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Home >> Acura >> 2012 >> MDX >> Repair and Diagnosis >> Electrical >> Gauges >> Blind Spot Information System (BSI) >> DTC Troubleshooting >> DTC B18B6: Lost Communication with Left BSI Radar Unit; DTC B18B7: Lost Communication with Right BSI Radar Unit

DTC B18B6: Lost Communication with Left BSI Radar Unit; DTC B18B7: Lost Communication with Right BSI Radar Unit

  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 B18B6 or B18B7 indicated? 

    YES  -Go to step 4.

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

  4. Check for DTCs  with the HDS (see General Troubleshooting Information  .

    Are DTC B18B6 and B18B7 indicated? 

    YES  -Go to step 5.

    NO  -

    • Only DTC B18B6 is indicated, go to step  24.
    • Only DTC B18B7 is indicated, go to step  32.

  5. Turn the ignition switch to LOCK (0).
  6. Disconnect the left BSI radar unit 6P connector.
  7. Turn the ignition switch to ON (II).
  8. Measure the voltage between left BSI radar unit 6P connector terminals No. 2 and No. 5. There should be battery voltage.
    Fig 1: Measuring Voltage Between Left BSI Radar Unit 6P Connector Terminals No. 2 And No. 5
    G08055696Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step  10.

    NO  -Go to step 9.

  9. Measure the voltage between left BSI radar unit 6P connector terminal No. 2 and body ground. There should be battery voltage.
    Fig 2: Measuring Voltage Between Left BSI Radar Unit 6P Connector Terminal No. 2 And Body Ground
    G08055697Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Repair an open in the wire or poor ground (G702).

    NO  -Repair an open in the wire between the BSI control unit and the branch of the +B TECH (10A) line.

  10. Turn the ignition switch to LOCK (0).
  11. Disconnect the right BSI radar unit 6P connector.
  12. Disconnect the BSI control unit 16P connector.
  13. Check for continuity between BSI control unit 16P connector terminal No. 2 and body ground.
    Fig 3: Checking Continuity Between BSI Control Unit 16P Connector Terminal No. 2 And Body Ground
    G08055698Courtesy 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 L).

    NO  -Go to step 14.

  14. Turn the ignition switch to ON (II).
  15. Measure the voltage between BSI control unit 16P connector terminal No. 3 and body ground. There should be less than 0.2 V.
    Fig 4: Measuring Voltage Between BSI Control Unit 16P Connector Terminal No. 3 And Body Ground
    G08055699Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is the voltage as specified? 

    YES  -Go to step 16.

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

  16. Turn the ignition switch to LOCK (0).
  17. Check for continuity between BSI control unit 16P connector terminal No. 3 and left BSI radar unit 6P connector terminal No. 3, and between BSI control unit 16P connector terminal No. 2 and left BSI radar unit 6P connector terminal No. 1.
    Fig 5: Measuring Resistance Between BSI Control Unit 16P Connector And Left BSI Radar Unit 6P Connector
    G08055700Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 18.

    NO  -Repair an open in the wire between the BSI control unit and the branch of the BSI-CAN line (BSI-CAN H, BSI-CAN L).

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

    Are DTC B18B6 and B18B7 indicated? 

    YES  -Replace the right BSI radar unit  .

    NO  -Replace the left BSI radar unit  .

  24. Turn the ignition switch to LOCK (0).
  25. Disconnect the left BSI radar unit 6P connector.
  26. Turn the ignition switch to ON (II).
  27. Measure the voltage between left BSI radar unit 6P connector terminals No. 2 and No. 5. There should be battery voltage.
    Fig 6: Measuring Voltage Between Left BSI Radar Unit 6P Connector Terminals No. 2 And No. 5
    G08055701Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 28.

    NO  -Go to step  31.

  28. Turn the ignition switch to LOCK (0).
  29. Disconnect the BSI control unit 16P connector.
  30. Check for continuity between BSI control unit 16P connector terminal No. 3 and left BSI radar unit 6P connector terminal No. 3, and between BSI control unit 16P connector terminal No. 2 and left BSI radar unit 6P connector terminal No. 1.
    Fig 7: Measuring Resistance Between BSI Control Unit 16P Connector And Left BSI Radar Unit 6P Connector
    G08055702Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Replace the left BSI radar unit  .

    NO  -Repair an open in the wire between the BSI control unit and the left BSI radar unit.

  31. Measure the voltage between left BSI radar unit 6P connector terminal No. 2 and body ground. There should be battery voltage.
    Fig 8: Measuring Voltage Between Left BSI Radar Unit 6P Connector Terminal No. 2 And Body Ground
    G08055703Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Repair an open in the wire between the left BSI radar unit and body ground (G702).

    NO  -Repair art-open in the wire between the tech relay in the auxiliary under-hood fuse/relay box and the left BSI radar unit.

  32. Turn the ignition switch to LOCK (0).
  33. Disconnect the right BSI radar unit 6P connector.
  34. Turn the ignition switch to ON (II), then wait for 10 seconds.
  35. Measure the voltage between right BSI radar unit 6P connector terminals No. 2 and No. 5. There should be battery voltage.
    Fig 9: Measuring Voltage Between Right BSI Radar Unit 6P Connector Terminals No. 2 And No. 5
    G08055704Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 36.

    NO  -Go to step  41.

  36. Turn the ignition switch to LOCK (0).
  37. Measure the resistance between body ground and right BSI radar unit 6P connector terminals No. 4 and No. 6 individually. There should be less than 1.0 Ω.
    Fig 10: Measuring Resistance Between Body Ground And Right BSI Radar Unit 6P Connector Terminals
    G08055705Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is the resistance as specified? 

    YES  -Go to step 38.

    NO  -Repair an open in the wire between the right BSI radar unit and body ground (G702).

  38. Make sure the ignition switch in LOCK (0).
  39. Disconnect the BSI control unit 16P connector.
  40. Check for continuity between BSI control unit 16P connector terminal No. 3 and right BSI radar unit 6P connector terminal No. 3, and between BSI control unit 16P connector terminal No. 2 and right BSI radar unit 6P connector terminal No. 1.
    Fig 11: Measuring Resistance Between BSI Control Unit 16P Connector And Right BSI Radar Unit 6P Connector
    G08055706Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Replace the right BSI radar unit  .

    NO  -Repair an open in the wire between the BSI control unit and the right BSI radar unit.

  41. Measure the voltage between right BSI radar unit 6P connector terminal No. 2 and body ground. There should be battery voltage.
    Fig 12: Measuring Voltage Between Right BSI Radar Unit 6P Connector Terminal No. 2 And Body Ground
    G08055707Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Repair an open in the wire between the right BSI radar unit and body ground (G702).

    NO  -Repair an open in the wire between the tech relay in the auxiliary under-hood fuse/relay box and the right BSI radar unit.

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