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Home >> Acura >> 2007 >> TL Base >> Repair and Diagnosis (Single Page) >> Body & Frame >> Seats >> Driver Position Memory System (DPMS) >> DTC Troubleshooting >> DTC B1827: Power Seat Rear Up-down Motor Pulse Error
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DTC B1827: Power Seat Rear Up-down Motor Pulse Error

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. Turn the ignition switch OFF and then back ON (II).
  2. Clear the DTCs with the HDS.
  3. Operate the power seat adjustment switch in each direction for more than 1 second.
  4. Check for the DTCs with the HDS.

    Is DTC B1827 indicated? 

    YES  -Go to step 5.

    NO  -Intermittent failure. The rear up-down motor/ position sensor is OK at this time. Check for loose or poor connections at the power seat control unit connector.

  5. Clear the DTCs with the HDS.

    Are DTCs B1825, B1826 and/or B1828 also indicated? 

    YES  -Go to step  17.

    NO  -Go to step 6.

  6. Clear the DTCs with the HDS.
  7. Turn the ignition switch OFF and then back ON (II).
  8. Operate the rear up-down switch for 2 seconds, and check the rear up-down motor operation.

    Does the rear up-down motor run smoothly? 

    YES  -Go to step 9.

    NO  -Go to step  26.

  9. Turn the ignition switch OFF.
  10. Disconnect power seat control unit connector C (12P).
  11. Disconnect the rear up-down motor/position sensor 5P connector.
  12. Check for continuity between power seat control unit connector C (12P) No. 11 and No. 12 terminals and rear up-down motor/position sensor 5P connector No. 5 and No. 4 terminals individually.
    Fig 1: Checking Continuity Between Power Seat Control Unit Connector C (12P) No. 11 And No. 12 Terminals
    G05462914Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 13.

    NO  -Repair an open in the wire.

  13. Check for continuity between power seat control unit connector C (12P) No. 11 terminal and body ground.
    Fig 2: Checking Continuity Between Power Seat Control Unit Connector C (12P) No. 11 Terminal And Body Ground
    G05462915Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire.

    NO  -Go to step 14.

  14. Reconnect power seat control unit connector C (12P).
  15. Turn the ignition switch ON (II).
  16. Measure the voltage between rear up-down motor/ position sensor 5P connector No. 5 (+) and No. 4 (-) terminals.
    Fig 3: Measuring Voltage Between Rear Up-Down Motor/ Position Sensor 5P Connector No. 5 (+) And No. 4 (-) Terminals
    G05462916Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    YES  -Replace the rear up-down motor/position sensor.

    NO  -If there is no voltage, replace the power seat control unit. If there is battery voltage, repair a short in the wire (sensor line).

  17. Turn the ignition switch OFF.
  18. Disconnect power seat control unit connector C (12P).
  19. Disconnect the rear up-down motor/position sensor 5P connector.
  20. Check for continuity between power seat control unit connector C (12P) No. 6 and No. 12 terminals and rear up-down motor/position sensor 5P connector No. 3 and No. 4 terminals individually.
    Fig 4: Checking Continuity Between Power Seat Control Unit Connector C (12P) No. 6 And No. 12 Terminals
    G05462917Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 21.

    NO  -Repair an open in the wire.

  21. Disconnect the slide position sensor 3P connector and each 5P connector from the recline motor/ position sensor and the front up-down motor/ position sensor.
  22. Check for continuity between rear up-down motor/ position sensor No. 3 terminal and body ground.
    Fig 5: Checking Continuity Between Rear Up-Down Motor/ Position Sensor No. 3 Terminal And Body Ground
    G05462918Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire.

    NO  -Go to step 23.

  23. Reconnect power seat control unit connector C (12P).
  24. Turn the ignition switch ON (II).
  25. Measure the voltage between power seat control unit connector C (12P) No. 6 and No. 12 terminals.
    Fig 6: Measuring Voltage Between Power Seat Control Unit Connector C (12P) No. 6 And No. 12 Terminals
    G05462919Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage when the rear up-down switch is operated? 

    YES  -Replace the rear up-down motor/position sensor.

    NO  -Replace the power seat control unit.

  26. Turn the ignition switch OFF.
  27. Disconnect power seat control unit connector D (6P).
  28. Disconnect the rear up-down motor/position sensor 5P connector.
  29. Check for continuity between power seat control unit connector D (6P) No. 5 and No. 2 terminals and rear up-down motor/position sensor 5P connector No. 1 and No. 2 terminals individually.
    Fig 7: Checking Continuity Between Power Seat Control Unit Connector D (6P) No. 5 And No. 2 Terminals
    G05462920Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 30.

    NO  -Repair an open in the wire.

  30. Check for continuity between body ground and rear up-down motor/position sensor 5P connector No. 1 and No. 2 terminals individually.
    Fig 8: Checking Continuity Between Body Ground And Rear Up-Down Motor/Position Sensor 5P Connector No. 1 And No. 2 Terminals
    G05462921Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire.

    NO  -Go to step 31.

  31. Test the rear up-down motor (see DRIVER'S POWER SEAT MOTOR TEST  ).

    Is the motor OK? 

    YES  -Replace the power seat control unit.

    NO  -Replace the rear up-down motor/position sensor.

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