HandsFreeLink System Symptom Troubleshooting - HFL does not work properly
HFL does not work properly
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.
The front HFL-navigation-ANC/active sound control microphone and the front HFL-ANC/active sound control microphone are the same parts.
1.
HFL switch input check:

HFL switch input check
?1.
Turn the vehicle to the ON mode.

?2.
Display audio type: Go into the System Diagnostic Mode, and use the Hard Key to check the HFL switch (PICK-UP button, HANG-UP/BACK button, TALK button);

Color audio type: Go into the System Diagnostic Mode, and use the Knob Check in the Version/System to check the HFL switch (PICK-UP button, HANG-UP/BACK button, TALK button).

Does all the HFL switch buttons respond?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
2.
Bluetooth module check:

Bluetooth module check
?1.
Display audio type: Go into the System Diagnostic Mode, and use the HFL/Mic to check the Bluetooth Connection Diagnosis;

Color audio type: Go into the System Diagnostic Mode, and use the Version Display in the Version/System to check the Bluetooth module.

Does the status indicate OK?

     
YES: Display audio type
     
     
     
Go to step 3.
     
YES: Color audio type
     
     
     
Go to step 4.
     
NO: With navigation
     
     
     
     
NO: Without navigation
     
     
     
3.
Microphone input check (display audio type):

Microphone input check (display audio type)
?1.
Go into the System Diagnostic Mode, and use the HFL/Mic to check the microphone;

?2.
Press the TALK button, then say ‘‘testing’’ in front of the microphone to check the Mic level.

Is the microphone level OK?

     
YES
     
     
     
Go to step 5.
     
NO
     
     
     
Go to step 7.
4.
In Line Diag check (color audio type):

In Line Diag check (color audio type)
?1.
Go into the System Diagnostic Mode, and use the In Line Diag in the Version/System to check the microphone connection.

Does the HFL MIC indicate OK?

     
YES
     
     
     
Go to step 5.
     
NO
     
     
     
Go to step 7.
5.
Mobile phone connection check (known-good phone):

Mobile phone connection check (known-good phone)
?1.
Turn the vehicle to the OFF (LOCK) mode then the ON mode.

?2.
Pair a known-good cell phone with Bluetooth to the customer's vehicle.

Can you pair the cell phone?

     
YES
     
     
     
Go to step 6.
     
NO: With navigation
     
     
     
     
NO: Without navigation
     
     
     
6.
Problem verification:

Problem verification
?1.
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.?
7.
Determine possible failure area (microphone signal circuit, others):

Determine possible failure area (microphone signal circuit, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
HFL microphone 8P connector

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
HFL microphone 8P connector: disconnected
Test point 1
HFL microphone 8P connector No. 1
Test point 2
HFL microphone 8P connector No. 2

Is there about 8.0 V?

     
YES
     
     
     
Go to step 8.
     
NO
     
     
     
Go to step 11.
8.
Determine possible failure area (MIC PWR line, others):

Determine possible failure area (MIC PWR line, others)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
HFL microphone 8P connector: disconnected
Test point 1
HFL microphone 8P connector No. 4
Test point 2
Body ground

Is there about 8.0 V?

     
YES
     
     
     
     
NO
     
     
     
Go to step 9.
9.
Open wire check (MIC PWR line):

Open wire check (MIC PWR line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
HFL microphone 8P connector: disconnected
Test point 1
Audio-navigation unit connector C (32P) (with navigation) No. 7
 
Audio unit connector C (32P) (without navigation) No. 7
Test point 2
Body ground

Is there about 8.0 V?

     
YES
     
     
     
Repair an open in the wire.?
     
NO
     
     
     
The MIC PWR wire is not open. Go to step 10.
10.
Shorted wire check (MIC PWR line):

Shorted wire check (MIC PWR line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Audio-navigation unit connector C (32P) (with navigation)
Audio unit connector C (32P) (without navigation)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
HFL microphone 8P connector: disconnected
 
Audio-navigation unit connector C (32P) (with navigation): disconnected
Audio unit connector C (32P) (without navigation): disconnected
Test point 1
Audio-navigation unit connector C (32P) (with navigation) No. 7
 
Audio unit connector C (32P) (without navigation) No. 7
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
Repair a short to body ground in the wire.?
     
NO: With navigation
     
     
     
     
NO: Without navigation
     
     
     
11.
Determine possible failure area (MIC GND line, others):

Determine possible failure area (MIC GND line, others)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
HFL microphone 8P connector: disconnected
Test point 1
HFL microphone 8P connector No. 2
Test point 2
Body ground

Is there about 8.0 V?

     
YES
     
     
     
There is an open in the wire. Replace the affected shielded harness.?
     
NO
     
     
     
Go to step 12.
12.
Open wire check (MIC? line):

Open wire check (MIC? line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
HFL microphone 8P connector: disconnected
Test point 1
Audio-navigation unit connector C (32P) (with navigation) No. 22
 
Audio unit connector C (32P) (without navigation) No. 22
Test point 2
Body ground

Is there about 8.0 V?

     
YES
     
     
     
There is an open in the wire. Replace the affected shielded harness.?
     
NO
     
     
     
The MIC? wire is not open. Go to step 13.
13.
Shorted wire check (MIC? line):

Shorted wire check (MIC? line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Audio-navigation unit connector C (32P) (with navigation)
Audio unit connector C (32P) (without navigation)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
HFL microphone 8P connector: disconnected
 
Audio-navigation unit connector C (32P) (with navigation): disconnected
Audio unit connector C (32P) (without navigation): disconnected
Test point 1
Audio-navigation unit connector C (32P) (with navigation) No. 22
 
Audio unit connector C (32P) (without navigation) No. 22
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
There is a short to body ground in the wire. Replace the affected shielded harness.?
     
NO
     
     
     
The MIC? wire is not shorted to ground. Go to step 14.
14.
Shorted wire check (MIC? line to MIC GND line, SH MIC line):

Shorted wire check (MIC? line to MIC GND line, SH MIC line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
HFL microphone 8P connector: disconnected
 
Audio-navigation unit connector C (32P): disconnected
Test point 1
Audio-navigation unit connector C (32P) (with navigation) No. 6
 
Audio unit connector C (32P) (without navigation) No. 6
Test point 2
Audio-navigation unit connector C (32P) (with navigation) No. 22
 
Audio unit connector C (32P) (without navigation) No. 22


Is there continuity?

     
YES
     
     
     
There is a short in the wires. Replace the affected shielded harness.?
     
NO: With navigation
     
     
     
     
NO: Without navigation