B1780

DTC Troubleshooting: B1780

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

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. 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 cable reel subharness. Steering Wheel Removal


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

7. Remove the glove box. Service and Repair

8. Disconnect the 28P connector from the HandsFreeLink control unit.

9. Disconnect the 20P connector from the cable reel subharness.

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

Is there continuity?
YES - Repair short in the wire.

NO - Replace the HandsFreeLink control unit.