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DTC Troubleshooting: B1779

DTC B1779: HandsFreeLink steering wheel switch failure (without navigation)

NOTE:

- Check the vehicle battery condition first Battery Test.
- Check the connectors for poor connections or loose terminals.
- 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 vehicle and turn the steering wheel back and forth several times.

4. Check for DTCs with the HDS.

Is DTC B1779 indicated?

YES -

The failure is duplicated, 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 HFL switch 5P connector.

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

10. Measure the voltage between HFL 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 switch.

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 HFL switch 5P connector terminal No. 2.





Is there continuity?

YES -

Go to step 13.

NO -

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

13. Reconnect all of the connectors.

14. Measure the voltage between HFL switch 5P connector terminal No. 4 and body ground.





Is there continuity?

YES -

Substitute a known-good HFL microphone HFL Microphone Removal/Installation, then recheck. If the symptom goes away, replace the original HFL microphone HFL 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 microphone 5P connector terminal No. 4 and body ground (G501 and G551).