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DTC Troubleshooting: B1779

DTC B1779:

HandsFreeLink steering wheel switch failure (without navigation)

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A Troubleshooting - B-CAN System Diagnosis Test Mode A.

1. Connect the HDS to the DLC.

2. Clear the DTCs with the HDS.

3. Turn the ignition switch to LOCK (0), then start the engine and turn the steering wheel from lock to lock several times.

4. Check for DTCs with the HDS.

Is DTC B1779 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time.�

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

6. Do the HFL switch test HFL Switch Test.

Is the switch OK?

YES -

Go to step 7.

NO -

Replace the HFL switch HFL Switch Replacement.�

7. Disconnect the HandsFreeLink control unit 28P connector.

8. Disconnect the dashboard wire harness 20P connector from the cable reel.

9. Turn the ignition switch to ON (II).

10. Measure the voltage between HandsFreeLink control unit 28P connector terminal No. 2 and body ground.





Is there battery voltage?

YES -

Repair a short to power in the BLU wire.�

NO -

Go to step 11.

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

12. Check for continuity between HandsFreeLink control unit 28P connector terminal No. 2 and dashboard wire harness 20P connector terminal No. 5.





Is there continuity?

YES -

Go to step 13.

NO -

Repair an open in the wire between the cable reel and the HandsFreeLink control unit.�

13. Check for continuity between audio unit connector B (32P) terminal No. 3 and dashboard wire harness 20P connector terminal No. 19.





Is there continuity?

YES -

Check for loose or poor connections at the audio unit, HandsFreeLink control unit, and HFL switch. If the connections are OK, substitute a known-good HandsFreeLink control unit Service and Repair. If the symptom/indication goes away, replace the original HandsFreeLink control unit Service and Repair. If the symptom is still present, replace the cable reel Service and Repair.�

NO -

Repair an open in the wire between the cable reel and the audio unit.�