Reading and Clearing Diagnostic Trouble Codes

How to Troubleshoot the Blind Spot Information System (BSI)

Blind Spot Information System (BSI) Indicator

When the BSI system is OK, the BSI indicator (A) comes on for about 3 seconds after pressing the engine start/stop button to select the ON mode.

When the BSI system detects a problem while in operation, the BSI system stops control. The BSI indicator comes on, and the BSI system indicates "CHECK BLIND SPOT SYSTEM" in the MID.










Blind Spot Information System (BSI) Alert Indicator

While the BSI system is working, the system turns on/blinks* the BSI alert indicator (A) when it detects another vehicle on either side toward the rear.

*: When the driver moves the turn signal lever toward the side with the BSI alert indicator on, the alert indicator blinks to alert the driver.






BSI OFF Switch

Pressing and holding the button on the BSI OFF switch (A) for at least 0.5 second turns the BSI system on or off.

To turn on the BSI system, press the engine start/stop button to select the ON mode, then press the BSI OFF button. The BSI indicator in the gauge control module goes off, and the BSI system indicates that it is turned on in the multi-information display (MID).

To turn off the BSI system, press the button on the BSI OFF switch again. The BSI indicator in the gauge control module comes on, and the BSI system indicates that it is turned off in the MID.






Multi-Information Display (MID) Indication

The BSI system indicates its operation status on the multi-information display (MID) (A) in the gauge control module as below.






BSI OFF/BSI ON

The BSI system indicates its condition for only 5 seconds when the system is turned on or off with the BSI OFF switch.






Clean the BSI Radar Units

When mud, dirt, wet snow, leaves, or other foreign material sticks to the side of the rear bumper, the BSI system stops control and indicates in the MID that the BSI radar units must be cleaned. It also turns on the BSI indicator at the same time, and stores the DTC(s).

When the obstruction or contamination is removed, the indicator in MID goes off and the BSI system automatically returns to ON.






Self-Diagnostic Function

The BSI system has a self-diagnostic function. If the self-diagnostic function detects a malfunction, the BSI system stops control, turns on the BSI indicator, and stores DTCs.

Blind Spot Information System (BSI) Control Unit

The BSI control unit uses input from the BSI radar units.
The BSI radar units also detects its own errors, and it signals the BSI control unit if an error is detected.

Blind Spot Information System (BSI) Radar Units

The BSI radar units are installed in the rear bumper on both sides of the vehicle. They detect other vehicles as they approach your vehicle from the rear sides, and they send this information to the BSI control unit.

CAN Communication

B-CAN

The BSI control unit is on the B-CAN, and it communicates with other units (AcuraLink, Gauge control module, MICU) via the B-CAN.

If the BSI control unit detects a communication error or a malfunction in another connected unit, the BSI system will not operate even though it is OK.

In this case, both BSI indicator and related unit indicator will come on and stay on.

BSI-CAN

BSI-CAN is used as a network connecting the BSI control unit and the BSI radar units.

When the BSI control unit does not properly receive information from the BSI-CAN, the BSI system stops control and turns on the BSI indicator.

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 BSI indicator does not come on during the test-drive, but troubleshooting is done 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 BSI indicator does not come on.
- The BSI system sometimes stops control because of the environment (weather, road conditions, driving conditions, etc.). A DTC may be stored in these cases.

SomeDTCs may be stored even when the system is OK.
For example, the BSI indicator may come on with one or more of these DTCs:







How to Retrieve DTCs

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

1. Press the engine start/stop button to select the OFF 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. Press the engine start/stop button to select the ON mode.

4. Make sure the HDS communicates with the vehicle and the BSI control unit. If it does not communicate, troubleshoot the DLC circuit Testing and Inspection.

5. Use the HDS to check for BSI DTCs.

6. Read and record the DTC.

7. Press the engine start/stop button to select the OFF mode, then wait for 10 seconds.

8. Disconnect the HDS from the DLC.

9. Do the troubleshooting procedure for the DTC.

How to Clear DTCs

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

1. Press the engine start/stop button to select the OFF 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. Press the engine start/stop button to select the ON mode.

4. Make sure the HDS communicates with the vehicle and the BSI control unit. If it does not communicate, troubleshoot the DLC circuit Testing and Inspection.

5. In the DRIVING SUPPORT MENU of the HDS, select BSI, then choose the Clear DTCs icon, and follow the prompts.

6. Press the engine start/stop button to select the OFF mode, then wait for 10 seconds.

7. Disconnect the HDS from the DLC.