HFL Messages Cannot Be Heard or Are Weak
Symptom Troubleshooting: The HFL messages 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 - Refer to the audio system symptom troubleshooting.
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).
6. Check for DTCs.
Are there any DTCs indicated?
YES - Repair the indicated DTCs.
NO - Go to step 7.
7. Press the HFL TALK button.
Does the audio system mute when HFL messages are being played?
YES - Go to step 8.
NO - Go to step 13.
8. Turn the ignition switch to LOCK (0).
9. Disconnect audio unit connector B (20P) and the HandsFreeLink control unit 28P connector.
10. 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 11.
NO - There is an open in the wire(s) between the HandsFreeLink control unit and the audio unit. Replace the affected shielded harness.
11. 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 12.
12. Check for continuity between the terminals of audio unit connector B (20P) 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 AcuraLink) with premium audio system. Audio Unit Removal/Installation (With Premium Audio System)
13. Press the HFL talk button.
Does the audio-HVAC subdisplay (audio-navigation switch panel), audio-HVAC display unit, the HFL menu and the subdisplay show HandsFreeLink when pressing the HFL TALK button?
YES - Go to step 14.
NO - Go to step 18.
14. Turn the ignition switch to LOCK (0).
15. Disconnect the HandsFreeLink control unit 28P connector and audio unit connector B (20P).
16. 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 17.
NO - Repair an open in the wire between the HandsFreeLink control unit and the audio unit.
17. Check for continuity between body ground and HandsFreeLink control unit 28P connector terminal No. 3.
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 the HandsFreeLink control unit. If the symptom does not go away, replace the audio unit, with ELS audio system, Audio Unit Removal/Installation (With AcuraLink) with premium audio system. Audio Unit Removal/Installation (With Premium Audio System)
18. Turn the ignition switch to LOCK (0).
19. Disconnect the HandsFreeLink control unit 28P connector and the HFL switch 7P connector.
20. 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.
