancel function, deselect "Warning sensitivity" in the personalization features setting.)

• The turn signal lever is operated.
• The vehicle crosses a lane line.

System Canceling

When the LAS & LDWS is turned off, press the LAS & LDWS OFF switch.

The LAS & LDWS OFF switch indicator light turns on.

NOTE

• In the following cases, the LAS & LDWS is canceled automatically and the LAS & LDWS OFF indication is displayed in the multi-information display. Have your vehicle inspected at an Authorized Mazda Dealer.
  • There is a malfunction in the power steering.
  • There is a malfunction in the TCS.
  • There is a malfunction in the Forward Sensing Camera (FSC).
• When the ignition is switched OFF, the system status before it was turned off is maintained. For example, if the ignition is switched OFF with the lane-keep system operable, the system will be operable when the ignition is switched ON the next time.

When the LAS & LDWS is turned off, the vehicle lane line indication in the multi-information display and the active driving display turn off.

Lane Departure Warning

If the system determines that the vehicle may deviate from its lane, the lane departure warning (beep sound, rumble sound*1, or steering wheel vibration) is activated and the direction in which the system determines that the vehicle may deviate is indicated in the multi-information display and the active driving display.

If the system determines that the vehicle may deviate from its lane, the color of the lane line on the side being detected by the system changes from white to amber, and flashes.

Multi-information Display

Active Driving Display

NOTE

• If you have set the lane departure warning sound to the beep sound/rumble sound*1 setting, the warning sound may not be heard depending on the surrounding noise conditions.
• If you have set the lane departure warning system to the steering wheel vibrations setting, the vibration may not be felt depending on the road surface conditions.
• When the setting for the steering operation assist is changed to operational, the warnings can be set to activate/not activate. (When the setting for the steering operation assist is changed to non-operational, the warnings cannot be set to not activate.)
• The LAS & LDWS can be changed to the following settings regardless of whether the steering operation assist has been set to operational/non-operational. Always check the setting status when driving the vehicle and make setting changes if necessary.
  • Steering wheel vibration: Strong/weak
  • Warning sound volume
  • Types of warnings (steering wheel vibration/beep sound/rumble sound*1)

*1 A rumble strip is a series of grooves in the road pavement surface positioned at specific intervals, and when the vehicle passes over it a vibration and rumble sound is produced which alerts the driver that the vehicle is departing from the lane.

The rumble sound is a reproduction of the sound which occurs when a vehicle passes over a rumble strip.