Audio System DTC Troubleshooting: 2707
DTC 2707: Mic Diag
NOTE:
Check the vehicle battery condition first.
This navigation DTC sets when a problem is detected in the microphone circuit (the Mic icon is red in the System Link).
Before you troubleshoot, make sure to follow the General Troubleshooting Information.
Check the connectors for poor connections loose terminal.
1.
Problem verification:

Problem verification
?1.
Clear the hard error codes.

?2.
Turn the vehicle to the OFF (LOCK) mode then the ON mode.

?3.
Check for hard error codes.

Is DTC 2707 indicated?

     
YES
     
     
     
The failure is duplicated, go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time.?
2.
Determine possible failure area (MIC PWR line, others):

Determine possible failure area (MIC PWR line, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Front HFL-ANC/active sound control 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
 
Front HFL-ANC/active sound control microphone 8P connector: disconnected
 
Test point 1
Front HFL-ANC/active sound control microphone 8P connector No. 4
Test point 2
Body ground

Is there about 8.0 V?

     
YES
     
     
     
The MIC PWR wire is OK. Go to step 5.
     
NO
     
     
     
Go to step 3.
3.
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
 
Front HFL-ANC/active sound control microphone 8P connector: disconnected
 
Test point 1
Audio unit connector J (28P) No. 25
Test point 2
Body ground

Is there about 8.0 V?

     
YES
     
     
     
Repair an open in the wire between the front HFL-ANC/active sound control microphone and the audio unit.?
     
NO
     
     
     
The MIC PWR wire is not open. Go to step 4.
4.
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 unit connector J (28P)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Front HFL-ANC/active sound control microphone 8P connector: disconnected
 
Audio unit connector J (28P): disconnected
 
Test point 1
Audio unit connector J (28P) No. 25
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
Repair a short to body ground in the wire between the front HFL-ANC/active sound control microphone and the audio unit.?
     
NO
     
     
     
5.
Determine possible failure area (Front HFL-ANC/active sound control microphone, others):

Determine possible failure area (Front HFL-ANC/active sound control microphone, others)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
Front HFL-ANC/active sound control microphone 8P connector: disconnected


Is there about 8.0 V?

     
YES
     
     
     
     
NO
     
     
     
Go to step 6.
6.
Determine possible failure area (MIC+ line, others):

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

Is there about 8.0 V?

     
YES
     
     
     
The MIC+ wire is OK. Go to step 9.
     
NO
     
     
     
Go to step 7.
7.
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
 
Front HFL-ANC/active sound control microphone 8P connector: disconnected
 
Test point 1
Audio unit connector J (28P) No. 11
Test point 2
Body ground

Is there about 8.0 V?

     
YES
     
     
     
There is an open in the wire(s) between the front HFL-ANC/active sound control microphone 8P connector and the audio unit. Replace the affected shielded harness.?
     
NO
     
     
     
The MIC+ wire is not open. Go to step 8.
8.
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 unit connector J (28P)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Front HFL-ANC/active sound control microphone 8P connector: disconnected
 
Audio unit connector J (28P): disconnected
 
Test point 1
Audio unit connector J (28P) No. 11
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
There is a short to body ground in the wire between the front HFL-ANC/active sound control microphone and the audio unit. Replace the affected shielded harness.?
     
NO
     
     
     
The MIC+ wire is not shorted to ground. Go to step 9.
9.
Open wire check (MIC? line):

Open wire check (MIC? line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Front HFL-ANC/active sound control microphone 8P connector: disconnected
 
Audio unit connector J (28P): disconnected


Is there continuity?

     
YES
     
     
     
The MIC? wire is not open. Go to step 10.
     
NO
     
     
     
There is an open in the wire(s) between the front HFL-ANC/active sound control microphone and the audio unit. Replace the affected shielded harness.?
10.
Shorted wire check (MIC+ line to MIC? line, SH_MIC line):

Shorted wire check (MIC+ line to MIC? line, SH_MIC line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Front HFL-ANC/active sound control microphone 8P connector: disconnected
 
Audio unit connector J (28P): disconnected
 
Test point 1
Audio unit connector J (28P) No. 11
Test point 2
Audio unit connector J (28P) No. 10


Is there continuity?

     
YES
     
     
     
There is a short in the wires between the front HFL-navigation-ANC/active sound control microphone and the audio unit. Replace the affected shielded harness.?
     
NO