B1779

DTC B1779: HFL Switch or HFL-Voice Control Switch (HFL TALK/HFL BACK Buttons) Circuit Open/Short

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

1. Clear the DTCs with the HDS.
2. Turn the ignition switch OFF, then start the vehicle and turn the steering wheel back and forth several times.
3. Check for DTCs with the HDS.

Is DTC B1779 indicated?

YES - Go to step 4.

NO - Intermittent failure, the system is OK at this time.

4. Turn the ignition switch OFF.
5. Do the HFL-voice control switch test.

Is the switch OK?

YES - Go to step 6.

NO - Replace the HFL-voice control switch.

6. Remove the glove box.
7. Disconnect the 22P connector from the HandsFreeLink control unit.
8. Disconnect the 6P connector from the HFL-voice control switch.
9. Turn the ignition switch ON (II).
10. Check for voltage on the HFL-voice control switch connector terminal 5.

Is there voltage?

YES - Repair a short to power on PUR wire.

NO - Go to step 11.




11. Check for continuity between the HandsFreeLink control unit 22P connector terminal No. 2 and HFL-voice control switch 6P connector terminal No. 5.

Is there continuity?

YES Go to step12.

NO - Repair an open in the RED/BLK wire between the switch, cable reel, and HandsFreeLink control unit.




12. Check for continuity between the HFL-voice control switch 6P connector terminal No. 2 and the 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 HFL-voice control switch. If the connections are OK, substitute a known-good HandsFreeLink control unit. If the problem is gone, replace the original control unit.

NO - Repair an open in the wire between the switch, cable reel, and the audio unit.