Navigation System Symptom Troubleshooting - Poor HD Traffic Reception Or Interference (With Display Audio) (2017)

NOTE:

Check the vehicle 12 volt battery condition first .
Check for aftermarket accessories including phones and chargers plugged into the vehicle accessory power sockets.
Check the reception in an open area. Poor reception/interference can be caused by the following;
- The radio station is far away
- Atmospheric condition are unfavorable
- Tall buildings, mountains, or high-voltage power lines are nearby
Check any official Honda service website for more service information about the navigation system.
Check the connectors for poor connections or loose terminals.

Problem verification
-1. Park the vehicle outside where you have a clear view of the southern sky.

- 2. Turn the vehicle to the ON mode.

- 3. Check if the HD traffic reception/interference is the same in several locations.

- 4. Compare to a known-good vehicle.

Is the reception/interference the same?

YES

The failure is duplicated, go to step 2.

NO

Multipath interference or weak station. Operation is normal.
Determine possible failure area (charging system and ignition system, others)
-1. Turn the vehicle to the READY TO DRIVE mode, and turn on the electrical loads one at a time (defrosters, seat heaters, blower motor, etc.).

- 2. Check if the reception/interference while the READY TO DRIVE mode.

Is there noise (static or whine) only with the READY TO DRIVE mode?

YES

Check the antenna and audio-navigation unit grounds. If OK, check the charging system and the ignition system.

NO

Go to step 3.
Roof antenna visual check
-1. Turn the vehicle to the OFF (LOCK) mode.

- 2. Check the roof antenna for cracks, or other damage.

Is there any damage?

YES

Replace the roof antenna .

NO

Go to step 4.

Determine possible failure area (SWD +B line, AM/FM line)

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

- 2. Disconnect the following connector.

Roof antenna connector A (3P)

- 3. Turn the vehicle to the ON mode.

- 4. Turn on the audio-navigation unit.

- 5. Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	Roof antenna connector A (3P): disconnected

Test point 1	Roof antenna connector A (3P) No. 1
Test point 2	Body ground

Courtesy of HONDA, U.S.A., INC.

Is there battery voltage?

YES

The SWD +B wire is OK. Go to step 8.

Go to step 5.

Open wire check (SWD +B line)

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

- 2. Disconnect the following connector.

FM distributor 5P connector

- 3. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	FM distributor 5P connector: disconnected
	Roof antenna connector A (3P): disconnected

Test point 1	FM distributor 5P connector No. 1
Test point 2	Roof antenna connector A (3P) No. 1

Courtesy of HONDA, U.S.A., INC.

Is there continuity?

YES

The SWD +B wire is not open. Go to step 6.

Repair an open in the wire between the FM distributor and the roof antenna. Also check the AM/FM antenna rear lead connector.

Shorted wire check (SWD +B line)

-1. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Roof antenna connector A (3P): disconnected
	FM distributor 5P connector: disconnected

Test point 1	FM distributor 5P connector No. 1
Test point 2	Body ground

Courtesy of HONDA, U.S.A., INC.

Is there continuity?

YES

Repair a short to body ground in the wire between the FM distributor and the roof antenna.

The SWD +B wire is OK. Go to step 7.

FM distributor check (substitution)
-1. Substitute a known-good FM distributor, and recheck.

Does the symptom go away?

YES

Replace the original FM distributor .

NO

Replace the audio-navigation unit - Refer to: Audio-Navigation Unit Removal and Installation (2014 2015), or Audio-Navigation Unit Removal and Installation (With Display Audio) (2017) .

Open wire check (TMC/AM/FM line)

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

- 2. Disconnect the following connector.

Audio-Navigation unit connector K (4P)

- 3. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Audio-Navigation unit connector K (4P): disconnected
	Roof antenna connector A (3P): disconnected

Test point 1	Audio-Navigation unit connector K (4P) No. 1 - Refer to: Audio-Navigation Unit Connector for Inputs and Outputs (2014), or Audio-Navigation Unit Connector for Inputs and Outputs (2015), or Audio-Navigation Unit Connector for Inputs and Outputs (With Display Audio) (2017)
Test point 2	Roof antenna connector A (3P) No. 2

Courtesy of HONDA, U.S.A., INC.

Is there continuity?

YES

The TMC/AM/FM wire is not open. Go to step 10.

Go to step 9

Open wire check (AM/FM line)

-1. Disconnect the following connector.

FM distributor 5P connector

- 2. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	FM distributor 5P connector: disconnected
	Roof antenna connector A (3P): disconnected

Test point 1	FM distributor 5P connector No. 2
Test point 2	Roof antenna connector A (3P) No. 2

Courtesy of HONDA, U.S.A., INC.

Is there continuity?

YES

Replace the FM distributor .

Replace the AM/FM antenna rear lead. Also check the AM/FM antenna rear lead connector.

Shorted wire check (TMC line)

-1. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Audio-Navigation unit connector K (4P): disconnected
	Roof antenna connector A (3P): disconnected

Test point 1	Audio-Navigation unit connector K (4P) No. 1 - Refer to: Audio-Navigation Unit Connector for Inputs and Outputs (2014), or Audio-Navigation Unit Connector for Inputs and Outputs (2015), or Audio-Navigation Unit Connector for Inputs and Outputs (With Display Audio) (2017)
Test point 2	Body ground

Is there continuity?

YES

Go to step 11

The TMC wire is not shorted to ground. Go to step 12.

Shorted wire check (AM/FM line)

-1. Disconnect the following connector.

FM distributor 5P connector

- 2. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	FM distributor 5P connector: disconnected
	Roof antenna connector A (3P): disconnected

Test point 1	FM distributor 5P connector No. 2
Test point 2	Body ground

Courtesy of HONDA, U.S.A., INC.

Is there continuity?

YES

Replace the AM/FM antenna rear lead.

Replace the FM distributor .

Open wire check (SH (TMC)/SH (AM/FM) line)

-1. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Audio-Navigation unit connector K (4P): disconnected
	Roof antenna connector A (3P): disconnected

Test point 1	Audio-Navigation unit connector K (4P) No. 3 - Refer to: Audio-Navigation Unit Connector for Inputs and Outputs (2014), or Audio-Navigation Unit Connector for Inputs and Outputs (2015), or Audio-Navigation Unit Connector for Inputs and Outputs (With Display Audio) (2017)
Test point 2	Roof antenna connector A (3P) No. 3

Courtesy of HONDA, U.S.A., INC.

Is there continuity?

YES

The SH (TMC)//SH (AM/FM) wire is not open. Go to step 14.

Go to step 13

Open wire check (SH (AM/FM) line)

-1. Disconnect the following connector.

FM distributor 5P connector

- 2. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	FM distributor 5P connector: disconnected
	Roof antenna connector A (3P): disconnected

Test point 1	FM distributor 5P connector No. 4
Test point 2	Roof antenna connector A (3P) No. 3

Courtesy of HONDA, U.S.A., INC.

Is there continuity?

YES

Replace the FM distributor .

Replace the AM/FM antenna rear lead. Also check the AM/FM antenna rear lead connector.

Shorted wire check (TMC line to SH (TMC) line)

-1. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Audio-Navigation unit connector K (4P): disconnected
	Roof antenna connector A (3P): disconnected

Test point 1	Audio-Navigation unit connector K (4P) No. 1 - Refer to: Audio-Navigation Unit Connector for Inputs and Outputs (2014), or Audio-Navigation Unit Connector for Inputs and Outputs (2015), or Audio-Navigation Unit Connector for Inputs and Outputs (With Display Audio) (2017)
Test point 2	Audio-Navigation unit connector K (4P) No. 3 - Refer to: Audio-Navigation Unit Connector for Inputs and Outputs (2014), or Audio-Navigation Unit Connector for Inputs and Outputs (2015), or Audio-Navigation Unit Connector for Inputs and Outputs (With Display Audio) (2017)

Is there continuity?

YES

Go to step 15.

The AM/FM antenna lead and the sublead are OK. Go to step 16.

Shorted wire check (AM/FM line to SH (AM/FM) line)

-1. Disconnect the following connector.

FM distributor 5P connector

- 2. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	FM distributor 5P connector: disconnected
	Roof antenna connector A (3P): disconnected

Test point 1	FM distributor 5P connector No. 2
Test point 2	FM distributor 5P connector No. 4

Courtesy of HONDA, U.S.A., INC.

Is there continuity?

YES

Replace the AM/FM antenna rear lead.

Replace the FM distributor .

Audio-Navigation unit check (substitution)
-1. Substitute a known-good audio-navigation unit.

- 2. Reconnect all the connectors, and recheck.

Does the symptom go away?

YES

Replace the original audio-navigation unit - Refer to: Audio-Navigation Unit Removal and Installation (2014 2015), or Audio-Navigation Unit Removal and Installation (With Display Audio) (2017) .

NO

Replace the roof antenna .