B1780

DTC B1780: HFL Switch or HFL-Voice Control Switch* (HFLTALK/HFL BACK Buttons) Short

NOTE:
- Information marked with an asterisk (*) applies to the switch with navigation system.
- If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A.

1. Turn the ignition switch to ON (II).
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 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).
6. Do the HFL switch test.

Is the switch OK?

YES - Go to step 7.

NO - Replace the HFL switch or HFL/voice control switch*.

7. Remove the roof console.
8. Disconnect HandsFreeLink control unit 28P connector.
9. Disconnect the 20P connector from the cable reel.
10. Check for continuity between the HandsFreeLink control unit 28P connector terminal No. 2 and body ground.






Is there continuity?

YES - Repair short to body ground in the wire between the HandsFreeLink control unit and HFL switch or HFL/voice control switch*.

NO - Check for loose or poor connections at the audio unit, HandsFreeLink control unit, and HFL switch or HFL/voice control switch*. If the connections are OK, substitute a known-good HandsFreeLink control unit. If the problem is gone, replace the original HandsFreeLink control unit.