Audio System - Poor AM or FM radio reception or interference(Without Navigation (Without Touch Screen))

Poor AM or FM radio reception or interference

NOTE:

Check the vehicle battery condition first .
Check for aftermarket accessories plugged into the vehicle accessory power sockets.
Check for any radio frequency modulators that are plugged into the FM antenna lead. These modulators allow clients to play audio from accessories like CD players or game consoles using the audio system, but they can create interference issues.
Check the radio reception in an open area. Compare it to a known-good vehicle whenever possible. Poor reception/interference can be caused by the following:
- -
  The radio station is far away
- -
  Atmospheric conditions are unfavorable
- -
  Tall buildings, mountains, or high-voltage power lines are nearby
- -
  Electrical loads like the rear window defroster, seat heaters, game consoles, etc.
Check the connectors for poor connections or loose terminals.

Problem verification
-1. Press the engine start/stop button to select the ON mode.

-2. Do the Seek Stop Test in the Sound Quality Diagnosis .

Is the test vehicle within 10 % of the known-good vehicle?

YES

Multipath interference or weak station. Operation is normal.

NO

The failure is duplicated, go to step 2.
Determine possible failure area (charging system and ignition system, others)
-1. Start the engine, and turn on the electrical loads one at a time (defrosters, seat heaters, blower motor, etc.).

-2. Check the reception/interference while the engine is running.

Is there noise (static or whine) only with the engine running?

YES

Check the antenna and radio grounds. If OK, check the charging system and the ignition system.

NO

Go to step 3.

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

-1. Press the engine start/stop button to select the OFF mode.

-2. Disconnect the following connector.

AM/FM/XM antenna 3P connector

-3. Press the engine start/stop button to select the ON mode.

-4. Turn on the audio unit.

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

Test condition	ON mode
	AM/FM/XM antenna 3P connector: disconnected

Test circuit	SWD +B
Test point 1	AM/FM/XM antenna 3P connector 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 4.

Go to step 9.

Open wire check (AM/FM line)

-1. Press the engine start/stop button to select the OFF mode.

-2. Disconnect the following connector.

Audio unit connector D (3P)

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

Test condition	OFF mode
	AM/FM/XM antenna 3P connector: disconnected
	Audio unit connector D (3P): disconnected
Test circuit	AM/FM
Test point 1	Audio unit connector D (3P) No. 2
Test point 2	AM/FM/XM antenna 3P connector No. 2

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

Is there continuity?

YES

The AM/FM wire is not open. Go to step 5.

Replace the AM/FM antenna lead and/or the sublead.

Shorted wire check (AM/FM line)

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

Test condition	OFF mode
	AM/FM/XM antenna 3P connector: disconnected
	Audio unit connector D (3P): disconnected
Test circuit	AM/FM
Test point 1	Audio unit connector D (3P) No. 2
Test point 2	Body ground

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

Is there continuity?

YES

Replace the AM/FM antenna lead and/or the sublead.

The AM/FM wire is not shorted to ground. Go to step 6.

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

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

Test condition	OFF mode
	AM/FM/XM antenna 3P connector: disconnected
	Audio unit connector D (3P): disconnected
Test circuit	SH (AM/FM)
Test point 1	Audio unit connector D (3P) No. 3
Test point 2	AM/FM/XM antenna 3P connector No. 3

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

Is there continuity?

YES

The SH (AM/FM) wire is not open. Go to step 7.

Replace the AM/FM antenna lead and/or the sublead.

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

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

Test condition	OFF mode
	AM/FM/XM antenna 3P connector: disconnected
	Audio unit connector D (3P): disconnected
Test circuit	AM/FM, SH (AM/FM)
Test point 1	Audio unit connector D (3P) No. 2
Test point 2	Audio unit connector D (3P) No. 3

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

Is there continuity?

YES

Replace the AM/FM antenna lead and/or the sublead.

The AM/FM antenna lead and the sublead are OK. Go to step 8.

Audio unit check
-1. Substitute a known-good AM/FM/XM antenna .

-2. Reconnect all the connectors, and recheck.

Does the symptom go away?

YES

Replace the original AM/FM/XM antenna.

NO

Replace the audio unit .

Open wire check (SWD +B line)

-1. Press the engine start/stop button to select the OFF mode.

-2. Disconnect the following connector.

Audio unit connector D (3P)

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

Test condition	OFF mode
	AM/FM/XM antenna 3P connector: disconnected
	Audio unit connector D (3P): disconnected
Test circuit	SWD +B
Test point 1	Audio unit connector D (3P) No. 1
Test point 2	AM/FM/XM antenna 3P connector No. 1

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

Is there continuity?

YES

The SWD +B wire is not open. Go to step 10.

Repair an open in the wire between the audio unit and the AM/FM/XM antenna.

Shorted wire check (SWD +B line)

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

Test condition	OFF mode
	AM/FM/XM antenna 3P connector: disconnected
	Audio unit connector D (3P): disconnected
Test circuit	SWD +B
Test point 1	AM/FM/XM antenna 3P 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 audio unit and the AM/FM/XM antenna.

Replace the audio unit .