B1780

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

1. Connect the HDS to the DLC.
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.

7. Remove the passenger's console trim.
8. Disconnect the 22P connector from the HandsFreeLink control unit.
9. Check for continuity between HandsFreeLink control unit 22P connector No. 2 terminal and body ground.






Is there continuity?

YES - Repair short in the wire between the HandsFreeLink control unit and the HFL switch.

NO - Go to step 10.

10. Reconnect the HandsFreeLink control unit 22P connector.
11. Turn the ignition switch to ON (II).
12. Measure the voltage between HandsFreeLink control unit 22P connector No. 2 terminal and body ground.






Is there voltage?

YES - Replace the HandsFreeLink 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 HandsFreeLink control unit. If the wire is OK, replace the HandsFreeLink control unit.