With Navigation

DTC Troubleshooting: B1779

DTC B1779: HandsFreeLink steering wheel switch failure (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 B1779 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. Turn the ignition switch to ON (II).

7. Measure the voltage between HFL-navigation voice control switch 5P connector terminal No. 2 and body ground.





Is there voltage?

YES -

Repair a short to power in the wire between the HandsFreeLink control unit, the cable reel, and the HFL-navigation voice control switch.

NO -

Go to step 8.

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

9. Check for continuity between HandsFreeLink control unit 32P connector terminal No. 2 and HFL-navigation voice control switch 5P connector terminal No. 2.





Is there continuity?

YES -

Go to step 10.

NO -

Repair an open in the wire between the HFL-navigation voice control switch, the cable reel, and the HandsFreeLink control unit.

10. Reconnect all of the connectors.

11. Measure the voltage between HFL-navigation voice control switch 5P connector terminal No. 4 and body ground.





Is there continuity?

YES -

Substitute a known-good HFL-navigation microphone HFL-Navigation Microphone Removal/Installation, then recheck. If the symptom goes away, replace the original HFL-navigation microphone HFL-Navigation Microphone Removal/Installation. If the symptom does not go away, replace the HandsFreeLink control unit.

NO -

Repair an open or high resistance in the wire between HFL-navigation microphone 5P connector terminal No. 4 and body ground (G501 and G551).