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DTC B1826: Power Seat Front 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. 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.
    NOTE: DTC B1826 is stored when the front up-down switch is operated more than 1 second after the seat moves to the most up or most down position, even when the system is OK.
  4. Check for DTCs with the HDS.

    Is DTC B1826 indicated? 

    YES  -Go to step 5.

    NO  -Intermittent failure, the front up-down 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  -Go to the DTC B1836 TROUBLESHOOTING  .

    NO  -Go to step 6.

  6. Check for DTCs with the HDS.

    Are DTCs B1825, B1827 and/or B1828 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 front up-down switch for 2 seconds, and check the front up-down motor operation.

    Does the front up-down 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 front up-down motor/position sensor 6P connector.
  12. Check for continuity between power seat control unit connector B (40P) terminals No. 12 and No. 29 and front up-down motor/position sensor 6P connector terminals No. 1 and No. 3 respectively.
    Fig 1: Checking Continuity Between Power Seat Control Unit Connector B (40P) Terminals No. 12 And 29 And Front Up-Down Motor/Position Sensor 6P Connector Terminals No. 1 And 3
    G08089360Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 13.

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

  13. Check for continuity between power seat control unit connector B (40P) terminal No. 12 and body ground.
    Fig 2: Checking Continuity Between Power Seat Control Unit Connector B (40P) Terminal No. 12 And Body Ground
    G08089361Courtesy 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 B (40P).
  15. Turn the ignition switch to ON (II).
  16. Measure the voltage between front up-down motor/position sensor 6P connector terminals No. 1 (+) and No. 3 (-).
    Fig 3: Measuring Voltage Between Front Up-Down Motor/Position Sensor 6P Connector Terminals No. 1 (+) And 3 (-)
    G08089362Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    YES  -Faulty front up-down motor/position sensor; replace the seat frame assembly (see FRONT SEAT FRAME 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 a short in the wire (sensor line).

  17. Turn the ignition switch to LOCK (0).
  18. Disconnect power seat control unit connector B (40P).
  19. Disconnect the front up-down motor/position sensor 6P connector.
  20. Check for continuity between power seat control unit connector B (40P) terminals No. 15 and No. 29 and front up-down motor/position sensor 6P connector terminals No. 4 and No. 3 respectively.
    Fig 4: Checking Continuity Between Power Seat Control Unit Connector B (40P) Terminals No. 15 And 29 And Front Up-Down Motor/Position Sensor 6P Connector Terminals No. 4 And 3
    G08089363Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 21.

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

  21. Disconnect the 6P connector from the slide motor/position sensor and the rear up-down motor/position sensor, then disconnect the recline motor/position sensor 8P connector.
  22. Check for continuity between body ground and front up-down motor/position sensor 6P connector terminal No. 4.
    Fig 5: Checking Continuity Between Body Ground And Front Up-Down Motor/Position Sensor 6P Connector Terminal No. 4
    G08089364Courtesy 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 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.
    Fig 6: Measuring Voltage Between Power Seat Control Unit Connector B (40P) Terminals No. 15 And 29
    G08089365Courtesy of AMERICAN HONDA MOTOR CO., INC.

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

    YES  -Faulty front up-down motor/position sensor; replace the seat frame assembly (see FRONT SEAT FRAME REPLACEMENT ).

    NO  -Replace the power seat control unit (see POWER SEAT CONTROL UNIT INPUT TEST/REPLACEMENT  ).

  26. Check the No. 10 (20 A) fuse in the auxiliary under-hood fuse/relay box.

    Is the 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 front up-down switch.
    Fig 7: Measuring Voltage To Body Ground At Power Seat Control Unit Connector A (18P) Terminals No. 4 And 18
    G08089366Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 0.2 V or more? 

    YES  -Repair an open or high resistance in the wire between the power seat control unit and body ground (G503).

    NO  -Go to step 28.

  28. Turn the ignition switch to LOCK (0).
  29. Disconnect power seat control unit connector A (18P).
  30. Disconnect the front up-down motor/position sensor 6P connector.
  31. Check for continuity between power seat control unit connector A (18P) terminals No. 6 and No. 16 and front up-down motor/position sensor 6P connector terminals No. 5 and No. 6 respectively.
    Fig 8: Checking Continuity Between Power Seat Control Unit Connector A (18P) Terminals No. 6 And 16
    G08089367Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 32.

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

  32. Check for continuity between body ground and front up-down motor/position sensor 6P connector terminals No. 5 and No. 6 individually.
    Fig 9: Checking Continuity Between Body Ground And Front Up-Down Motor/Position Sensor 6P Connector Terminals No. 5 And 6
    G08089368Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short to ground in the wire.

    NO  -Go to step 33.

  33. Test the front up-down 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  -Faulty front up-down motor/position sensor; replace the seat frame assembly (see FRONT SEAT FRAME REPLACEMENT ).

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