The HFL Messages Cannot Be Heard of Are Weak
The HFL messages cannot be heard of are weak1. 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/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 Index, Symptom Troubleshooting.
3. Press the HFL talk button.
Does 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 the audio unit connector C (28P) and the HandsFreeLink control unit 22P connector.
6. Check for continuity between HandsFreeLink control unit 22P connector No. 7 and No. 19 terminals and audio unit connector C (28P) No. 27 and No. 13 terminals.
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 (28P) No. 27 and No. 13 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 (28P) according to the table.
Is there continuity?
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 goes away, replace the original HandsFreeLink control unit. If the symptom does not go away, replace the audio unit.
9. Press the HFL talk button.
Does the MID display the HFL menu and the subdisplay show HandsFreeLink, when pressing the HFL talk button?
YES - Go to step 10.
NO - Go to step 14.
10. Turn the ignition switch to LOCK (0).
11. Disconnect HandsFreeLink control unit 22P connector and audio unit connector C (28P).
12. Check for continuity between HandsFreeLink control unit 22P connector No. 4 terminal and audio unit connector C (28P) No. 28 terminal.
Is there continuity?
YES - Go to step 12.
NO - Repair open in the wire between HandsFreeLink control unit and audio unit.
13. Check for continuity between body ground and HandsFreeLink control unit 22P connector No. 4 terminals.
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 symptom goes away, replace the original HandsFreeLink control unit. If the symptom does not go away, replace the audio unit.
14. Turn the ignition switch to LOCK (0).
15. Disconnect the HandsFreeLink control unit 22P connector and HFL switch 7P connector.
16. Check for continuity between HandsFreeLink control unit 22P connector No. 2 terminal and HFL switch 7P connector No. 4 terminal.
Is there continuity?
YES - Refer to HFL Switch Test HFL Switch Test.
NO - Repair open in the wire between HandsFreeLink control unit and HFL switch.