DTC Troubleshooting: B1846
DTC B1846:
 Power Seat Front Up-Down Switch Circuit Malfunction
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch to LOCK (0) and then back to ON (II).
  1. Operate the front up-down switch in each direction for more than 1 second.
  1. 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.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect power seat control unit connector A (40P).
  1. Disconnect the power seat adjustment switch 12P connector.
  1. Check for continuity between body ground and power seat control unit connector A (40P) terminals No. 1, No. 4, and No. 5 individually.
Is there continuity?
YES -
Repair a short to ground in the wire.■
NO -
Go to Step 9 .
  1. Check for continuity between these power seat control unit connector A (40P) terminals:
    • No. 1 and No. 4
    • No. 1 and No. 5
    • No. 4 and No. 5
Is there continuity?
YES -
Repair a short in the wire.■
NO -
Go to Step 10 .
Is the switch OK?
YES -
Replace the power seat control unit .■
NO -
Replace the power seat adjustment switch.■