B1779
DTC Troubleshooting: B1779
DTC B1779:
HandsFreeLink steering wheel switch failure
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 vehicle and turn the steering wheel back and forth 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/Replacement.
Is the switch OK?
YES -
Go to step 7.
NO -
Replace the HFL switch HFL Switch Test/Replacement.�
7. Remove the glove box Glove Box Removal / Installation.
8. Disconnect the HandsFreeLink control unit 28P connector.
9. Disconnect the HFL switch 6P connector.
10. Turn the ignition switch to ON (II).
11. Measure the voltage between HFL switch connector terminal No. 5 and body ground.
Is there voltage?
YES -
Repair short to power on the PUR wire.
NO -
Go to step 12.
12. Turn the ignition switch to LOCK (0).
13. Check for continuity between HandsFreeLink control unit 28P connector terminal No. 2 and HFL switch 6P connector terminal No. 5.
Is there continuity?
YES -
Go to step 14.
NO -
Repair open in the RED/BLK wire between the HFL switch, cable reel, and the HandsFreeLink control unit.�
14. Check for continuity between HFL switch 6P connector terminal No. 2 and audio unit connector A (20P) terminal No. 11.
Is there continuity?
YES -
Check for loose or poor connections at the audio unit, HandsFreeLink control unit, and the HFL switch. If the connections are OK, substitute a known-good HandsFreeLink control unit Service and Repair. If the problem is gone, replace the original HandsFreeLink control unit Service and Repair.�
NO -
Repair open in the wire between the HFL switch, the cable reel, and the audio unit.�