B1673

DTC Troubleshooting: B1673

DTC B1673: Ignition Switch Control Unit (KNOB SW) Circuit Open

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 B1673 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 keyless access control unit connector A (31P) terminal No. 4 and ignition switch control unit 10P connector terminal No. 7.

Is there continuity?
YES - Go to step 10.

NO - Repair open in the wire.






10. Remove the built-in key from the ignition switch.

11. With the ignition knob pushed, check for continuity between ignition switch control unit 10P connector terminals No. 7 and No. 6.

Is there continuity?
YES - Replace the keyless access control unit.

NO - Replace the ignition switch control unit.