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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 ).
  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 all directions for more than 1 second each.

    DTC B1828 can be stored if the seat recline switch is held on for more than 1 second after the seat reaches the end of its travel, even when the system is OK.

  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 connector. ■

  5. Check for DTCs with the HDS.

    Is DTC B1836 also indicated? 

    YES  - Troubleshoot DTC B1836 first. ■

    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 B (40P).
  11. Disconnect the recline motor/position sensor 8P connector.
  12. Check for continuity between power seat control unit connector B (40P) terminals No. 10 and No. 29 and recline motor/position sensor 8P connector terminals No. 8 and No. 7 respectively.

    Is there continuity? 

    YES  - Go to step  13.

    NO  - Repair an open or high resistance in the wire. ■

    Fig 1: Checking Continuity Between Power Seat Control Unit Connector B (40P) Terminals No. 10 & No. 29
    G05966654Courtesy of AMERICAN HONDA MOTOR CO., INC.
  13. Check for continuity between power seat control unit connector B (40P) terminal No. 10 and body ground.

    Is there continuity? 

    YES  - Repair a short to ground in the wire. ■

    NO  - Go to step  14.

    Fig 2: Checking Continuity Between Power Seat Control Unit Connector B (40P) Terminal No. 10 & Body Ground
    G05966655Courtesy of AMERICAN HONDA MOTOR CO., INC.
  14. Reconnect power seat control unit connector B (40P).
  15. Turn the ignition switch to ON (II).
  16. Measure the voltage between recline motor/position sensor 8P connector terminals No. 8 (+) and No. 7 (-).

    Is there about 5 V? 

    YES  - Faulty recline motor/position sensor, replace it (see FRONT SEAT RECLINE MOTOR REPLACEMENT ). ■

    NO  - If there is no voltage, replace the power seat control unit (see Power Seat Control Unit Input Test/Replacement  ). If there is battery voltage, repair short in the wire (sensor line). ■

    Fig 3: Measuring Voltage Between Recline Motor/Position Sensor 8P Connector Terminals No. 8 & No. 7
    G05966656Courtesy of AMERICAN HONDA MOTOR CO., INC.
  17. Turn the ignition switch to LOCK (0).
  18. Disconnect power seat control unit connector B (40P).
  19. Disconnect the recline motor/position sensor 8P connector.
  20. Check for continuity between power seat control unit connector B (40P) terminals No. 15 and No. 29 and recline motor/position sensor 8P connector terminals No. 5 and No. 7 respectively.

    Is there continuity? 

    YES  - Go to step  21.

    NO  - Repair an open or high resistance in the wire. ■

    Fig 4: Checking Continuity Between Power Seat Control Unit Connector B (40P) Terminals No. 15 & No. 29
    G05966657Courtesy of AMERICAN HONDA MOTOR CO., INC.
  21. Disconnect the 6P connector from the slide motor/position sensor, the front up-down motor/position sensor, and the rear up-down motor/position sensor.
  22. Check for continuity between body ground and recline motor/position sensor 8P connector terminal No. 5.

    Is there continuity? 

    YES  - Repair a short to ground in the wire. ■

    NO  - Go to step  23.

    Fig 5: Checking Continuity Between Body Ground & Recline Motor/Position Sensor 8P Connector Terminal No. 5
    G05966658Courtesy of AMERICAN HONDA MOTOR CO., INC.
  23. Reconnect power seat control unit connector B (40P).
  24. Turn the ignition switch to ON (II).
  25. Measure the voltage between power seat control unit connector B (40P) terminals No. 15 and No. 29.

    Is there battery voltage when the recline switch is operated? 

    YES  - Replace the recline motor/position sensor (see FRONT SEAT RECLINE MOTOR REPLACEMENT ). ■

    NO  - Replace the power seat control unit (Power Seat Control Unit Input Test/Replacement  ). ■

    Fig 6: Measuring Voltage Between Power Seat Control Unit Connector B (40P) Terminals No. 15 & No. 29
    G05966659Courtesy of AMERICAN HONDA MOTOR CO., INC.
  26. Check the No. 9 (20A) fuse in the auxiliary under-hood fuse box.

    Is fuse OK? 

    YES  - Go to step 27.

    NO  - Replace the fuse. ■

  27. Measure the voltage to body ground at power seat control unit connector A (18P) terminals No. 4 and No. 18 when operating the recline switch.

    Is there 0.2 V or more? 

    YES  - Repair an open or high resistance in the wire between the power seat control unit and G503. ■

    NO  - Go to step 28. ■

    Fig 7: Power Seat Control Unit Connector A (18P) Terminals No. 4 And No. 18
    G00511821Courtesy of AMERICAN HONDA MOTOR CO., INC.
  28. Turn the ignition switch to LOCK (0).
  29. Disconnect power seat control unit connector A (18P).
  30. Disconnect the recline motor/position sensor 8P connector.
  31. Check for continuity between power seat control unit connector A (18P) terminals No. 9 and No. 11 and recline motor/position sensor 8P connector terminals No. 4 and No. 6 respectively.

    Is there continuity? 

    YES  - Go to step 32.

    NO  - Repair an open or high resistance in the wire. ■

    Fig 8: Checking Continuity Between Power Seat Control Unit Connector A (18P) Terminals No. 9 & No. 11
    G05966660Courtesy of AMERICAN HONDA MOTOR CO., INC.
  32. Check for continuity between body ground and recline motor/position sensor 8P connector terminals No. 4 and No. 6 individually.

    Is there continuity? 

    YES  -Repair a short to ground in the wire. ■

    NO  - Go to step 33.

    Fig 9: Checking Continuity Between Body Ground & Recline Motor/Position Sensor 8P Connector Terminals No. 4 & No. 6
    G05966661Courtesy of AMERICAN HONDA MOTOR CO., INC.
  33. Test the recline motor (see DRIVER'S POWER SEAT MOTOR TEST  ).

    Is the motor OK? 

    YES  -Replace the power seat control unit (see Power Seat Control Unit Input Test/Replacement  )■

    NO  -Replace the recline motor/position sensor (see FRONT SEAT RECLINE MOTOR REPLACEMENT ). ■

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