The HFL Messages Cannot Be Heard Or Are Weak (With Navigation)

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.
* Check the connectors for poor connections or loose terminals.

1. Determine possible failure area (audio system, HFL system):

Determine possible failure area (audio system, HFL system)
-1. Turn the ignition switch to ON (II).

-2. Check that the audio system is operating normally, from different audio sources (AM/FM and CD) and the speaker sound levels are normal.

Does the audio system work normally, and is the audio output from the speaker normal when playing various audio sources?
-YES- Go to step 2.
-NO- Refer to the audio system Symptom Troubleshooting.

2. Problem verification:

Problem verification
-1. Do the HFL Self-Diagnostic Function HandsFreeLink System Self-Diagnostic Function.

Do you hear, "The HFT is OK"?
-YES- Intermittent failure, the system is OK at this time.
-NO- The failure is duplicated, go to step 3.

3. DTC check:

DTC check
-1. Check for HFL DTCs How To Troubleshoot The HandsFreeLink System.

Are there any HFL DTCs indicated?
-YES- Go to indicated DTC's troubleshooting.
-NO- Go to step 4.

4. Determine possible failure area (HFL switch, others):

Determine possible failure area (HFL switch, others)
-1. Turn the ignition switch to LOCK (0).

-2. Do the HFL Switch Test Service and Repair.

Is the switch OK?
-YES- Go to step 5.
-NO- Replace the HFL switch Service and Repair.

5. Shorted wire check (TELEM_SIG+ line, TELEM_SIG- line):

Shorted wire check (TELEM_SIG+ line, TELEM_SIG- line)
-1. Disconnect the following connectors.





-2. Check for continuity between test points 1 and 2.














Is there continuity?
-YES- There is a short to body ground in the wire(s) between the HandsFreeLink control unit and the audio-navigation unit. Replace the affected shielded harness.
-NO- Go to step 6.

6. Shorted wire check (SH_TELEM_SIG line to another lines):

Shorted wire check (SH_TELEM_SIG line to another lines)
-1. Check for continuity between test points 1 and 2.














Is there continuity?
-YES- There is a short in the wires between the HandsFreeLink control unit and the audio-navigation unit. Replace the affected shielded harness.
-NO- Go to step 7.

7. Open wire check (TELEM_SIG+ line, TELEM_SIG- line):

Open wire check (TELEM_SIG+ line, TELEM_SIG- line)
-1. Check for continuity between test points 1 and 2.














Is there continuity?
-YES- Go to step 8.
-NO- There is an open in the wire(s) between the HandsFreeLink control unit and the audio-navigation unit. Replace the affected shielded harness.

8. Audio-navigation unit check:

Audio-navigation unit check
-1. Substitute a known-good HandsFreeLink control unit Service and Repair, and recheck.

Does the symptom go away?
-YES- Replace the original HandsFreeLink control unit.
-NO- Replace the audio-navigation unit Audio-Navigation Unit Removal and Installation.