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DTC B1828: Power Seat Recline Motor Pulse 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.
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 ).
  • If DTC B1827 and B1828 are both indicated, check for a blown No. 16 (20A) fuse in the under-dash fuse/relay box. If the fuse blows again, check for a short to ground in the recline motor circuit.
  1. Turn the ignition switch to LOCK (0) and then back to ON (II).
  2. Clear the DTCs with the HDS.
  3. Operate the power seat adjustment switch in all directions for at least 6 seconds each.
  4. Check for DTCs with the HDS.

    Is DTC B1828 indicated? 

    YES  -Go to step 5.

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

  5. Check for DTCs with the HDS.

    Is DTC B1836 also indicated? 

    YES  -Go to the DTC B1836 troubleshooting (see DTC B1836: POWER SEAT POSITION SENSOR CIRCUIT SHORT  ).

    NO  -Go to step 6.

  6. Check for DTCs with the HDS.

    Are DTCs B1825, B1826, and/or B1827 also indicated? 

    YES  -Go to step  17.

    NO  -Go to step 7.

  7. Turn the ignition switch to LOCK (0) and then back to ON (II).
  8. Operate the recline switch for 2 seconds, and check the recline motor operation.

    Does the recline motor run smoothly? 

    YES  -Go to step 9.

    NO  -Go to step  26.

  9. Turn the ignition switch to LOCK (0).
  10. Disconnect power seat control unit connector A (40P).
  11. Disconnect the driver's seat wire harness 8P [14P] connector.

    []: With seat ventilation

  12. Check for continuity between power seat control unit connector A (40P) terminals No. 10 and No. 29 and driver's seat wire harness 8P [14P] connector terminals No. 2 [No. 3] and No. 3 [No. 4] respectively.

    []: With seat ventilation

    Without seat ventilation 

    Fig 1: Checking Continuity Between 8P Connector Terminals And Connector (40P) Terminals
    G08053904Courtesy of AMERICAN HONDA MOTOR CO., INC.

    With seat ventilation 

    Fig 2: Checking Continuity Between Connector (40P) Terminals And 14P Connector Terminals
    G08053905Courtesy 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 A (40P) terminal No. 10 and body ground.
    Fig 3: Checking Continuity Between Connector (40P) Terminal 10 And Body Ground
    G08053906Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short to ground in the wire.

    NO  -Go to step 14.

  14. Reconnect power seat control unit connector A (40P).
  15. Turn the ignition switch to ON (II).
  16. Measure the voltage between driver's seat wire harness 8P [14P] connector terminals No. 3 [No. 4] (+) and No. 2 [No. 3] (-).

    []: With seat ventilation

    Without seat ventilation 

    Fig 4: Measuring Voltage Between 8P Connector Terminals No. 3 And No. 2
    G08053907Courtesy of AMERICAN HONDA MOTOR CO., INC.

    With seat ventilation 

    Fig 5: Measuring Voltage Between 14P Connector Terminals No. 4 And No. 3
    G08053908Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    YES  -Check for an open/short in the wire of the driver's seat subharness. If the harness is OK, replace the recline 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 to LOCK (0).
  18. Disconnect power seat control unit connector A (40P).
  19. Disconnect the driver's seat wire harness 8P [14P] connector.

    []: With seat ventilation

  20. Check for continuity between power seat control unit connector A (40P) terminals No. 15 and No. 29 and driver's seat wire harness 8P [14P] connector terminals No. 2 [No. 3] and No. 8 [No. 12] respectively.

    []: With seat ventilation

    Without seat ventilation 

    Fig 6: Checking Continuity Between Connector (40P) Terminals And 8P Connector Terminals
    G08053909Courtesy of AMERICAN HONDA MOTOR CO., INC.

    With seat ventilation 

    Fig 7: Checking Continuity Between Connector (40P) Terminals And 14P Connector Terminals
    G08053910Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 21.

    NO  -Repair an open in the wire.

  21. Disconnect the 4P connector from the slide position sensor, the front up-down position sensor, and the rear up-down position sensor.
  22. Check for continuity between body ground and driver's seat wire harness 8P [14P] connector terminal No. 8 [No. 12].

    []: With seat ventilation

    Without seat ventilation 

    Fig 8: Checking Continuity Between Body Ground And 8P Connector Terminal No. 8
    G08053911Courtesy of AMERICAN HONDA MOTOR CO., INC.

    With seat ventilation 

    Fig 9: Checking Continuity Between Body Ground And 14P Connector Terminal No. 12
    G08053912Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short to ground in the wire.

    NO  -Go to step 23.

  23. Reconnect power seat control unit connector A (40P).
  24. Turn the ignition switch to ON (II).
  25. Measure the voltage between power seat control unit connector A (40P) terminals No. 15 and No. 29.
    Fig 10: Measuring Voltage Between Connector (40P) Terminals No. 15 And No. 29
    G08053913Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage when the recline switch is operated? 

    YES  -Replace the recline motor/position sensor.

    NO  -Replace the power seat control unit.

  26. Turn the ignition switch to LOCK (0).
  27. Disconnect power seat control unit connector B (18P).
  28. Disconnect the driver's seat wire harness 8P [14P] connector.
  29. Check for continuity between power seat control unit connector B (18P) terminals No. 9 and No. 11 and driver's seat wire harness 8P [14P] connector terminals No. 4 [No. 8] and No. 5 [No. 9] respectively.

    []: With seat ventilation

    Without seat ventilation 

    Fig 11: Checking Continuity Between Connector B (18P) Terminals And 8P Connector Terminals
    G08053914Courtesy of AMERICAN HONDA MOTOR CO., INC.

    With seat ventilation 

    Fig 12: Checking Continuity Between Connector B (18P) Terminals And 14P Connector Terminals
    G08053915Courtesy 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 driver's seat wire harness 8P [14P] connector terminals No. 4 [No. 8] and No. 5 [No. 9] individually.

    []: With seat ventilation

    Without seat ventilation 

    Fig 13: Checking Continuity Between Body Ground And 8P Connector Terminals
    G08053916Courtesy of AMERICAN HONDA MOTOR CO., INC.

    With seat ventilation 

    Fig 14: Checking Continuity Between Body Ground And 14P Connector Terminals
    G08053917Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short to ground in the wire.

    NO  -Go to step 31.

  31. Do the recline motor test (see SLIDE MOTOR, FRONT UP-DOWN MOTOR. REAR UP-DOWN MOTOR  ).

    Is the motor OK? 

    YES  -Replace the power seat control unit.

    NO  -Replace the recline motor/position sensor.

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