B1780

DTC Troubleshooting: B1780

DTC B1780:

HandsFreeLink Steering Wheel Switch Line 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. Connect the HDS to the DLC.

2. Clear the HDS to the DLC.

3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode, then start the vehicle and turn the steering wheel back and forth several times.

4. Check for DTCs with the HDS.

Is DTC B1780 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time.

5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

6. Do the HFL Switch Test HFL Switch Test.

Is the switch OK?

YES -

Go to step 7.

NO -

Replace the audio remote, HFL-navigation voice control switch or audio remote-HFL switch Overhaul.

7. Disconnect the HandsFreeLink control unit 28P connector.

8. Disconnect audio remote, HFL-navigation voice control switch or audio remote-HFL switch 12P connector.

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





Is there continuity?

YES -

Repair a short to body ground in the wire.

NO -

Replace the HandsFreeLink control unit Service and Repair.