B1779

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

NOTE:
- If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A.
- Information marked with an asterisk (*) applies to the switch with navigation system.

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 switch or HFL-voice control switch* test.

Is the switch OK?

YES - Go to step 6.

NO - Replace the HFL switch or HFL-voice control switch*.

6. Remove the HandsFreeLink control unit.
7. Disconnect the 22P connector from the HandsFreeLink control unit.
8. Disconnect the 5P connector from the HFL switch or HFL-voice control switch*.
9. Turn the ignition switch ON (II).
10. Measure the voltage on HFL switch connector terminal No. 3 and body ground.

Is there voltage?

YES - Repair short to power in the PUR wire.

NO - Go to step 11.




11. Check for continuity between the HandsFreeLink control unit 22P connector terminal No. 2 and HFL switch or HFL-voice control switch" 5P connector terminal No. 3.

Is there continuity?

YES - Go to step 12.

NO - Repair open in the PUR wire between the switch, cable reel and HandsFreeLink control unit.




12. Check for continuity between the HFL or HFL-voice control switch 5P connector No. 2 terminal and the audio unit connector A (20P) No. 11 terminal.

Is there continuity?

YES - Check for loose or poor connections at the audio unit, HandsFreeLink control unit and HFL switch or HFL-voice control switch. If the connections are OK, substitute a known-good HandsFreeLink control unit. If the problem is gone, replace the original HandsFreeLink control unit.

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