DTC B1846: Power Seat Front Up-Down Switch Circuit Malfunction
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 2 seconds.
- Check for DTCs with the HDS.
Is DTC B1846 indicated?
YES - Go to step 5.
NO - Intermittent failure. The driving position memory system is OK at this time. Check for loose or poor connections at the power seat control unit connector.
- Turn the ignition switch to LOCK (0).
- Disconnect power seat control unit connector A (40P).
- Disconnect the power seat adjustment switch 12P connector.
- Check for continuity between power seat control unit connector A (40P) No. 1, No. 4, No. 5 terminals and body ground.Fig 1: Identifying Continuity Between Power Seat Control Unit Connector A (40P) No. 1, No. 4, No. 5 Terminals And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES - Repair short to ground in the wire.
NO - Go to step 9.
- Check for continuity between the following terminals of power seat control unit connector A (40P).CONTINUITY CHART
No. 1 ↔ No. 4 terminals No. 1 ↔ No. 5 terminals No. 4 ↔ No. 5 terminals Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES - Repair short to ground in the wire.
NO - Go to step 10.
- Perform the power seat adjustment switch test (see
POWER SEAT ADJUSTMENT SWITCH TEST/REPLACEMENT ).
Is the switch OK?
YES - Replace the power seat control unit.
NO - Replace the power seat adjustment switch.