B1779
DTC B1779: HFL Switch (HFL TALK/HFL BACK Buttons) Circuit Open/Short to Power1. 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.
Is the switch OK?
YES - Go to step 7.
NO - Replace the HFL switch.
7. Remove the passenger's console trim.
8. Disconnect the 22P connector from the HandsFreeLink control unit.
9. Disconnect the 6P connector from the HFL-voice control switch.
10. Check for continuity between the HandsFreeLink control unit 22P connector No. 2 terminal and HFL switch 7P connector No. 4 terminal.
Is there continuity?
YES - Go to step 11.
NO - Repair open in the BLU wire between the switch, cable reel, and HandsFreeLink control unit.
11. Turn the ignition switch to ON (II).
12. Measure the voltage between HandsFreeLink control unit 22P connector No. 2 terminal and body ground.
Is there voltage?
YES - Repair short to body ground in the wire between the HandsFreeLink control unit and the HFL switch.
NO - Go to step 13.
13. Turn the ignition switch to LOCK (0).
14. Check for continuity between HFL switch 7P connector terminal No. 5 and body ground.
Is there continuity?
YES - Replace the HandsFreeLink control unit
NO - Repair open in the wire between the switch, cable reel, and the audio units.