B1780

DTC Troubleshooting: B1780

DTC B1780: HFL Switch (HFL TALK/HFL BACK Buttons) Circuit Short

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0), then start the vehicle, and turn the steering wheel back and forth several times.

3. Check for DTCs with the HDS.

Is DTC B1780 indicated?
YES - Go to step 4.

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


4. Turn the ignition switch to LOCK (0).

5. Do the HFL switch test. HFL Switch Test (With Navigation)

Is the switch OK?
YES - Go to step 6.

NO - Replace the HFL-voice control switch. Service and Repair


6. Disconnect the HandsFreeLink control unit 28P connector.

7. Disconnect the HFL-voice control switch 5P connector.

8. Check for continuity between HandsFreeLink control unit 28P connector terminal No. 2 and body ground.

Is there continuity?
YES - Repair short in the wire between the HandsFreeLink control unit and the HFL-voice control switch.

NO - Replace the HandsFreeLink control unit. HandsFreeLink Control Unit Input Test/Replacement (With Navigation)