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

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) terminals No. 10 and No. 29 and the recline motor/lumbar support motor subharness 8P connector terminals No. 2 and No. 3 respectively.

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) terminal No. 10 and body ground.

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 to ON (II).

16. Measure the voltage between the recline motor/lumbar support motor subharness 8P connector terminals No. 3 (+) and No. 2 (-).

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) terminals No. 15 and No. 29 and the recline motor/lumbar support motor subharness 8P connector terminals No. 2 and No. 8 respectively.

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 terminal No. 8.

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 to ON (II).

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

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) terminals No. 9 and No. 11 and the recline motor/lumbar support motor subharness 8P connector terminals No. 4 and No. 5 respectively.

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 terminals No. 4 and No. 5 individually.

Is there continuity?
YES - Repair short to ground in the wire.

NO - Go to step 31.






31. Test the recline motor. Driver's Power Seat Motor Test

Is the motor OK?
YES - Replace the power seat control unit.

NO - Replace the recline motor/position sensor.