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.
An audio-navigation unit*1 is for the vehicle with navigation, an audio unit*2 is for the vehicle without navigation.
1.
HFL switch input check:

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

?2.
Go into the System Diagnostic Mode, and use the Hard Key to check the HFL switch.

Does all the HFL switch buttons respond?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Go to step 5.
2.
System Diagnostic Mode check:

System Diagnostic Mode check
?1.
Go into the System Diagnostic Mode, and use the HFT/Mic to check the Bluetooth module/HFL microphone connection.

Does all the status indicate OK?

     
YES
     
     
     
Go to step 3.
     
NO: Bluetooth Module is NG
     
     
     
     
NO: Mic Connection or Status is NG
     
     
     
3.
Cell phone connection check (known-good phone):

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

Cell phone connection check (customer's phone)
?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.?
5.
Determine possible failure area (HFL switch circuit, others):

Determine possible failure area (HFL switch circuit, others)
?1.
Go into the System Diagnostic Mode, and use the Hard Key to check the audio remote switch.

Does all the audio remote switch buttons respond?

     
YES
     
     
     
Go to step 6.
     
NO
     
     
     
6.
HFL switch check:

HFL switch check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
HFL switch 7P connector

?3.
Do the HFL Switch Test.

Is the HFL switch OK?

     
YES
     
     
     
Go to step 7.
     
NO
     
     
     
7.
Shorted wire check (HFT/NAVI REMOTE SW line):

Shorted wire check (HFT/NAVI REMOTE SW line)
?1.
Disconnect the following connector.
Audio-navigation unit*1 connector A (24P)
Audio unit*2 connector A (24P)

?2.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
HFL switch 7P connector: disconnected
 
Audio-navigation unit*1 connector A (24P): disconnected
 
Audio unit*2 connector A (24P): disconnected
Test point 1
Audio-navigation unit*1 connector A (24P) No. 20
Audio unit*2 connector A (24P) No. 20
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
Repair a short to body ground in the wire. If the wire is OK, replace the cable reel.?
     
NO
     
     
     
The HFT/NAVI REMOTE SW wire is not shorted to ground. Go to step 8.
8.
Determine possible failure area (audio unit, others):

Determine possible failure area (audio unit, others)
?1.
Reconnect the HFL switch 7P connector.

?2.
Measure the resistance between test points 1 and 2 as specified in the table.
Test condition
Vehicle OFF (LOCK) mode
 
Audio-navigation unit*1 connector A (24P): disconnected
 
Audio unit*2 connector A (24P): disconnected
Test point 1
Audio-navigation unit*1 connector A (24P) No. 19
Audio unit*2 connector A (24P) No. 19
Test point 2
Audio-navigation unit*1 connector A (24P) No. 20
Audio unit*2 connector A (24P) No. 20

Button held down
HANG-UP/BACK
PICK-UP
TALK
No button pressed
Resistance
About 47 ?
About 222 ?
About 2.25 k?
About 10 k?

Is the resistance OK?

     
YES
     
     
     
     
NO
     
     
     
Go to step 9.
9.
Determine possible failure area (HFT/NAVI REMOTE SW line, others):

Determine possible failure area (HFT/NAVI REMOTE SW line, others)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio-navigation unit*1 connector A (24P): disconnected
 
Audio unit*2 connector A (24P): disconnected
Test point 1
Audio remote switch 12P connector No. 5 (female terminals):
Test point 2
HFL switch 7P connector No. 5 (female terminals):


Is there continuity?

     
YES
     
     
     
Repair an open in the wire. If the wire is OK, replace the cable reel.?
     
NO
     
     
     
The HFT/NAVI REMOTE SW wire is OK. Go to step 10.
10.
Audio remote switch check:

Audio remote switch check
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio-navigation unit*1 connector A (24P): disconnected
 
Audio unit*2 connector A (24P): disconnected
Test point 1
Audio remote switch 12P connector No. 4 (female terminals):
Test point 2
Audio remote switch 12P connector No. 5 (female terminals):


Is there continuity?

     
YES
     
     
     
Repair an open in the wire.?
     
NO