Hyundai Elantra: LKAS(Lane Keeping Assist System) / Description and Operation

Hyundai Elantra AD (2016-2020) Service Manual / Body Electrical System / LKAS(Lane Keeping Assist System) / Description and Operation

Description

LKAS (Lane Keeping Assist System) : The system is designed to help recognize the lane ahead and to give off a lane departure warning when the vehicle starts moving out of the lane by using the camera image and vehicle signal information.

LKAS Controller Typical Operating Conditions

Note that operating conditions are tuned to meet the customer requirements

-	Vehicle speed within 60kph – 200kph

-	A lane is clearly visible.

-	Driver is not overriding the system – applying a large steering torque

-	Directional (including hazard) signals are off

-	The lane width is within 2.7m to 4.2m

-	The curvature of lane is greater than 250m

-	The vehicle’s absolute lateral acceleration is < 2.5m/s2

-	The driver’s hands are on the steering wheel

-	The vehicle is not out of the lane by greater 0.3m

-	The absolute steering angle is < a given value (e.g 90 degrees)

-	The maximum allowable time for maximum torque application has not been exceeded. (90 seconds)

-	Reverse or EPS city mode is not engaged

-	No fault is present in the system

Block Diagram

System Operation

1.	Lane Keeping Assist System (LKAS) : The system is designed to help recognize the lane ahead and to give off a lane departure warning when the vehicle starts moving out of the lane by using the camera image and vehicle signal information.

2.	High Beam Assist (HBA) : Detects head lamp and tail lamp lights of vehicle ahead and turns the high beam ON/OFF.

Lane Keeping Assist System Display (Instrument Panel)

Press the LKAS switch to turn on the LKAS lamp on the instrument panel and display the status of the lane departure warning system at the center of the instrument panel.

The different statuses of LDWS is shown in the following table.

Lane not detected	Lane detected and LKAS system engaged	LKAS Cancelled

Right side deviation	Left side deviation	LKAS Cancelled

High Beam Assist (Multi-Function Switch Auto/High Beam Position)

Description	Display status in Cluster	Remarks
Turned on in the cluster when HBA is on.		Vehicle speed of 45 km/h or above

LKAS ON/OFF Switch

1.	When the LKAS switch is pressed, the LKAS is on while the LDWS lamp is on. When the switch is pressed again, the LKAS is off and the display lamp is off.

High Beam Auto Control Switch : High Beam Auto Control System is turned ON if the Multifunction Switch Light SW is set to AUTO, and the Light SW is set to High Beam position (Pushed).

A.	If the Light SW is not set to AUTO, or to High Beam position, the High Beam Auto Control System is turned OFF.

Warning

1.	Visual warning : The warning is displayed on the cluster.

2.	Audio warning : The warning sound is issued from the speakers connected to the cluster or from the speakers connected to the external amplifier if there is an external amplifier.

LKAS is capable of recognizing continuing lines as lanes and has limited lane recognition capabilities when it comes to sharp-bending roads.

In addition, the system may not function properly under the following circumstances :

-	No or faded lane markings (failed lane detection).

-	Low visibility due to foul weather conditions.

-	Low light or sudden change in exterior light conditions.

-	Sharp bends of the road (curvature radius of less than 250m).

-	Sidewalks and other dividing structures along the edge of the lane.

-	Dirty windshield (low camera visibility).

Components and Components Location

Components 1. LKAS ON/OFF Switch2. Instrument Cluster3. LKAS Unit ...

Repair procedures

Service Point Target Auto Calibration (SPTAC) This procedure provides a way to calibrate the camera by having the service technician align the car to a well lit simulated straight road target; ...

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