B1828

DTC Troubleshooting: B1828

DTC B1828:

Power Seat Recline Motor Pulse Error

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A.

1. Turn the ignition switch to LOCK (0), and then back to ON (II).

2. Clear the DTCs with the HDS.

3. Operate the power seat adjustment switch for several seconds in each direction.

NOTE: 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.

4. Check for 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 -

Go to DTC B1836 troubleshooting B1836.�

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 16.

NO -

Go to step 7.

7. Operate the recline switch for 2 seconds, and check the recline motor operation.

Does the recline motor run smoothly?

YES -

Go to step 8.

NO -

Go to step 24.

8. Turn the ignition switch to LOCK (0).

9. Disconnect power seat control unit connector A (40P).

10. Disconnect the recline motor/position sensor 5P connector.

11. Check for continuity between power seat control unit connector A (40P) terminals No. 10 and No. 29 and recline motor/position sensor 5P connector terminals No. 5 and No. 4 respectively.





Is there continuity?

YES -

Go to step 12.

NO -

Repair an open in the wire.�

12. Check for continuity between power seat control unit connector A (40P) terminal No. 10 and body ground.





Is there continuity?

YES -

Repair a short to ground in the wire.�

NO -

Go to step 13.

13. Reconnect power seat control unit A (40P).

14. Turn the ignition switch to ON (II).

15. Measure the voltage between recline motor/position sensor 5P connector terminals No. 3 (+) and No. 4 (-).





Is there about 10 V?

YES -

Replace the recline motor/position sensor.�

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. Turn the ignition switch to LOCK (0).

17. Disconnect power seat control unit connector A (40P).

18. Disconnect the slide position sensor 3P connector.

19. Check for continuity between power seat control unit connector A (40P) terminals No. 15 and No. 29 and slide position sensor 3P connector terminals No. 3 and No. 2 respectively.





Is there continuity?

YES -

Go to step 20.

NO -

Repair an open in the wire.�

20. Disconnect each 5P connector from the front up-down motor/position sensor and the rear up-down motor/position sensor.

21. Check for continuity between recline motor/position sensor 5P connector terminal No. 3 and body ground.





Is there continuity?

YES -

Repair a short to ground in the wire.�

NO -

Go to step 22.

22. Reconnect power seat control unit connector A (40P).

23. Measure the voltage between power seat control unit connector A (40P) terminals No. 15 and No. 29.





Is there about 10 V when the recline switch is operated?

YES -

Replace the recline motor/position sensor.�

NO -

Replace the power seat control unit.�

24. Turn the ignition switch to LOCK (0).

25. Disconnect power seat control unit connector B (18P).

26. Disconnect the recline motor/position sensor 5P connector.

27. Check for continuity between power seat control unit connector B (18P) terminals No. 9 and No. 11 and recline motor/position sensor 5P connector terminals No. 2 and No. 1 respectively.





Is there continuity?

YES -

Go to step 28.

NO -

Repair an open in the wire.�

28. Check for continuity between recline motor/position sensor 5P connector terminals No. 1 and No. 2 and body ground individually.





Is there continuity?

YES -

Repair a short to ground in the wire.�

NO -

Go to step 29.

29. Do the recline motor test Driver's Power Seat Motor Test.

Is the motor OK?

YES -

Replace the power seat control unit.�

NO -

Replace the recline motor/position sensor.�