Audio System DTC Troubleshooting: 2707

DTC 2707: Mic Diag

NOTE:

	Check the vehicle 12 volt battery condition first.
	This audio DTC sets when a problem is detected in the microphone circuit (the Mic icon is red in the System Links).
	Before you troubleshoot, make sure to follow the General Troubleshooting Information.
	Check any official Honda service website for more service information about the audio system.
	Check the connectors for poor connections or loose terminals.

Problem verification:

Problem verification

?1.	Clear the hard error codes.

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

?3.	Do the Input Level test in the HFT/Mic diagnosis.

?4.	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.?

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.

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. 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.

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 OFF (LOCK) mode
	HFL microphone 8P connector: disconnected
	Audio unit connector B (32P): disconnected
Test point 1	Audio unit connector B (32P) 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 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 B (32P)

?3.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	HFL microphone 8P connector: disconnected
	Audio unit connector B (32P): disconnected
Test point 1	Audio unit connector B (32P) No. 7
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

Replace the audio unit.?

Determine possible failure area (microphone signal circuit, others):

Determine possible failure area (microphone signal circuit, 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. 1
Test point 2	HFL microphone 8P connector No. 2

Is there about 8.0 V?


	YES

Replace the HFL microphone.?


	NO

Go to step 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
	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

The MIC+ wire is OK. Go to step 10.


	NO

Go to step 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
	HFL microphone 8P connector: disconnected
Test point 1	Audio unit connector B (32P) 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 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 B (32P)

?3.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	HFL microphone 8P connector: disconnected
	Audio unit connector B (32P): disconnected
Test point 1	Audio unit connector B (32P) 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 9.

Shorted wire check (MIC+ line to another lines):

Shorted wire check (MIC+ line to another lines)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	HFL microphone 8P connector: disconnected
	Audio unit connector B (32P): disconnected
Test point 1	Audio unit connector B (32P) No. 6
Test point 2	Audio unit connector B (32P) No. 22

Test point 1	Audio unit connector B (32P) No. 22
Test point 2	Audio unit connector B (32P) No. 23

Is there continuity?


	YES

There is a short in the wires. Replace the affected shielded harness.?


	NO

Replace the audio unit.?

10.

Open wire check (MIC? line):

Open wire check (MIC? line)

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

?2.

Disconnect the following connector.

Audio unit connector B (32P)

?3.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	HFL microphone 8P connector: disconnected
	Audio unit connector B (32P): disconnected
Test point 1	HFL microphone 8P connector No. 1
Test point 2	Audio unit connector B (32P) No. 23

Is there continuity?


	YES

Replace the audio unit.?


	NO

There is an open in the wire. Replace the affected shielded harness.?