HFL Message Cannot Be Heard or Are Weak
HFL message cannot be heard or are weakNOTE: Vehicles equipped with AcuraLink, go to AcuraLink messages cannot be heard or are weak.
1. Turn the ignition switch ON (II).
2. Check that the audio system is operating normally and the speaker sound levels from different audio sources (AM/FM, XM, CD/DVDs, 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. Symptom Related Diagnostic Procedures
3. Check the audio system when HFL messages are played.
Dose the audio system mute when HFL messages are being played?
YES - Go to step 4.
NO - Go to step 9.
4. Turn the ignition switch to LOCK (0).
5. Disconnect audio unit connector connector C (40P) and HandsFreeLink control unit 28P connector.
6. Check for continuity between HandsFreeLink control unit 28P connector No. 11 and No. 25 terminals and audio unit connector C (40P) No. 13 and No. 12 terminals individually.
Is there continuity?
YES - Go to step 7.
NO - Open in the wire(s) between HandsFreeLink control unit and audio unit. Replace the affected shielded harness.
7. Check for continuity between body ground and audio unit connector C (40P) No. 13 and No. 12 terminals individually.
Is there continuity?
YES - Short to body ground in the wire(s) between HandsFreeLink control unit and audio unit. Replace the affected shielded harness.
NO - Go to step 8.
8. Check for continuity between the terminals of audio unit connector C (40P) according to the table.
Is there continuity between any of the terminals?
YES - Short in the wire(s) between HandsFreeLink control unit and audio unit. Replace the appropriate shielded harness.
NO - Substitute a known-good HandsFreeLink control unit and recheck. If the symptom/indication goes away, replace the original HandsFreeLink control unit. If the symptom/indication is still present, replace the audio unit.
9. Turn the ignition switch to LOCK (0).
10. Disconnect HandsFreeLink control unit 28P connector and audio unit connector C (40P).
11. Check for continuity between HandsFreeLink control unit 28P connector No. 3 terminal and audio unit connector C (40P) No. 14 terminal.
Is there continuity?
YES - Go to step 12.
NO - Repair open in the wire between HandsFreeLink control unit and audio unit.
12. Check for continuity between body ground and HandsFreeLink control unit 28P connector No. 3 terminal.
Is there continuity?
YES - Repair short to body ground in the wire between HandsFreeLink control unit and audio unit.
NO - Substitute a known-good HandsFreeLink control unit and recheck. If the symptom/indication goes away, replace the original HandsFreeLink control unit. If the symptom/indication is still present, replace the audio unit.