Symptom Troubleshooting

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

The HFL messages cannot be heard or are weak

NOTE: Check the vehicle battery condition first Battery Test.

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 4.

NO -

Refer to the audio system Symptom Troubleshooting.

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

4. Connect the HDS to the DLC.

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

6. Check for HFL DTCs with the HDS.

Are there any DTCs indicated?

YES -

Troubleshoot the indicated DTC(s).

NO -

Go to step 7.

7. Press the HFL TALK button, and check if the HFL messages are played.

Are the HFL messages played?

YES -

Go to step 8.

NO -

Go to step 10.

8. Turn on the audio system.

9. Press the HFL TALK button, and check the audio system when HFL messages are played.

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

YES -

Operation is normal.

NO -

Go to step 15.

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

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

12. Check for continuity between HandsFreeLink control unit 28P connector terminals No. 11 and No. 25 and audio unit connector B (20P) terminals No. 19 and No. 9 respectively.





Is there continuity?

YES -

Go to step 13.

NO -

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

13. Check for continuity between body ground and audio unit connector B (20P) terminals No. 9 and No. 19 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 14.

14. Check for continuity between the terminals of audio unit connector B (20P) according to the table.









Is there continuity between any of the terminals?

YES -

There is a short in the wires 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/indication goes away, replace the original HandsFreeLink control unit Service and Repair. If the symptom/indication is still present, replace the audio unit; with navigation Audio Unit Removal/Installation (With Navigation), without navigation Audio Unit Removal/Installation (Without Navigation).

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

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

17. Check for continuity between HandsFreeLink control unit 28P connector terminal No. 3 and audio unit connector B (20P) terminal No. 20.





Is there continuity?

YES -

Go to step 18.

NO -

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

18. Disconnect the front HFL-navigation-ANC microphone 7P connector or the front HFL-ANC microphone 7P connector.

19. 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/indication goes away, replace the original HandsFreeLink control unit Service and Repair. If the symptom/indication is still present, replace the audio unit; with navigation Audio Unit Removal/Installation (With Navigation), without navigation Audio Unit Removal/Installation (Without Navigation).