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. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0), then start the engine, and turn the steering wheel from lock to lock 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.

Is the switch OK?

YES -

Go to step 6.

NO -

Replace the HFL-voice control switch Overhaul.�

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 -

Go to step 9.

NO -

Replace the HandsFreeLink control unit Service and Repair.�

9. Disconnect the dashboard wire harness 20P connector from the cable reel.

10. 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 WHT wire between the HandsFreeLink control unit and the cable reel.�

NO -

Replace the cable reel Service and Repair.�