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DTC B1828: Power Seat Recline 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 ).
  • DTC B1828 is stored when the recline switch is operated more than 1 second after the seat back reclines to the most forward or most backward position, even when the system is OK.
  1. Clear the DTCs with the HDS.
  2. Turn the ignition switch to LOCK (0), and then back to ON (II).
  3. Operate the power seat adjustment switch in each direction for at least 1 second each.
  4. Check for the 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 connectors.

  5. Check for DTCs with the HDS.

    Is DTC B1836 also indicated? 

    YES  -Troubleshoot DTC B1836 first (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  18.

    NO  -Go to step 7.

  7. Clear the DTCs with the HDS.
  8. Turn the ignition switch to LOCK (0), and then back to ON (II).
  9. Operate the recline switch for at least 2 seconds, and check the recline motor operation.

    Does the recline motor run smoothly? 

    YES  -Go to step 10.

    NO  -Go to step  25.

  10. Turn the ignition switch to LOCK (0).
  11. Disconnect power seat control unit connector A (40P).
  12. Disconnect the recline motor/position sensor 5P connector.
  13. Check for continuity between power seat control unit connector A (40P) terminals No. 10, No. 15, and No. 29 and recline motor/position sensor 5P connector terminals No. 3, No. 4, and No. 5 respectively.
    Fig 1: Checking Continuity Between Power Seat Control Unit Connector A (40P) Terminals No. 10, No. 15, And No. 29
    G06160908Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 14.

    NO  -Repair open in the wire.

  14. Check for continuity between power seat control unit connector A (40P) terminal No. 10 and body ground.
    Fig 2: Checking Continuity Between Power Seat Control Unit Connector A (40P) Terminal No. 10 And Body Ground
    G06160909Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair short to ground in the wire.

    NO  -Go to step 15.

  15. Reconnect power seat control unit connector A (40P).
  16. Turn the ignition switch to ON (II).
  17. Measure the voltage between recline motor/ position sensor 5P connector terminals No. 4 and No. 5.
    Fig 3: Measuring Voltage Between Recline Motor/ Position Sensor 5P Connector Terminals No. 4 And No. 5
    G06160910Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    YES  -Replace the recline motor/position sensor.

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

  18. Turn the ignition switch to LOCK (0).
  19. Disconnect power seat control unit connector A (40P).
  20. Disconnect the recline motor/position sensor 5P connector.
  21. Check for continuity between power seat control unit connector A (40P) terminals No. 15 and No. 29 and recline motor/position sensor 5P connector terminals No. 3 and No. 4 respectively.
    Fig 4: Checking Continuity Between Power Seat Control Unit Connector A (40P) Terminals No. 15 And No. 29
    G06160911Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 22.

    NO  -Repair open in the wire.

  22. Reconnect power seat control unit connector A (40P).
  23. Turn the ignition switch to ON (II).
  24. Measure the voltage between power seat control unit connector A (40P) terminals No. 15 and No. 29.
    Fig 5: Measuring Voltage Between Power Seat Control Unit Connector A (40P) Terminals No. 15 And No. 29
    G06160912Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage when the recline switch is operated? 

    YES  -Replace the recline motor/position sensor, and recheck for DTCs.

    NO  -Replace the power seat control unit.

  25. Turn the ignition switch to LOCK (0).
  26. Disconnect power seat control unit connector B (18P).
  27. Disconnect the recline motor/position sensor 5P connector.
  28. Check for continuity between power seat control unit connector B (18P) terminals No. 9 and No. 11 and recline motor/position sensor 5P connector terminals No. 1 and No. 2 respectively.
    Fig 6: Checking Continuity Between Power Seat Control Unit Connector B (18P) Terminals No. 9 And No. 11
    G06160913Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 29.

    NO  -Repair open in the wire.

  29. Check for continuity between body ground and recline/position sensor 5P connector terminals No. 1 and No. 2 individually.
    Fig 7: Checking Continuity Between Body Ground And Recline/Position Sensor 5P Connector Terminals No. 1
    G06160914Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair short to ground in the wire.

    NO  -Go to step 30.

  30. Do the recline motor test (see DRIVER'S POWER SEAT MOTOR TEST ).

    Is the motor OK? 

    YES  -Replace the power seat control unit.

    NO  -Replace the recline motor/position sensor.

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