Symptom Troubleshooting

Symptom Troubleshooting: The HFL messages cannot be heard or are weak

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, CDs, 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 - Refer to the audio system symptom troubleshooting.


3. Check the navigation voice recognition system.

Does the voice recognition system work properly?
YES - Go to step 4.

NO - Refer to the navigation system troubleshooting.


4. Check the audio system when HFL messages are played.

Dose the audio system mute when HFL messages are being played?
YES - Go to step 5.

NO - Go to step 10.


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

6. Disconnect navigation unit connector B (24P) and the HandsFreeLink control unit 28P connector.

7. Check for continuity between body ground and the HandsFreeLink control unit 28P connector terminal No. 11 and No. 25 individually.

Is there continuity?
YES - Short to body ground in the wire(s) between the HandsFreeLink control unit and the navigation unit. Replace the affected shielded harness.

NO - Go to step 8.






8. Check for continuity between the terminals of the HandsFreeLink control unit 28P connector according to the table.





Is there continuity between any of the terminals?
YES - Short in the wire(s) between the HandsFreeLink control unit and the navigation unit. Replace the affected shielded harness.

NO - Go to step 9.






9. Check for continuity between the HandsFreeLink control unit 28P connector terminal No. 11 and No. 25 and navigation unit connector B (24P) terminal No. 21 and No. 9.

Is there continuity?
YES - Substitute a known-good HandsFreeLink control unit HandsFreeLink Control Unit Input Test/Replacement (With Navigation), 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.

NO - Open in the wire(s) between the HandsFreeLink control unit and the navigation unit. Replace the affected shielded harness.






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

11. Disconnect navigation unit connector B (24P) and the HandsFreeLink control unit 28P connector.

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

Is there continuity?
YES - Repair short to body ground in the wire between the HandsFreeLink control unit and the navigation unit.

NO - Go to step 13.






13. Check for continuity between the HandsFreeLink control unit 28P connector terminal No. 3 and navigation unit connector B (24P) terminal No. 8.

Is there continuity?
YES - Substitute a known-good HandsFreeLink control unit HandsFreeLink Control Unit Input Test/Replacement (With Navigation), 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 navigation unit.

NO - Repair open in the wire between the HandsFreeLink control unit and the navigation unit.