How to Troubleshoot the Road Departure Mitigation

RDM Indicator (Amber)

When the RDM system detects a problem while operating, the RDM system stops working, then the RDM indicator and the brake system indicator (amber) stay on.

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

Multi-Information Display (MID) Indication

The RDM system indicates its operation status on the MID in the gauge control module as below.

Self-Diagnostic Function

The RDM system has a self-diagnostic function. If the self-diagnostic function detects a malfunction, the RDM system stops operating, turns on the RDM indicator, 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 RDM 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 RDM 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 RDM 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 RDM automatically resumes operation.

Multipurpose Camera Unit

The multipurpose camera unit uses input from the camera, the PCM, the VSA modulator-control unit, and the steering angle sensor to warn the driver when the own vehicle departs from a lane. The multipurpose camera unit communicates with the gauge control module to send the 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 RDM indicator blinks.

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 RDM system will not operate even though it is OK. In this case, both RDM indicator and related unit indicator will come on and stay on.

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 RDM 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 RDM indicator does not come on.
	The RDM system sometimes stops operating because of the environment (weather, road conditions, driving conditions, etc.). A code may be stored in these cases:

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 RDM for DTCs.

Read and record the DTC:

	Freeze data indicates the RDM 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 DTCs 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.