B1779

DTC Troubleshooting: B1779

DTC B1779:

HandsFreeLink steering wheel switch failure

NOTE: Check the vehicle battery condition first Battery Test.

1. Do the HFL Self-Diagnostic Function, and check for HFL DTCs.

Is DTC B1779 indicated?

YES -

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 HFL Switch Removal/Installation.

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 HFL-navigation voice control switch, the cable reel, and the HandsFreeLink control unit.

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. Check for continuity between HFL-navigation voice control switch 5P connector terminal No. 4 and body ground.





Is there continuity?

YES -

Replace the HandsFreeLink control unit Service and Repair.

NO -

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