How to Troubleshoot the Lane Keeping Assist System (LKAS)

LKAS Indicator (Amber)

When the LKAS detects a problem while operating, the LKAS stops operating, and the LKAS indicator stays on.

NOTE:

	For LKAS function, review the Lane Keeping Assist System (LKAS) Description.
	The LKAS communicates with other control units via the F-CAN. For LKAS diagram, refer to the System Diagram for LKAS. If a connected unit malfunctions, the LKAS will not operate. In this case, both LKAS indicator and connected unit indicator come on and stay on.

Multi-Information Display (MID) Indication

When the LKAS indicates OK, the LKAS indicates its status on the multi-information display (MID) when the MAIN switch is ON.

Self-Diagnostic Function

The LKAS has a self-diagnostic function. If the self-diagnostic function detects a malfunction, the LKAS stops operating. The LKAS indicator come on, and the system indicates "Lane Keeping Assist Problem" on the MID, and stores the DTC.

Multipurpose Camera Unit

Multipurpose camera unit function sends the lane image which was received by the multipurpose camera to the multipurpose camera unit. Also, it is equipped with an error detection feature which sends error data to the multipurpose camera unit when a malfunction is detected.
The multipurpose camera unit communicates with the gauge control module to send a warning signal.

Multipurpose Camera Aiming Function

If the multipurpose camera unit or the windshield is removed or replaced, you must do the multipurpose camera aiming procedure. If the aiming is incomplete, the LKAS indicator blinks.

Dirt or Dust Detective Function (CLEAN WINDSHIELD Indication)

If the message appears on the MID, the camera lens or the windshield has enough dirt so that the camera view is obstructed. The LKAS stops operating.

Clean any dirt or contamination on the camera lens or the windshield. Once the camera's view is unobstructed, the MID turns off and the LKAS automatically turns back to ON.

System Protect Function (High Temperature) (MULTIPURPOSE CAMERA HOT Indication)

If the message appears on the MID, the LKAS stops operating.

When the multipurpose camera temperature cools down to its proper operating temperature, the indicator on the MID turns off, and the LKAS automatically resumes operation.

CAN Communication

The multipurpose camera unit is on the F-CAN, and it communicates with other units via the F-CAN.

If the multipurpose camera unit detects a communication error or a malfunction in another connected unit, the LKAS will not operate even though it is OK. In this case, both the LKAS indicator and the related unit indicator will come on and stay on.

Intermittent Failures

The term ''intermittent failure'' means a system may have had a failure, but it checks OK now. If you cannot reproduce the condition, check for intermittent failure DTCs and freeze data. If intermittent failure DTCs are not stored, check for loose connections and terminals. Also check ground and power connections related to the circuit that you are troubleshooting.

How to Troubleshoot DTCs

Check for DTCs with the HDS. Make a copy of the freeze data, then clear the DTC.

NOTE: When the DTC is cleared with the HDS, the freeze data is cleared at the same time.

Before troubleshooting, check and note these items:

	Ask the customer about the conditions when the problem occurred, and try to reproduce the same conditions for troubleshooting.
	If the symptom does not appear and the LKAS indicator does not come on while test-driving and if your troubleshooting was based on a DTC, check for poor connections or loose terminals at all connectors related to the circuit that you are troubleshooting.
	After the troubleshooting or repairs are done, clear the DTCs, and test-drive the vehicle under the same conditions as when the DTC was originally set. Make sure the LKAS indicator does not come on.
	The LKAS sometimes stops operating because of the environment (weather, road conditions, driving conditions, etc.). A DTC may be stored in these cases.

How to Retrieve DTCs

NOTE: Make sure the 12 volt battery is fully charged before you begin.

1.	Turn the vehicle to the ON mode.

2.	Connect the HDS to the DLC (A) located under the driver's side of the dashboard.

3.	Make sure the HDS communicates with the vehicle and the multipurpose camera unit. If it does not, go to the DLC circuit troubleshooting.

4.	Use the HDS to check for Integrated Driver Support system DTCs.

Read and record the DTC.

	Freeze data indicates the LKAS conditions when the first system malfunction that activated the indicator was detected.
	The HDS can read the DTC, the freeze data, the current data, and other system data.

6.	Turn the vehicle to the OFF (LOCK) mode.

7.	Disconnect the HDS.

8.	Do the troubleshooting procedure for the DTC.

How to Clear DTCs

NOTE: Make sure the 12 volt battery is fully charged before you begin.

1.	Turn the vehicle to the ON mode.

2.	Connect the HDS to the DLC (A) located under the driver's side of the dashboard.

3.	Make sure the HDS communicates with the vehicle and the multipurpose camera unit. If it does not, go to the DLC circuit troubleshooting.

4.	Clear the DTC(s) by following the screen prompts on the HDS.

5.	Turn the vehicle to the OFF (LOCK) mode.

6.	Disconnect the HDS.