B1846

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.

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back to ON (II).
3. Operate the front up-down switch in each direction for more than 2 seconds.
4. 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.

5. Turn the ignition switch to LOCK (0).
6. Disconnect power seat control unit connector A (40P).
7. Disconnect the power seat adjustment switch 12P connector.
8. Check for continuity between power seat control unit connector A (40P) No. 1, No. 4, No. 5 terminals and body ground.






Is there continuity?

YES - Repair short to ground in the wire.

NO - Go to step 9.

9. Check for continuity between the following terminals of power seat control unit connector A (40P).






Is there continuity?

YES - Repair short to ground in the wire.

NO - Go to step 10.

10. Perform the power seat adjustment switch test. Power Seat Adjustment Switch Test/Replacement

Is the switch OK?

YES - Replace the power seat control unit.

NO - Replace the power seat adjustment switch.