With Navigation

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), or press the engine start/stop button to select the OFF mode, 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), or press the engine start/stop button to select the OFF mode.

6. Do the HFL Switch Test HFL Switch Test.

Is the switch OK?

YES -

Go to step 7.

NO -

Replace the audio remote, HFL-navigation voice control switch Overhaul.

7. Disconnect the HandsFreeLink control unit 28P connector.

8. Remove the audio remote, HFL-navigation voice control switch Overhaul and disconnect the 12P connector, then connect the cable reel connector A (20P).

9. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

10. Measure the voltage between audio remote, HFL-navigation voice control switch 12P connector terminal No. 9 and body ground.





Is there voltage?

YES -

Go to step 13.

NO -

Go to step 11.

11. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

12. Check for continuity between HandsFreeLink control unit 28P connector terminal No. 2 and audio remote, HFL-navigation voice control switch 12P connector terminal No. 9.





Is there continuity?

YES -

Go to step 17.

NO -

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

13. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

14. Disconnect cable reel connector A (20P).

15. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

16. 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 cable reel.

NO -

Replace the cable reel Service and Repair.

17. Disconnect audio-navigation unit connector A (24P).

NOTE: Eject all the disc(s) before disconnecting the audio-navigation unit to prevent damaging the CD/DVD player's load mechanism.

18. Check for continuity between audio remote, HFL-navigation voice control switch 12P connector terminal No. 11 and audio-navigation unit connector A (24P) terminal No. 5.





Is there continuity?

YES -

Replace the HandsFreeLink control unit Service and Repair.

NO -

Go to step 19.

19. Substitute a known-good cable reel Service and Repair, and check for continuity between audio remote, HFL-navigation voice control switch 12P connector terminal No. 11 and audio-navigation unit connector A (24P) terminal No. 5.





Is there continuity?

YES -

Replace the original cable reel Service and Repair.

NO -

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