B1846

DTC Troubleshooting: 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. Troubleshooting - 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), or press the engine start/stop button to select the OFF mode and then the ON mode.

3. Operate the front up-down switch in each direction for more than 1 second.

4. 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.


5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

6. Disconnect power seat control unit connector B (40P).

7. Disconnect the power seat adjustment switch 12P connector.

8. Check for continuity between body ground and power seat control unit connector B (40P) terminals No. 1, No. 4, and No. 5 individually.

Is there continuity?
YES - Repair short to ground in the wire.

NO - Go to step 9.






9. Check for continuity between these power seat control unit connector B (40P) terminals:
- No. 1 and No. 4

- No. 1 and No. 5

- No. 4 and No. 5

Is there continuity?
YES - Repair short in the wire.

NO - Go to step 10.






10. Test the power seat adjustment switch . Driver's Power Seat Adjustment Switch Test/Replacement

Is the switch OK?
YES - Replace the power seat control unit. Testing and Inspection

NO - Replace the power seat adjustment switch. Driver's Power Seat Adjustment Switch Test/Replacement