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Home >> Acura >> 2007 >> RL >> Repair and Diagnosis >> Body & Frame >> Windows >> Power Windows >> DTC Troubleshooting >> DTC B2188: Communication Line (UART Line) Circuit Open

DTC B2188: Communication Line (UART Line) Circuit Open

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
  1. Clear the DTCs with the HDS.
  2. Turn the ignition switch OFF, and then back ON (II).
  3. Open and close the each window by operating the front passenger's, left rear, and right rear power window switches.
  4. Check for DTCs with the HDS.

    Is DTC B2188 indicated, and does the any window fail to open or close? 

    YES  - Go to step 5.

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

  5. Turn the ignition switch OFF.
  6. Disconnect these connectors:
    • Driver's MPCS unit connector A (40P)
    • Power window master switch 6P connector
    • Front passenger's MPCS unit connector A (28P)
    • Left rear power window switch 14P connector
    • Right rear power window switch 14P connector
  7. Connect driver's MPCS unit connector A (40P) terminal No. 8 to body ground with a jumper wire.
    Fig 1: Connecting Driver's MPCS Unit Connector A (40P) Terminal No. 8 To Body Ground With Jumper Wire
    G05497069Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Check for continuity between front passenger's MPCS unit connector A (28P) terminal No. 4 and body ground.
    Fig 2: Checking Continuity Between Front Passenger's MPCS Unit Connector A (28P) Terminal No. 4 And Body Ground
    G05497070Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step 9.

    NO  - Repair an open in the wire, or replace the faulty passenger's under-dash fuse/relay box.

  9. Check for continuity between right rear power window switch 14P connector terminal No. 2 and body ground.
    Fig 3: Checking Continuity Between Right Rear Power Window Switch 14P Connector Terminal No. 2 And Body Ground
    G05497071Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step 10.

    NO  - Repair an open in the wire, or replace the faulty passenger's under-dash fuse/relay box.

  10. Check for continuity between left rear power window switch 14P connector terminal No. 2 and body ground.
    Fig 4: Checking Continuity Between Left Rear Power Window Switch 14P Connector Terminal No. 2 And Body Ground
    G05497072Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step 11.

    NO  - Repair an open in the wire.

  11. Remove the jumper wire from the driver's MPCS unit connector A (40P).
  12. Check for continuity between driver's MPCS unit connector A (40P) terminal No. 8 and power window master switch 6P connector terminal No. 6.
    Fig 5: Checking Continuity Between (40P) terminal No. 8 And (6P) Connector Terminal No. 6
    G05497073Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step 13.

    NO  - Repair an open in the wire.

  13. Substitute a known-good power window master switch, and do the power window control unit learning procedure (see RESETTING THE POWER WINDOW CONTROL UNIT  ).
  14. Connect these connectors:
    • Driver's MPCS unit connector A (40P)
    • Front passenger's MPCS unit connector A (28P)
    • Left rear power window switch 14P connector
    • Right rear power window switch 14P connector
  15. Turn the ignition switch ON (II).
  16. Clear the DTCs with the HDS.
  17. Open and close the each window by operating the power window master switch.
  18. Check for DTCs with the HDS.

    Is DTC B2188 indicated? 

    YES  - Go to step 19.

    NO  - The original power window master switch is faulty; replace it.

  19. Turn the ignition switch OFF.
  20. Substitute a known-good front passenger's MPCS unit.
  21. Turn the ignition switch ON (II).
  22. Clear the DTCs with the HDS.
  23. Open and close the front passenger's power window by operating the front passenger's power window switch.
  24. Check for DTCs with the HDS.

    Is DTC B2188 indicated? 

    YES  - Go to step 25.

    NO  - The original front passenger's MPCS unit is faulty; replace it.

  25. Turn the ignition switch OFF.
  26. Substitute a known-good left rear power window switch.
  27. Turn the ignition switch ON (II).
  28. Clear the DTCs with the HDS.
  29. Open and close the left rear power window by operating the left rear power window switch.
  30. Check for DTCs with the HDS.

    Is DTC B2188 indicated? 

    YES  - Go to step 31.

    NO  - The original left rear power window switch is faulty; replace it.

  31. Turn the ignition switch OFF.
  32. Substitute a known-good right rear power window switch.
  33. Turn the ignition switch ON (II).
  34. Clear the DTCs with the HDS.
  35. Open and close the right rear power window by operating the right rear power window switch.
  36. Check for DTCs with the HDS.

    Is DTC B2188 indicated? 

    YES  - Replace the driver's MPCS unit.

    NO  - The original right rear power window power switch is faulty; replace it.

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