How to Troubleshoot the Lane Departure Warning (LDW)
LDW Indicator
When the LDW system detects a problem during operation, the LDW system stops operating, and the LDW indicator turns on.

NOTE: The LDW system communicates with the PCM, the VSA system, the gauge control module, and the steering angle sensor via the F-CAN. If a connected unit malfunctions, the LDW system will not operate. In this case, the LDW indicator and the connected unit indicator come on and stay on (except for the gauge control module).

Multi-Information Display (MID) Indication
The LDW system indicates its operation status on the MID in the gauge control module as below.
Self-Diagnostic Function
The LDW system has a self-diagnostic function. If the self-diagnostic function detects a malfunction, the LDW system stops operating, turns on the LDW indicator, and stores DTCs.
System Protect Function (High Temperature)
If the following icon appears on the MID, the LDW stops working. The multipurpose camera unit temperature is too hot. When the multipurpose camera unit temperature cools down to its proper operating temperature, the indicator on the MID turns off, and the LDW automatically resumes operation.

When the multipurpose camera unit temperature decrease, the indicator on the MID goes off and the LDW automatically returns to ON.

Dirt or Dust Detective Function
If the following icon appears on the MID, the camera lens or the windshield has enough dirt so that the camera view is obstructed. The LDW system 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 LDW system automatically turns back to ON.

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 LDW indicator comes on and blinks.
Multipurpose Camera Unit
The multipurpose camera unit uses input from the PCM, the VSA modulator-control unit, and the steering angle sensor to warn the driver when approaching the vehicle ahead. The multipurpose camera unit communicates with the gauge control module to send the warning signal.
CAN Communications
The multipurpose camera unit is on the F-CAN, and it communicates with other units (gauge control module, VSA modulator-control unit, steering angle sensor, and PCM) via the F-CAN.

If the multipurpose camera unit detects a communication error or a malfunction in another connected unit, the LDW system will not operate even though it is OK. In this case, both LDW indicator and 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 loose connections and terminals. Also check ground and power connections related to the circuit that you are troubleshooting.
How to Troubleshoot DTCs
Check the DTCs with the HDS.

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 LDW indicator does not come on while test-driving, but your troubleshooting was based on the 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 LDW indicator does not come on.
The LDW system sometimes stops operating because of the environment (weather, road conditions, driving conditions, etc.). A code may be stored in these cases:
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DTC B2A60-97: Dust or Dirt On The Camera
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DTC U3000-49: Multipurpose Camera Unit Internal Electronic Failure
How to Retrieve DTCs
NOTE: Make sure the 12 volt battery is fully charged before you begin.

1.

2.
Use the HDS to check for LDW system for DTCs.

3.
Read and record the DTC.

4.
Turn the vehicle to the OFF (LOCK) mode, then wait for 10 seconds.

5.
Disconnect the HDS from the DLC.

6.
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.

2.
In the DRIVING SUPPORT MENU of the HDS, select Integrated Driver Support System, then choose the clear DTCs icon, and follow the prompts.

3.
Turn the vehicle to the OFF (LOCK) mode, then wait for 10 seconds.

4.
Disconnect the HDS from the DLC.