Honda HR-V: Poor AM Or FM Radio Reception Or Interference (With Navigation)

NOTE:

• Check the vehicle 12 volt battery condition first.
• Check for aftermarket accessories plugged into the vehicle accessory power sockets.
• 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
  • Aftermarket metallic window tinting or electronic accessories
• Check the connectors for poor connections or loose terminals.

1. Problem verification:

1. Turn the vehicle to the ON mode.
2. Do the Seek Stop Test in the Sound Quality Diagnosis - Refer to: Audio System Sound Quality Diagnosis, or Audio System Diagnostic Mode (Without Navigation, Display Audio Type (7-inch Screen) ), or Audio System Diagnostic Mode (Without Navigation, Color Audio Type (5-inch Screen) ).

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.

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, 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.

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

1. Disconnect the following connector.

Roof antenna connector A (3P)

2. Turn the vehicle to the ON mode, and turn on the audio system.
3. Measure the voltage between test points 1 and 2.

Is there battery voltage?

YES

The SWD +B wire is OK. Go to step 4.

NO

Go to step 9.

4. Open wire check (AM/FM line):

1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect the following connector.

Audio-navigation unit connector E (3P)

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

Is there continuity?

YES

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

NO

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

5. Shorted wire check (AM/FM line).

Check for continuity between test points 1 and 2.

Is there continuity?

YES

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

NO

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

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

Check for continuity between test points 1 and 2.

Is there continuity?

YES

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

NO

The AM/FM wire is OK. Go to step 7.

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

Check for continuity between test points 1 and 2.

Is there continuity?

YES

The SH (AM/FM) wire is OK. Go to step 8.

NO

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

8. Roof antenna check (substitution):

1. Substitute a known-good roof antenna.
2. Reconnect all the connectors, and recheck.

Does the symptom go away?

YES

Replace the original roof antenna.

NO

Replace the audio-navigation unit.

9. Open wire check (SWD +B line):

1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect the following connector.

Audio-navigation unit connector E (3P)

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

Is there continuity?

YES

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

NO

Repair an open in the wire between the audio-navigation unit and the roof antenna.

10. Shorted wire check (SWD +B line).

Check for continuity between test points 1 and 2.

Is there continuity?

YES

Repair a short to body ground in the wire between the audio-navigation unit and the roof antenna.

NO

Replace the audio-navigation unit.

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