DTC B1828: Power Seat Recline Motor Pulse Error

DTC B1828 is stored when the recline switch is operated more than 1 second after the seat back reclines to the most forward or most backward position, even when the system is OK.

1. Turn the ignition switch to LOCK (0), 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 1 second each.
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 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 A (40P).
11. Disconnect the recline motor/lumbar support motor subharness 8P connector.
12. Check for continuity between the power seat control unit connector A (40P) No. 10 and No. 29 terminals and the recline motor/lumbar support motor subharness 8P connector No. 2 and No. 3 terminals respectively.
    Fig 1: Identifying Continuity Between No. 10 And No. 29 Terminals And No. 2 And No. 3 Terminals

    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step 13.

    NO  - Repair open in the wire.

13. Check for continuity between the power seat control unit connector A (40P) No. 10 terminal and body ground.
    Fig 2: Identifying Continuity Between Power Seat Control Unit Connector A (40P) No. 10 Terminal And Body Ground

    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair short to ground in the wire.

    NO  - Go to step 14.

14. Reconnect power seat control unit connector A (40P).
15. Turn the ignition switch ON (II).
16. Measure the voltage between the recline motor/ lumbar support motor subharness 8P connector No. 3 (+) and No. 2 (-) terminals.
    Fig 3: Identifying Voltage Between Recline Motor/ Lumbar Support Motor Subharness 8P Connector No. 3 And No. 2 Terminals

    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V? 

    YES  - Check for an open/short in the wire of the recline motor/lumbar support motor subharness. If the harness is OK, replace the recline motor/ position sensor.

    NO  - If there is no voltage, replace the power seat control unit. If there is battery voltage, repair short in the wire (sensor line).

17. Turn the ignition switch to LOCK (0).
18. Disconnect power seat control unit connector A (40P).
19. Disconnect the recline motor/lumbar support motor subharness 8P connector.
20. Check for continuity between the power seat control unit connector A (40P) No. 15 and No. 29 terminals and the recline motor/lumbar support motor subharness 8P connector No. 2 and No. 8 terminals respectively.
    Fig 4: Identifying Continuity Between No. 15 And No. 29 Terminals And No. 2 And No. 8 Terminals

    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step 21.

    NO  - Repair open in the wire.

21. Disconnect the 4P connector from the slide position sensor, the front up-down position sensor, and the rear up-down position sensor.
22. Check for continuity between body ground and the recline motor/lumbar support subharness 8P connector No. 8 terminal.
    Fig 5: Identifying Continuity Between Body Ground And Recline Motor/Lumbar Support Subharness 8P Connector No. 8 Terminal

    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair short to ground in the wire.

    NO  - Go to step 23.

23. Reconnect power seat control unit connector A (40P).
24. Turn the ignition switch ON (II).
25. Measure the voltage between the power seat control unit connector A (40P) No. 15 and No. 29 terminals.
    Fig 6: Identifying Voltage Between Power Seat Control Unit Connector A (40P) No. 15 And No. 29 Terminals

    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage when the recline switch is operated? 

    YES  - Replace the recline motor/position sensor.

    NO  - Replace the power seat control unit.

26. Turn the ignition switch to LOCK (0).
27. Disconnect power seat control unit connector B (18P).
28. Disconnect the recline motor/lumbar support motor subharness 8P connector.
29. Check for continuity between the power seat control unit connector B (18P) No. 9 and No. 11 terminals and the recline motor/lumbar support motor subharness 8P connector No. 4 and No. 5 terminals respectively.
    Fig 7: Identifying Continuity Between No. 9 And No. 11 Terminals And No. 4 And No. 5 Terminals

    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step 30.

    NO  - Repair open in the wire.

30. Check for continuity between body ground and the recline motor/lumbar support motor subharness 8P connector No. 4 and No. 5 terminals individually.
    Fig 8: Identifying Continuity Between Body Ground And Recline Motor/Lumbar Support Motor Subharness 8P Connector No. 4 And No. 5 Terminals

    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair short to ground in the wire.

    NO  - Go to step 31.

31. Test the recline motor (see SLIDE MOTOR, FRONT UP-DOWN MOTOR, REAR UP-DOWN MOTOR  ).

    Is the motor OK? 

    YES  - Replace the power seat control unit.

    NO  - Replace the recline motor/position sensor.