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Home >> Acura >> 2007 >> TSX Standard >> Repair and Diagnosis >> Accessories & Equipment >> Memory Modules >> Driver Position Memory System (DPMS) >> DTC Troubleshooting >> DTC B1826: Power Seat Front Up-down Motor Pulse Error ('06 model)

DTC B1826: Power Seat Front Up-down Motor Pulse Error ('06 model)

NOTE:
  • Make sure you have the latest software on the HDS before troubleshooting.
  • If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnostic Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
  • DTC B1826 can be set and stored when the front up-down switch is operated for more than 1 second after the seat has moved to the fully upper or down positions, even if the system is OK.
  1. Turn the ignition switch OFF, and then back ON (II).
  2. Clear the DTCs with the HDS.
  3. Operate the power seat adjustment switch in all directions.
    NOTE: Do not hold the switch for more than 1 second after the seat reaches a position limit or a DTC will beset.
  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 and pin fit at the power seat control unit connector. Check the battery condition, battery cable connections, and ground G601.

  5. Check for DTCs with the HDS.

    Is DTC B1836 also indicated? 

    YES  - Go to 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  16.

    NO  - Go to step 7.

  7. Operate the front up-down switch and check the front up-down motor operation.
    NOTE: Do not hold the switch for more than 1 second after the seat reaches a position limit or a DTC will be set.

    Does the front up-down motor run smoothly? 

    YES  - Go to step 8.

    NO  - Go to step  17.

  8. Turn the ignition switch OFF.
  9. Disconnect power seat control unit connector A (40P).
  10. Disconnect the front up-down motor/position sensor 5P connector.
  11. Check for continuity between power seat control unit connector A (40P) No. 12 and No. 29 terminals and front up-down motor/position sensor 5P connector No. 4 and No. 5 terminals.
    Fig 1: Checking Continuity Between Power Seat Control Unit Connector A (40P) No. 12 And No. 29 Terminals
    G05489111Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step 12.

    NO  - Repair open in the wire.

  12. Check for continuity between power seat control unit connector A (40P) No. 12 terminal and body ground.
    Fig 2: Checking Continuity Between Power Seat Control Unit Connector A (40P) No. 12 Terminal And Body Ground
    G05489112Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair short in the wire to body ground.

    NO  - Go to step 13.

  13. Reconnect power seat control unit connector A (40P).
  14. Turn the ignition switch ON (II).
  15. Measure the voltage between the front up-down motor/position sensor 5P connector No. 3 (+) and No. 4 (-) terminals.
    Fig 3: Measuring Voltage Between 5P Connector No. 3 And No. 4 Terminals
    G05489113Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 10 V? 

    YES  - Replace the front up-down motor/position sensor.

    NO  - Check for an open in the WHT/BLK wire between front up-down motor/position sensor 5P connector No. 3 terminal and power seat control unit connector A (40P) No. 15 terminal. If the wire is OK, substitute a known-good power seat control unit. If the problem is still present, substitute a known-good front up-down motor/position sensor. If the problem is repaired, replace the power seat control unit or front up-down motor/position sensor.

  16. Measure the voltage between power seat control unit connector A (40P) No. 15 and No. 29 terminals.
    Fig 4: Measuring Voltage Between Power Seat Control Unit Connector A (40P) No. 15 And No. 29 Terminals
    G05489114Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 10 V when the front up-down switch is operated? 

    YES  - Replace the front up-down motor/position sensor.

    NO  - Check the terminal fit. If they are OK, replace the power seat control unit.

  17. Turn the ignition switch OFF.
  18. Disconnect power seat control unit connector B (18P).
  19. Disconnect the front up-down motor/position sensor 5P connector.
  20. Check for continuity between power seat control unit connector B (18P) No. 6 and 16 terminals and front up-down motor/position sensor 5P connector No. 1 and No. 2 terminals.
    Fig 5: Checking Continuity Between Power Seat Control Unit Connector B (18P) No. 6 And 16 Terminals
    G05489115Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step 21.

    NO  - Repair an open in the wire.

  21. Check for continuity between the front up-down motor/position sensor 5P connector No. 1 and No. 2 terminals and body ground.
    Fig 6: Checking Continuity Between Front Up-Down Motor/Position Sensor 5P Connector No. 1 And No. 2 Terminals And Body Ground
    G05489116Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair a short in the wire.

    NO  - Go to step 22.

  22. Perform the front up-down motor test (see DRIVER'S POWER SEAT MOTOR TEST  ).

    Is the motor OK? 

    YES  - Replace the power seat control unit.

    NO  - Replace the front-up-down motor/position sensor.

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