With Navigation

DTC Troubleshooting: B1780

DTC B1780: HandsFreeLink steering wheel switch line short (with navigation)

NOTE:

- Check the vehicle battery condition first Battery Test.
- Check the connectors for poor connections or loose terminals.

1. Check for the HFL DTCs.

Is DTC B1780 indicated?

YES -

The failure is duplicated, go to step 2.

NO -

Intermittent failure, the system is OK at this time.

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

3. Do the HFL switch test HFL Switch Test.

Is the switch OK?

YES -

Go to step 4.

NO -

Replace the HFL-navigation voice control switch Voice Control Switch Replacement (With Navigation).

4. Disconnect the HandsFreeLink control unit 32P connector.

5. Disconnect the HFL-navigation voice control switch 5P connector.

6. Check for continuity between HandsFreeLink control unit 32P connector terminal No. 2 and body ground.





Is there continuity?

YES -

Repair a short to body ground in the wire between the HandsFreeLink control unit and the HFL-navigation voice control switch.

NO -

Replace the HandsFreeLink control unit.