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Home >> Honda >> 2012 >> Ridgeline RTL >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> Audio System >> Symptom Troubleshooting >> Poor AM or FM radio reception or interference

Poor AM or FM radio reception or interference

NOTE:
  • Check the vehicle battery condition first (see BATTERY TEST ).
  • Check for aftermarket accessories plugged into the vehicle accessory power sockets.
  • Check the connectors for poor connections or loose terminals.
  • Check the radio reception in an open area. Poor reception/interference can be caused by any of these conditions:
  1. Turn the ignition switch to ON (II).
  2. Do the seek Stop Test (see SEEK STOP TEST ) and the reception level indication in the Self-Diagnostic Function (see SELF-DIAGNOSTIC FUNCTION ).

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

    YES  -Multipath interference or weak station. Operation is normal. ■

    NO  -Go to step 3.

  3. Check the radio reception/interference is the same in several different locations.

    Is the reception/interference the same as a known-good vehicle in several different locations? 

    YES  -Go to step 4.

    NO  -Multipath interference or weak station. Operation is normal. ■

  4. 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 5.

  5. Turn the ignition switch to LOCK (0).
  6. Remove the rear roof trim (see REAR ROOF TRIM REPLACEMENT ).
  7. Wrap aluminum foil (A) around the tip of a tester probe (B) as shown.
    Fig 1: Identifying Aluminum Foil And Tester Probe
    G05968969Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Touch one tester probe to the antenna element 1P connector No. 1 terminal, and the other tester probe at the antenna element to check for continuity. Replace if there is no continuity.
    Fig 2: Checking Continuity Tester Probe To Antenna Element 1P Connector No. 1 Terminal
    G05968970Courtesy of AMERICAN HONDA MOTOR CO., INC.
  9. Remove the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ). Check that the AM/FM antenna sub-lead and main-lead are properly connected.

    Are they connected properly? 

    YES  -Go to step 10.

    NO  -Reconnect the connector, and recheck the function. ■

  10. Turn the ignition switch to ON (II).
  11. Turn on the audio unit, and select AM or FM.
  12. Measure the voltage between AM/FM antenna amplifier 3P connector terminal No. 3 and body ground.
    13. Fig 3: Measuring Voltage Between Antenna Cable Connector Terminal 3 And Body Ground
    G00510863Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step  18.

    NO  -Go to step 13.

  13. Tune the ignition switch to LOCK (0).
  14. Remove the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ).
    NOTE: Eject all the CDs before removing the audio unit and audio disc changer to prevent damaging the CD player's load mechanism.
  15. Disconnect audio unit connector D (3P).
  16. Check for continuity between audio unit connector D (3P) terminal No. 3 and the AM/FM antenna amplifier 3P connector terminal No. 3.
    Fig 4: Checking Continuity Between Audio Unit Connector D (3P) Terminal 3 And AM/FM Antenna Amplifier
    G00510864Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 17.

    NO  -Repair an open in the wire between the audio unit and the AM/FM antenna amplifier. Also check the AM/FM antenna lead and/or sublead connections.

  17. Check for continuity between audio unit connector D (3P) terminal No. 3 and body ground.
    Fig 5: Checking Continuity Between Audio Unit Connector D (3P) Terminal 3 And Body Ground
    G00510865Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair short to ground in the wire between the audio unit and the AM/FM antenna. ■

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

  18. Turn the ignition switch to LOCK (0).
  19. Remove the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ).
  20. Disconnect audio unit connector D (3P).
  21. Check for continuity between audio unit connector D (3P) terminal No. 1 and AM/FM antenna amplifier 3P connector terminal No. 1.
    Fig 6: Checking Continuity Between Audio Unit Connector D (3P) Terminal 1 And AM/FM Antenna Amplifier 3P
    G05968974Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 22.

    NO  -Replace the AM/FM antenna lead and/or the sublead. ■

  22. Check for continuity between audio unit connector D (3P) terminal No. 1 and body ground.
    Fig 7: Checking Continuity Between Audio Unit Connector D (3P) Terminal 1 And Body Ground
    G05968975Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Replace the AM/FM antenna lead and/or the sublead. ■

    NO  -Go to step 23.

  23. Check for continuity between audio unit connector D (3P) terminal No. 2 and AM/FM antenna amplifier 3P connector terminal No. 2.
    Fig 8: Checking Continuity Between Audio Unit Connector D (3P) Terminal 2 And AM/FM Antenna Amplifier 3P No. 2
    G05968976Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 24.

    NO  -Replace the AM/FM antenna lead and/or the sublead. ■

  24. Check for continuity between audio unit connector D (3P) terminals No. 1 and No. 2.
    Fig 9: Checking Continuity Between Audio Unit Connector D (3P) Terminals No. 1 And No. 2
    G05968977Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Replace the AM/FM antenna lead and/or the sublead. ■

    NO  -Replace the AM/FM antenna amplifier (see AM/FM ANTENNA AMPLIFIER REPLACEMENT ), and recheck. If the reception is still poor, substitute a known-good audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ), and recheck. If the symptom/indication goes away, replace the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ).

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