HandsFreeLink System Symptom Troubleshooting - HFL does not respond
HFL does not respond
NOTE:
Check the vehicle 12 volt battery condition first.
You must be able to duplicate the customer's concern to successfully diagnose the problem. If you cannot duplicate the issue, have the customer demonstrate it.
Check the connectors for poor connections or loose terminals.
1.
Cell phone connection check (known-good phone):

Cell phone connection check (known-good phone)
?1.
Pair a known-good cell phone with Bluetooth to the customer's vehicle.

Can you pair the cell phone?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
2.
Operation check (microphone):

Operation check (microphone)
?1.
Make a call to someone for testing, and check the microphone is properly working.

Is the microphone working?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
Go to step 4.
3.
Cell phone connection check (customer's phone):

Cell phone connection check (customer's phone)
?1.
Disconnect the paired known-good cell phone.

?2.
Pair the customer's cell phone with Bluetooth to the customer's vehicle.

Can you pair the cell phone, and does it operate normally?

     
YES
     
     
     
The HFL system is OK at this time. Inquire if there are any known issues for the problem.?
     
NO
     
     
     
The customer's cell phone is defective or not compatible.?
4.
Audio panel check (substitution):

Audio panel check (substitution)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Substitute a known-good audio panel, and recheck.

Does the symptom go away?

     
YES
     
     
     
Replace the audio panel.?
     
NO