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DTC B1825: Power Seat Slide 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 B1825 is stored when the slide switch is operated more than 1 second after the seat slides 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 all directions for at least 1 second each.
  4. Check for DTCs with the HDS.

    Is DTC B1825 indicated? 

    YES  -Go to step 5.

    NO  -Intermittent failure, the slide 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 B1826, B1827, and/or B1828 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 slide switch for at least 2 seconds, and check the slide motor operation.

    Does the slide 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 slide motor/position sensor 5P connector.
  13. Check for continuity between power seat control unit connector A (40P) terminals No. 11 No. 15, and No. 29 and slide motor 5P connector terminals No. 2, No. 3, and No. 4 respectively.
    Fig 1: Checking Continuity Between Power Seat Control Unit Connector A (40P) Terminals No. 11 No. 15, And No. 29
    G06160887Courtesy 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. 11 and body ground.
    Fig 2: Checking Continuity Between Power Seat Control Unit Connector A (40P) Terminal No. 11 And Body Ground
    G06160888Courtesy 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 slide motor/position sensor 5P connector terminals No. 4 and No. 5.
    Fig 3: Measuring Voltage Between Slide Motor/Position Sensor 5P Connector Terminals No. 4 And No. 5
    G06160889Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    YES  -Faulty slide motor/position sensor, replace the slide motor assembly.

    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).

  18. Turn ignition switch to LOCK (0).
  19. Disconnect power seat control unit connector A (40P).
  20. Disconnect the slide motor/position sensor 5P connector.
  21. Check for continuity between power seat control unit connector A (40P) terminals No. 15 and No. 29 and slide motor 5P connector terminals No. 2 and No. 3 respectively.
    Fig 4: Checking Continuity Between Power Seat Control Unit Connector A (40P) Terminals No. 15 And No. 29
    G06160890Courtesy 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
    G06160891Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage when the slide switch is operated? 

    YES  -Faulty slide motor/position sensor, replace the slide motor assembly 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 slide motor/position 5P connector.
  28. Check for continuity between power seat control unit connector B (18P) terminals No. 7 and No. 17 and slide motor 5P connector terminals No. 1 and No. 5 respectively.
    Fig 6: Checking Continuity Between Power Seat Control Unit Connector B (18P) Terminals No. 7 And No. 17
    G06160892Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 29.

    NO  -Repair open in the wire. I

  29. Check for continuity between body ground and slide/position sensor 5P connector terminals No. 1 and No. 5 individually.
    Fig 7: Checking Continuity Between Body Ground And Slide/Position Sensor 5P Connector Terminals No. 1 And No. 5
    G06160893Courtesy 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 slide motor test (see DRIVER'S POWER SEAT MOTOR TEST ).

    Is the motor OK? 

    YES  -Replace the power seat control unit.

    NO  -Replace the slide motor assembly.

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