How to Troubleshoot the Lane Keeping Assist System (LKAS)

LKAS Indicator (Amber)

When the LKAS detects a problem while working, the LKAS stops working, then the LKAS indicator and/or the EPS indicator (amber) stay on.

NOTE:

	The EPS control unit supports the LKAS control. When there is an EPS control unit malfunction when the LKAS is working, both the EPS and the LKAS indicators come on.
	The LKAS communicates with the PCM, the EPS control unit, the VSA system, the steering angle sensor, and the gauge control module via the F-CAN. If a connected unit malfunctions, the LKAS will not operate. In this case, both the LKAS indicator and the connected unit indicator come on and stay on (except for the gauge control module).

Multi-Information Display (MID) Indication

When the LKAS is OK, the LKAS indicates its operation on the MID when the MAIN switch is ON.

When the LKAS is OK, the LKAS activation indicator (LANE OUTLINE) comes on when the LKAS switch is ON, and goes off when the LKAS switch is OFF. While assisting steering, the LKAS activation indicator turns from LANE OUTLINE to SOLID LANE.

Self-Diagnostic Function

The LKAS has a self-diagnostic function. If the self-diagnostic function detects a malfunction, the LKAS stops working, turns on the LKAS indicator (amber), and stores DTCs.

Dirt or dust detective function (CLEAN FRONT WINDSHIELD Indication)

If the message CLEAN FRONT WINDSHIELD appears on the MID, the camera lens or the windshield has enough dirt so that the camera view is obstructed. The LKAS system stops working.

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 system automatically turns back to ON.

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

If the message MULTIPURPOSE CAMERA HOT appears on the MID, the LKAS system stops working. The multipurpose camera unit temperature is too hot.

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.

Multipurpose Camera Unit

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

EPS Control Unit

The EPS control unit receives a signal of steering wheel control from the multipurpose camera unit. The LKAS does not work when there is an EPS control unit malfunction.

If both EPS and LKAS indicators come on, check for EPS system DTCs first.

CAN Communication

The multipurpose camera unit is on the F-CAN, and it communicates with other units (gauge control module, steering angle sensor, PCM, EPS control unit, and VSA modulator-control unit) via the F-CAN.

How to Troubleshoot DTCs

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

Before troubleshooting, check and note these items:

	Ask the client 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 code may be stored in these cases.

DTCs may be stored even when the system is OK:

DTC B2A60-52: Dynamic Camera Aiming Incomplete

DTC B2A60-54: Static Camera Aiming Incomplete

DTC C0051-62: Steering Angle Sensor Straight Point Error

DTC C0051-96: Steering Angle Sensor Malfunction

DTC C1040-00: Wheel Speed Signal Error

DTC U0100-00: Lost Communication With The PCM (PGM-FI System)

DTC U0101-00: Lost Communication With The PCM/TCM

DTC U0122-00: Lost Communication With The VSA Modulator-Control Unit

DTC U0155-00: Lost Communication With The Gauge Control Module

DTC U0420-68: EPS Control Unit Malfunction

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 loose connections and terminals. Also check ground and power connections related to the circuit that you are troubleshooting.

How to Retrieve DTCs

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

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

2.	Connect the HDS (Honda Diagnostic System) to the data link connector (DLC) (A) located under the driver’s side of the dashboard.

3.	Turn the vehicle to the ON mode.

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

5.	Use the HDS to check for LKAS for DTCs.

Read and record the DTC:

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

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

8.	Disconnect the HDS from the DLC.

9.	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 OFF (LOCK) mode.

2.	Connect the HDS (Honda Diagnostic System) to the data link connector (DLC) (A) located under the driver’s side of the dashboard.

3.	Turn the vehicle to the ON mode.

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

5.	In the DRIVING SUPPORT MENU of the HDS, select Integrated Driver Support System, then choose the clear DTCs icon, and follow the prompts.

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

7.	Disconnect the HDS from the DLC.