B1671

DTC Troubleshooting: B1671

DTC B1671: Ignition Switch Control Unit (KEY 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 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 B1671 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. 13 and ignition switch control unit 10P connector terminal No. 3.

Is there continuity?
YES - Go to step 10.

NO - Repair open in the wire.






10. With the built-in key inserted, check for continuity between ignition switch control unit 10P connector terminals No. 3 and No. 6.

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

NO - Replace the ignition switch control unit.