B1672

DTC Troubleshooting: B1672

DTC B1672: Ignition Switch Control Unit (KNOB 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 key 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 B1672 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. 7 and body ground.

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

NO - Go to step 10.






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

11. Check for continuity between ignition switch control unit 10P connector terminals No. 7 and No. 6.

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

NO - Replace the keyless access control unit.