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 in all directions for at least 6 seconds each.
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 the 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 17.
NO -
Go to step 7.
7. Turn the ignition switch to LOCK (0) and then back to 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 driver's seat wire harness 8P [14P] connector.
[ ]: With seat ventilation
12. Check for continuity between power seat control unit connector A (40P) terminals No. 10 and No. 29 and driver's seat wire harness 8P [14P] connector terminals No. 2 [No. 3] and No. 3 [No. 4] respectively.
[ ]: With seat ventilation
Without seat ventilation
With seat ventilation
Is there continuity?
YES -
Go to step 13.
NO -
Repair an open in the wire.�
13. 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 14.
14. Reconnect power seat control unit connector A (40P).
15. Turn the ignition switch to ON (II).
16. Measure the voltage between driver's seat wire harness 8P [14P] connector terminals No. 3 [No. 4] (+) and No. 2 [No. 3] (-).
[ ]: With seat ventilation
Without seat ventilation
With seat ventilation
Is there about 5 V?
YES -
Check for an open/short in the wire of the driver's seat 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 a 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 driver's seat wire harness 8P [14P] connector.
[ ]: With seat ventilation
20. Check for continuity between power seat control unit connector A (40P) terminals No. 15 and No. 29 and driver's seat wire harness 8P [14P] connector terminals No. 2 [No. 3] and No. 8 [No. 12] respectively.
[ ]: With seat ventilation
Without seat ventilation
With seat ventilation
Is there continuity?
YES -
Go to step 21.
NO -
Repair an 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 driver's seat wire harness 8P [14P] connector terminal No. 8 [No. 12].
[ ]: With seat ventilation
Without seat ventilation
With seat ventilation
Is there continuity?
YES -
Repair a 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 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 driver's seat wire harness 8P [14P] connector.
29. Check for continuity between power seat control unit connector B (18P) terminals No. 9 and No. 11 and driver's seat wire harness 8P [14P] connector terminals No. 4 [No. 8] and No. 5 [No. 9] respectively.
[ ]: With seat ventilation
Without seat ventilation
With seat ventilation
Is there continuity?
YES -
Go to step 30.
NO -
Repair an open in the wire.�
30. Check for continuity between body ground and driver's seat wire harness 8P [14P] connector terminals No. 4 [No. 8] and No. 5 [No. 9] individually.
[ ]: With seat ventilation
Without seat ventilation
With seat ventilation
Is there continuity?
YES -
Repair a short to ground in the wire.�
NO -
Go to step 31.
31. 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.�