Honda CR-V: Poor AM or FM radio reception or interference (with navigation)

Honda CR-V (2006–2011) Service Manual / Audio, Navigation, and Telematics / Audio System / Symptom Troubleshooting / Poor AM or FM radio reception or interference (with navigation)

NOTE:

1. Do the seek stop test.

Does the test vehicle receive 90 % of the same status as the known-good vehicle? YES-Multi path interference or weak station.

Operation is normal at this time.

NO-Go to step 2.

2. Check if the radio reception/interference is the same as the known-good vehicle in several locations.

Is the reception/interference the same? YES-Go to step 3.

NO-Multipath interference or weak station.

Operation is normal.

3. Check the reception/interference while the engine is running, and compare it to the known-good vehicle.

Is there noise (static or whine) only with the engine running? YES-Check the antenna and radio grounds. If OK, check the charging system, fuel injection system (fuel pump), HVAC (blower motor), and the ignition system.

NO-Go to step 4.

4. Check the antenna mast for cracks, or other damage. Make sure that the AM/FM/XM antenna is not loose.

NOTE: Do not use any tools to tighten the antenna mast.

Is there any damage? YES-Replace the AM/FM/XM antenna.

NO-Go to step 5.

5. Disconnect the antenna cable 3P connector from the AM/FM/XM antenna.

6. Measure the voltage between the antenna amplifier connector No.3 terminal at the antenna amplifier lead and body ground.

Honda CR-V. Audio System

Is there battery voltage? YES-Go to step 11.

NO-Go to step 7.

7. Remove the navigation unit.

8. Disconnect navigation unit connector G (3P).

9. Check for continuity between navigation unit connector G (3P) No.3 terminal and the antenna amplifier 3P connector No.3 terminal.

Honda CR-V. Audio System

Is there continuity? YES-Go to step 10.

NO-Repair open in the wire between the navigation unit and the antenna amplifier.

10. Check for continuity between the antenna amplifier connector (3P) No.3 terminal and body ground.

Honda CR-V. Audio System

Is there continuity? YES-Repair short in the wire between the navigation unit and the antenna amplifier.

NO-Substitute a known-good navigation unit, and recheck.

11. Remove the navigation unit.

12. Check for continuity between navigation unit connector G (3P) No.1 terminal and the antenna amplifier 3P connector No.1 terminal.

Honda CR-V. Audio System

Is there continuity? YES-Go to step 13.

NO-Replace the antenna lead and/or sublead.

13. Check for continuity between navigation unit connector G (3P) No.1 terminal and body ground.

Honda CR-V. Audio System

Is there continuity? YES-Replace the antenna lead and/or sublead.

NO-Go to step 14.

14. Check for continuity between navigation unit connector G (3P) No.2 terminal and the antenna amplifier 3P connector No.2 terminal.

Honda CR-V. Audio System

Is there continuity? YES-Go to step 15.

NO-Replace the antenna lead and/or sublead.

15. Check for continuity between navigation unit connector G (3P) No.1 and No.2 terminals.

Honda CR-V. Audio System

Is there continuity? YES-Replace the antenna lead and/or sublead.

NO-Replace the antenna amplifier, and recheck. If the reception is still poor, replace the navigation unit.

Poor AM or FM radio reception or interference (without navigation)

NOTE:

1. Do the seek stop test.

Does the test vehicle receive 90 % of the same stations as the known-good vehicle? YES-Multipath interference or weak station.

Operation is normal at this time.

NO-Go to step 2.

2. Check if the radio reception/interference is the same as the known-good vehicle in several locations.

Is the reception/interference the same? YES-Go to step 3.

NO-Multipath interference or weak station.

Operation is normal.

3. Check the reception/interference while the engine is running and compare it to the known-good vehicle.

Is there noise (static or whine) only with the engine running? YES-Check the antenna and radio grounds. If OK, check the charging system, fuel injection system (fuel pump), HVAC (blower motor), and the ignition system.

NO-Go to step 4.

4. Check the antenna mast for cracks, or other damage. Make sure that the AM/FM/XM antenna is not loose.

NOTE: Do not use any tools to tighten the antenna mast.

Is there any damage? YES-Replace the AM/FM/XM antenna.

NO-Go to step 5.

5. Disconnect the antenna cable 3P connector from the AM/FM/XM antenna.

6. Measure the voltage between the antenna cable connector No.3 terminal at the antenna amplifier lead and body ground.

Honda CR-V. Audio System

Is there battery voltage? YES-Go to step 11.

NO-Go to step 7.

7. Remove the audio unit.

8. Disconnect audio unit connector G (3P).

9. Check for continuity between audio unit connector G (3P) No.3 terminal and the antenna amplifier 3P connector No.3 terminal.

Honda CR-V. Audio System

Is there continuity? YES-Go to step 10.

NO-Repair open in the wire between the audio unit and the antenna amplifier.

10. Check for continuity between the antenna amplifier connector (3P) No.3 terminal and body ground.

Honda CR-V. Audio System

Is there continuity? YES-Repair short in the wire between the audio unit and the antenna amplifier.

NO-Substitute a known-good audio unit, and recheck.

11. Remove the audio unit.

12. Check for continuity between audio unit connector G (3P) No.1 terminal and the antenna amplifier 3P connector No.1 terminal.

Honda CR-V. Audio System

Is there continuity? YES-Go to step 13.

NO-Replace the antenna lead and/or sublead.

13. Check for continuity between audio unit connector G (3P) No.1 terminal and body ground.

Honda CR-V. Audio System

Is there continuity? YES-Replace the antenna lead and/or sublead.

NO-Go to step 14.

14. Check for continuity between audio unit connector G (3P) No.2 terminal and the antenna amplifier 3P connector No.2 terminal.

Honda CR-V. Audio System

Is there continuity? YES-Replace the antenna lead and/or sublead.

NO-Go to step 15.

15. Check for continuity between audio unit connector G (3P) No.1 and No.2 terminals.

Honda CR-V. Audio System

Is there continuity? YES-Replace the antenna lead and/or sublead.

NO-Replace the antenna amplifier, and recheck. If the reception is still poor, replace the audio unit.

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