B1674

DTC Troubleshooting: B1674

DTC B1674: Ignition Switch Control Unit (ROTATE SW) Circuit Short

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0).

3. Insert the built-in key into the ignition switch.

4. Turn the ignition switch to ON (II), and to LOCK (0) ten times using the built-in key.

5. Check for DTCs with the HDS.

Is DTC B1674 indicated?
YES - Go to step 6.

NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections.


6. Turn the ignition switch to LOCK (0).

7. Disconnect keyless access control unit connector A (31P).

8. Disconnect the ignition switch control unit 10P connector.

9. Check for continuity between ignition switch control unit 10P connector terminal No. 8 and body ground.

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

NO - Go to step 10.






10. Check for continuity between ignition switch control unit 10P connector terminals No. 8 and No. 6.

Is there continuity?
YES - Replace the ignition switch control unit.

NO - Replace the keyless access control unit.