B1780

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

1. Connect the HDS to the DLC.
2. Clear the DTCs with the HDS.
3. Turn the ignition switch OFF, 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 OFF.
6. Do the HFL-voice control switch test.

Is the switch OK?

YES - Go to step 7.

NO - Replace the HFL-voice control switch.

7. Remove the passenger's console trim.
8. Disconnect the 22P connector from the Hands Free Link control unit.




9. Check for continuity between Hands Free Link control unit 22P connector terminal No. 2 and body ground.

Is there continuity?

YES - Repair short in the wire between the Hands Free Link control unit and the HFL-voice control switch.

NO - Go to step 10.

10. Reconnect the Hands Free Link control unit 22P connector.
11. Turn the ignition switch ON (II).




12. Measure the voltage between Hands Free Link control unit 22P connector terminal No. 2 and body ground.

Is there voltage?

YES - Replace the Hands Free Link control unit.

NO - Check the No. 35 (7.5 A) fuse in the under-dash fuse/relay box. If the fuse is OK, check for an open in the wire between the under-dash fuse/relay box and the Hands Free Link control unit. If the wire is OK, replace the Hands Free Link control unit.