Components and Components Location

Components

1. LKAS ON/OFF Switch 2. Instrument Cluster

3. LKAS Unit

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)

1.

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

2.	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.

2.	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).

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; preferably wall mounted.

The LKAS camera will have a "System Out of Calibration" DTC set if not operating within specified tolerances.

The LKAS will be supplied for field service replacement with the "System Calibration Required / Variant Coding Error" DTC set if it is a replacement part delivered directly from supplier manufacturing.

1.

Guidelines for Selecting a Suitable Target In order for LKAS Service Calibration-Static routine to complete successfully, the following conditions are required: A. Target (SST : 09890-3V100) surface is perpendicular to the camera in both horizontal and vertical orientations to maintain maximum of 1° roll. B. Target is mounted to rigid backer material to maintain flatness requirements. C. Target has reflective (not faded or poorly painted) markings that are unlike from lane features. D. Target is 30 cm wide and 100 cm tall. E. Mounting area must NOT have cross hatch patterns or textual markings near the target. F. Target should be well lit for optimal performance using non-fluctuating illumination. There shall be no continuous shadows cast on the target.

2.

Service Point Target Auto Calibration Procedure (1) It is recommended to check vehicle toe-in and tire pressure levels to ensure proper alignment of the camera to the "world" before proceeding with calibration. The vehicle to run the calibration routine is to be at nominal production loading capacity. (2) Windshield must be clean and silk-screen checked so that there is no blockage of the camera. (3) Service technician connects the diagnostic connector and starts the vehicle. The camera module should not be activated by pressing the switch. (4) The service calibration routine may not run correctly if any system level fault is active. (5) If working with a replacement ECU: the service technician initiates the SPTAC Reset configuration. (6) Service technician either aligns the vehicle to the target or the target to the vehicle. A. Bottom of the target is 90 ± 1 cm (35.4 ± 0.4 in.) from the ground and aligned with the camera lens horizontal axis. • The target (A) is placed along the vehicle’s longitudinal axis (centerline) within ±3 cm (±1.2 in.) of target center. (Horizontal deviation (B) : ±3 cm (±1.2 in.)) B. The positon of target (A) in short distance is 0 ± 5 cm (0 ± 2 in.) (B) in front of front bumper. C. The positon of target (A) in long distance is 100 ± 5 cm (39.4 ± 2 in.) (B) in front of front bumper. • The tolerance angle of target in horizontal direction is ± 10°. • The tolerance angle of target in vertical direction is ± 5°. (7) Technician ensures target placement location and checks the "OK" message on the diagnostic tool (KDS/GDS). (8) Clear all DTCs. (9) Turn "OFF" ignition and "ON" again.

Test Drive

The LKAS may not activate properly in the following conditions. - In case lane is not visible due to glare or heavy rain. - In case the road is covered with snow. - In case puddle on the road surface reflects street light or head light from oncoming vehicle. - In case there is blocking object such as sidewalk on the side of the road. - In case there is trace of more than one lane due to road repair. - In case the distance with vehicle in front is very short. - Be sure to perform test drive to check for normal operation after performing optical angle test. - Drive on straight road (of longer than 500 m) with 2 white or yellow lane marks at speed of over 64 km/h (40 mph), and check for the alert as you intentionally steer close to the lane mark. - LKAS operates properly if the lane mark segment space is less than 8 m. - LKAS activates at vehicle speed above 64 km/h (40 mph). - Perform test drive on car-only road or on a highway.

LKAS Unit Components and Components Location

Components

LKAS Unit Repair procedures

Removal

1.	Disconnect the negative (-) battery terminal.

2.	Remove the LDWS unit cover (A).

3.	Disconnect the LKAS unit connector (A).

4.	Remove the LKAS unit after disengaging the mounting bracket (A).

Installation

1.	Align LDWS unit with windshield bracket using forward edge point (A).

2.	Engage snaps and pivot upward to lock point (B). • LKAS unit is fully assembled when a single click sound is hear.

3.	Connect the LKAS unit connector.

4.	Connect the negative (-) battery terminal.