DTC B1826: Power Seat Front Up-down Motor Pulse Error Honda Pilot II

Note. If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

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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 more than 1 second each. NOTE: DTC B1826 can be stored if the front up-down switch is held on for more than 1 second after the seat reaches the end of its travel, even when the system is OK.
4. Check for the DTCs with the HDS. Is DTC B1826 indicated? YES - Go to step 5 . NO - Intermittent failure, the front up-down motor/position sensor is OK at this time. Check for loose or poor connections at the power seat control unit connectors.
5. Check for DTCs with the HDS. Is DTC B1836 also indicated? YES - Go to the 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 17 . NO - Go to step 7 .
7. Turn the ignition switch to LOCK (0), and then back to ON (II).
8. 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 9 . NO - Go to step 26 .
9. Turn the ignition switch to LOCK (0).
10. Disconnect power seat control unit connector B (40P).
11. Disconnect the front up-down motor/position sensor 6P connector.
12. Check for continuity between power seat control unit connector B (40P) terminals No. 12 and No. 29 and front up-down motor/position sensor 6P connector terminals No. 1 and No. 3 respectively. Is there continuity? YES - Go to step 13 . NO - Repair an open or high resistance in the wire.
13. Check for continuity between power seat control unit connector B (40P) terminal No. 12 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 B (40P).
15. Turn the ignition switch to ON (II).
16. Measure the voltage between front up-down motor/position sensor 6P connector terminals No. 1 (+) and No. 3 (-). Is there about 5 V? YES - Faulty front up-down motor/position sensor, replace the seat frame assembly (see «FRONT SEAT FRAME REPLACEMENT»(ref-333588-S05177044082009072100000) ).. • NO - If there is no voltage, replace the power seat control unit (see «Power Seat Control Unit Input Test/Replacement»(ref-333636-S23430400662009072100000) ). 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 B (40P).
19. Disconnect the front up-down motor/position sensor 6P connector.
20. Check for continuity between power seat control unit connector B (40P) terminals No. 15 and No. 29 and front up-down motor/position sensor 6P connector terminals No. 4 and No. 3 respectively. Is there continuity? YES - Go to step 21 . NO - Repair an open or high resistance in the wire.
21. Disconnect the 6P connector from the slide motor/position sensor and the rear up-down motor/position sensor, then disconnect the recline motor/position sensor 8P connector.
22. Check for continuity between body ground and front up-down motor/position sensor 6P connector terminal No. 4. Is there continuity? YES - Repair a short to ground in the wire. • NO - Go to step 23 .
23. Reconnect power seat control unit connector B (40P).
24. Turn the ignition switch to ON (II).
25. Measure the voltage between power seat control unit connector B (40P) terminals No. 15 and No. 29. Is there battery voltage when the front up-down switch is operated? YES -Faulty front up-down motor/position sensor, replace the seat frame assembly (see «FRONT SEAT FRAME REPLACEMENT»(ref-333588-S05177044082009072100000) ).. • NO -Replace the power seat control unit «Power Seat Control Unit Input Test/Replacement»(ref-333636-S23430400662009072100000) .
26. Check the No. 10 (20A) fuse in the auxiliary under-hood fuse box. Is fuse OK? YES - Go to step 27. NO - Replace the fuse and recheck for proper operation.
27. Measure the voltage to body ground at power seat control unit connector A (18P) terminals No. 4 and No. 18 when operating the front up-down switch. Is there 0.2 V or more? YES - Repair an open or high resistance in the wire between the power seat control unit and G503. NO - Go to step 28.
28. Turn the ignition switch to LOCK (0).
29. Disconnect power seat control unit connector A (18P).
30. Disconnect the front up-down motor/position sensor 6P connector.
31. Check for continuity between power seat control unit connector A (18P) terminals No. 6 and No. 16 and front up-down motor/position sensor 6P connector terminals No. 5 and No. 6 respectively. Is there continuity? YES - Go to step 32 NO - Repair an open or high resistance in the wire.
32. Check for continuity between body ground and front up-down motor/position sensor 6P connector terminals No. 5 and No. 6 individually. Is there continuity? YES - Repair a short to ground in the wire. • NO - Go to step 33.
33. Test the front up-down motor (see «DRIVER'S POWER SEAT MOTOR TEST»(ref-333636-S40270430552009072100000) ) Is the motor OK? YES - Replace the power seat control unit. • NO - Replace the front up-down motor/position sensor.