The HFL Message Cannot Be Heard or Are Weak

HandsFreeLink System Symptom Troubleshooting - The HFL message cannot be heard or are weak

The HFL messages cannot be heard or are weak

1. Turn the ignition switch to ON (II).

2. Check that the audio system is operating normally and the speaker sound levels from different audio sources (AM, FM, XM, CD, Navigation, etc.).

Does the audio system work normally and is the audio output from the speaker normal when playing various audio sources?

YES -

Go to step 3.

NO -

Go to no sound is heard from the speaker(s) (display is normal):�

- With ELS audio system No Sound is Heard From the Speaker(s) (Display is Normal)

- With premium audio system No Sound is Heard From the Speaker(s) (Display is Normal)

3. Connect the HDS to the DLC Initial Inspection and Diagnostic Overview.

4. Clear the DTCs with the HDS.

5. Turn the ignition switch to LOCK (0) and then back to ON (II).

Are there any DTCs indicated?

YES -

Repair the indicated DTCs.�

NO -

Go to step 6.

6. Press the HFL TALK button.

Does the audio system mute when HFL messages are being played?

YES -

Go to step 7.

NO -

Go to step 12.

7. Turn the ignition switch to LOCK (0).

8. Disconnect the audio unit connector B (20P) and the HandsFreeLink control unit 28P connector.

9. Check for continuity between HandsFreeLink control unit 28P connector terminals No. 11 and No. 25 and audio unit connector C (28P) terminals No. 27and No. 13 respectively.





Is there continuity?

YES -

Go to step 10.

NO -

There is an open in the wire(s) between the HandsFreeLink control unit and the audio unit. Replace the affected shielded harness.�

10. Check for continuity between body ground and audio unit connector C (28P) terminals No. 13 and No. 27 individually.





Is there continuity?

YES -

There is a short to body ground in the wire(s) between the HandsFreeLink control unit and the audio unit. Replace the affected shielded harness.�

NO -

Go to step 11.

11. Check for continuity between the terminals of audio unit connector C (28P) according to the table.









Is there continuity?

YES -

There is a short in the wire(s) between the HandsFreeLink control unit and the audio unit. Replace the affected shielded harness.�

NO -

Substitute a known-good HandsFreeLink control unit Service and Repair, and recheck. If the symptom goes away, replace the original HandsFreeLink control unit. If the symptom does not go away, replace the audio unit, with ELS audio system Audio Unit Removal/Installation (With Navigation System), with premium audio system Audio Unit Removal/Installation (Without Navigation System).�

12. Press the HFL TALK button.

Does the audio-HVAC subdisplay unit or audio-HVAC display unit the HFL menu and the subdisplay show HandsFreeLink when pressing the HFL TALK button?

YES -

Go to step 13.

NO -

Go to step 17.

13. Turn the ignition switch to LOCK (0).

14. Disconnect the HandsFreeLink control unit 28P connector and the audio unit connector C (28P).

15. Check for continuity between HandsFreeLink control unit 28P connector terminal No. 3 and audio unit connector C (28P) terminal No. 28.





Is there continuity?

YES -

Go to step 16.

NO -

Repair an open in the wire between the HandsFreeLink control unit and the audio unit.�

16. Check for continuity between HandsFreeLink control unit 28P connector terminal No. 3 and body ground.





Is there continuity?

YES -

Repair a short to body ground in the wire between the HandsFreeLink control unit and the audio unit.�

NO -

Substitute a known-good HandsFreeLink control unit Service and Repair, and recheck. If the symptom goes away, replace the original HandsFreeLink control unit. If the symptom does not go away, replace the audio unit, with ELS audio system Audio Unit Removal/Installation (With Navigation System), with premium audio system Audio Unit Removal/Installation (Without Navigation System).�

17. Turn the ignition switch to LOCK (0).

18. Disconnect the HandsFreeLink control unit 28P connector and the HFL switch 7P connector.

19. Check for continuity between HandsFreeLink control unit 28P connector terminal No. 2 and HFL switch 7P connector terminal No.4.





Is there continuity?

YES -

Refer to the HFL switch test HFL Switch Test.

NO -

Repair an open in the wire between the HandsFreeLink control unit and the HFL switch.�