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 Reading and Clearing Diagnostic Trouble Codes.
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 (With Navigation).
Is the switch OK?
YES -
Go to step 7.
NO -
Replace the voice control switch Service and Repair.�
7. Disconnect the HandsFreeLink control unit 28P connector.
8. Disconnect the voice control switch 5P connector.
9. Check for continuity between HandsFreeLink control unit 28P connector terminal No. 2 and voice control switch 5P connector terminal No. 3.
Is there continuity?
YES -
Go to step 10.
NO -
Repair an open in the wire between the switch, cable reel, and the HandsFreeLink control unit.�
10. Turn the ignition switch to ON (II).
11. Measure the voltage between HandsFreeLink control unit 28P connector terminal No. 2 and body ground.
Is there voltage?
YES -
Repair a short to power in the wire between the HandsFreeLink control unit and the voice control switch.�
NO -
Go to step 12.
12. Turn the ignition switch to LOCK (0).
13. Disconnect audio-navigation unit connector A (24P).
- Eject all the CDs before removing the audio-navigation unit to prevent damaging the CD player's load mechanism.
- Remove the PC card before removing the audio-navigation unit.
14. Check for continuity between audio-navigation unit connector A (24P) terminal No. 5 and voice control switch 5P connector terminal No. 4.
Is there continuity?
YES -
Replace the HandsFreeLink control unit Service and Repair.�
NO -
Repair an open in the wire between the switch, cable reel, and the audio-navigation unit.�