DTC B1846: Power Seat Front Up-Down Switch Circuit Malfunction
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2017 Honda Odyssey, 2016 Honda Odyssey, 2015 Honda Odyssey, 2014 Honda Odyssey, and 2013 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
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
).
- Clear the DTCs with the HDS.
- Turn the ignition switch to LOCK (0), and then back to ON (II).
- Operate the front up-down switch in each direction for more than 1 second.
- Check for DTCs with the HDS.
Is DTC B1846 indicated?
YES -Go to step 5.
NO -Intermittent failure, the system is OK at this time. Check for loose or poor connections.
- Turn the ignition switch to LOCK (0).
- Disconnect power seat control unit connector B (40P).
- Disconnect the power seat adjustment switch 12P connector.
- Check for continuity between body ground and power seat control unit connector B (40P) terminals No. 16, No. 17, and No. 20 individually.Fig 1: Checking Continuity Between Body Ground And Power Seat Control Unit Connector B (40P) Terminals No. 16, No. 17, And No. 20
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Repair a short to ground in the wire.
NO -Go to step 9.
- Check for continuity between these power seat control unit connector B (40P) terminals:
- No. 16 and No. 17
- No. 16 and No. 20
- No. 17 and No. 20
Is there continuity?
YES -Repair a short in the wire(s).
NO -Go to step 10.
- Test the power seat adjustment switch (see POWER SEAT ADJUSTMENT SWITCH TEST/REPLACEMENT
).
Is the switch OK?
YES -Replace the power seat control unit (see POWER SEAT CONTROL UNIT INPUT TEST/REPLACEMENT ).
NO -Replace the power seat adjustment switch (see POWER SEAT ADJUSTMENT SWITCH TEST/REPLACEMENT ).