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DTC B1826: Power Seat Front Up-down Motor Pulse Error

WARNING: This page is about a different car, the 2006 Honda Odyssey and 2005 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • 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 is, even the system is OK, storeAd when the front up-down switch is operated more than one second after the seat moves most up or most down position.
  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 for more than 2 seconds.
  4. Check for DTCs with the HDS.

    Is DTC B1826 indicated? 

    1. YES  - Go to step 5.
    2. NO  - Intermittent failure. The front up-down 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? 

    1. YES  - Go to DTC B1836 troubleshooting (see DTC B1836: POWER SEAT POSITION SENSOR CIRCUIT SHORT  ).
    2. NO  - Go to step 6.
  6. Check for DTCs with the HDS.

    Are DTCs B1825, B1827, and/or B1828 also indicated? 

    1. YES  - Go to step  16.
    2. NO  - Go to step 7.
  7. 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? 

    1. YES  - Go to step 8.
    2. NO  - Go to step  17.
  8. Turn the ignition switch OFF.
  9. Disconnect the power seat control unit connector A (40P).
  10. Disconnect the front up-down motor/position sensor 5P connector.
  11. Check for continuity between the 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) Terminals 12 & 29 And Front Up-Down Motor/Position Sensor 5P Connector Terminals 4 & 5
    G03706914Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Go to step 12.
    2. NO  - Repair an open in the wire.
  12. Check for continuity between the 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) Terminal 12 And Body Ground
    G03706915Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair a short in the wire.
    2. NO  - Go to step 13.
  13. Reconnect the power seat control unit connector A (40P).
  14. Turn the ignition switch ON (II).
  15. Measure voltage between the front up-down motor/position sensor 5P connector No. 3 (+) and No. 4 (-) terminals.
    Fig 3: Measuring Voltage Between Front Up-Down Motor/Position Sensor 5P Connector Terminals 3 And 4
    G03706916Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 10 V? 

    1. YES  - Replace the front up-down motor/position sensor.
    2. NO  - Check for an open in the WHT/BLK wire. If the wire is OK, substitute a known-good power seat control unit. If the problem is repaired, replace the power seat control unit.
  16. Measure voltage between the 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) Terminals 15 And 29
    G03706917Courtesy of AMERICAN HONDA MOTOR CO., INC.

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

    1. YES  - Replace the front up-down motor/position sensor.
    2. NO  - Replace the power seat control unit.
  17. Turn the ignition switch OFF.
  18. Disconnect the power seat control unit connector B (18P).
  19. Disconnect the front up-down motor/position sensor 5P connector.
  20. Check for continuity between the 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) Terminals 6 & 16 And Front Up-Down Motor/Position Sensor Connector Terminals 1 & 2
    G03706918Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Go to step 21.
    2. 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 Terminals 1 & 2 And Body Ground
    G03706919Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair a short in the wire.
    2. NO  - Go to step 22.
  22. Perform the front up-down motor test (see DRIVER'S POWER SEAT MOTOR TEST  ).

    Is the motor OK? 

    1. YES  - Replace the power seat control unit.
    2. NO  - Replace the front-up-down motor/position sensor.
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