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DTC B18BC: BSI Radar Units Communication Error

WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Clear the DTCs  with the HDS (see General Troubleshooting Information  ).
  2. Turn the ignition switch to ON (II), then wait for 10 seconds.
  3. Check for DTCs  with the HDS (see General Troubleshooting Information  ).

    Is DTC B18BC indicated? 

    YES  -Go to step 4.

    NO  -Intermittent failure, the system is OK at this time.

  4. Turn the ignition switch to LOCK (0).
  5. Disconnect the left BSI radar unit 6P connector.
  6. Disconnect the right BSI radar unit 6P connector.
  7. Disconnect the BSI control unit 16P connector.
  8. Check for continuity between BSI control unit 16P connector terminal No. 3 and body ground.
    Fig 1: Checking Continuity Between BSI Control Unit 16P Connector Terminal No. 3 And Body Ground
    G08055708Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short to ground in the wire between the BSI control unit and the branch of the BSI-CAN line (BSI-CAN H).

    NO  -Go to step 9.

  9. Check for continuity between BSI control unit 16P connector terminals No. 2 and No. 3.
    Fig 2: Checking Continuity Between BSI Control Unit 16P Connector Terminals No. 2 And No. 3
    G08055709Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the BSI-CAN H line and the BSI-CAN L line.

    NO  -Go to step 10.

  10. Turn the ignition switch to ON (II).
  11. Measure the voltage between BSI control unit 16p connector terminal No. 2 and body ground. There should be less than 0.2 V.
    Fig 3: Measuring Voltage Between BSI Control Unit 16P Connector Terminal No. 2 And Body Ground
    G08055710Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is the voltage as specified? 

    YES  -Go to step 12.

    NO  -Repair a short to power in the wire between the BSI control unit and the branch of the BSI-CAN line (BSI-CAN L).

  12. Turn the ignition switch to LOCK (0).
  13. Reconnect the BSI control unit 16P connector.
  14. Measure the resistance between BSI control unit 16P connector terminals No. 2 and No. 3. There should be an open circuit or at least 1 MΩ.
    Fig 4: Measuring Resistance Between BSI Control Unit 16P Connector Terminals No. 2 And No. 3
    G08055711Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is the resistance as specified? 

    YES  -Go to step 15.

    NO  -Replace the BSI control unit 

  15. Reconnect the right BSI radar unit 6P connector.
  16. Clear the DTCs  with the HDS (see General Troubleshooting Information  ).
  17. Turn the ignition switch to ON (II), then wait for 10 seconds.
  18. Check for DTCs  with the HDS (see General Troubleshooting Information  ).

    Is DTC B18BC indicated? 

    YES  -Replace the right BSI radar unit 

    NO  -Replace the left BSI radar unit 

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