B1826
DTC Troubleshooting: B1826
DTC B1826:
Power Seat Front Up-down Motor Pulse Error
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnostic 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 B1826 is, stored when the front up-down switch is operated more than 1 second after the seat moves to the most up or most down position, even when the system is OK.
4. Check for DTCs with the HDS.
Is DTC B1826 indicated?
YES -
Go to step 5.
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?
YES -
Go to DTC B1836 troubleshooting.�
NO -
Go to step 6.
6. Check for DTCs with the HDS.
Are DTCs B1825, B1827, and/or B1828 also indicated?
YES -
Go to step 16.
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?
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 front up-down motor/position sensor 5P connector.
11. Check for continuity between power seat control unit connector A (40P) terminals No. 12 and No. 29 and front up-down 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. 12 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 connector A (40P).
14. Turn the ignition switch to ON (II).
15. Measure the voltage between front up-down motor/position sensor 5P connector terminals No. 3 (+) and No. 4 (-).
Is there about 10 V?
YES -
Replace the front up-down 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 recline motor/position sensor and the rear up-down motor/position sensor.
21. Check for continuity between front up-down 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 front up-down switch is operated?
YES -
Replace the front up-down 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 front up-down motor/position sensor 5P connector.
27. Check for continuity between power seat control unit connector B (18P) terminals No. 6 and No. 16 and front up-down motor/position sensor 5P connector terminals No. 1 and No. 2 respectively.
Is there continuity?
YES -
Go to step 28.
NO -
Repair an open in the wire.�
28. Check for continuity between front up-down 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 front up-down motor test Driver's Power Seat Motor Test.
Is the motor OK?
YES -
Replace the power seat control unit.�
NO -
Replace the front-up-down motor/position sensor.�