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Poor Radio Reception Or Interference

NOTE: Check the radio reception in an open area. Poor reception/interference can be caused by any of these conditions:
  1. Do the SEEK STOP TEST  .

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

    1. YES  - Multipath interference or weak station. Operation is normal.
    2. NO  - Go to step  2.
  2. Check the reception/interference when the rear window defogger is on.

    Is the reception poor only with the rear window defogger on? 

    1. YES  - Do the rear window defogger function test, and check for a break in the rear window defogger wire (see FUNCTION TEST ).
    2. NO  - Go to step  3.
  3. Check the reception/interference while the engine is running.

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

    1. YES  - Check the antenna and radio grounds. If OK, check the charging system and the ignition system.
    2. NO  - Go to step  4.
  4. Wrap aluminum foil (A) around the tip of a tester probe (B) as shown.
    Fig 1: Wrapping Aluminum Foil Around Tip Of Tester Probe
    G03662420Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. Check for continuity by touching one tester probe to the window antenna terminal (A), and move the other tester probe along the antenna wires (for AM reception) or the defogger wire (for FM reception).
    Fig 2: Checking Continuity In Window Antenna Terminal
    G03662421Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity in all sections of the antenna? 

    1. YES  - Go to step  6.
    2. NO  - Repair the window antenna wire. Go to WINDOW ANTENNA REPAIR  , or the defogger wire (see FUNCTION TEST ).
  6. Disconnect the 1P connector (A), 1P connector (B) and antenna lead (C) from the antenna module (D).
    Fig 3: Disconnecting 1P Connector & Antenna Lead From Antenna Module
    G03662422Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. Turn the radio switch ON, and measure the voltage between the antenna module connector terminal B1 and body ground.

    Is there about 12 V? 

    1. YES  - Go to step  8.
    2. NO  - Go to step  13.
  8. Remove the audio-HVAC display module assembly (see AUDIO-HVAC DISPLAY MODULE ASSEMBLY REMOVAL/INSTALLATION ), and disconnect the antenna lead from the audio unit.
  9. Check for continuity between the antenna lead center pin at the audio unit and the antenna lead center pin at the antenna module.
    Fig 4: Checking Continuity Between Antenna Lead Center Pin & Antenna Lead Center Pin
    G03662423Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Go to step  10.
    2. NO  - Replace the antenna lead.
  10. Check for continuity between the antenna lead center pin at the audio unit and body ground.
    Fig 5: Checking Continuity Between Antenna Lead Center Pin & Body Ground
    G03662424Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Replace the antenna lead.
    2. NO  - Go to step  11.
  11. Check for continuity between the shield surface of the audio unit lead and the shield surface of the antenna module lead.
    Fig 6: Checking Continuity Between Shield Surface & Shield Surface Of Antenna Module Lead
    G03662425Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Go to step  12.
    2. NO  - Replace the antenna lead.
  12. Check for continuity between the antenna lead center pin and the surface of the antenna lead.
    Fig 7: Checking Continuity Between Antenna Lead Center Pin & Surface Of Antenna Lead
    G03662426Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity ? 

    1. YES  - Replace the antenna lead.
    2. NO  - Replace the antenna module, and recheck. If the reception is still poor, replace the audio unit.
  13. Remove the audio-HVAC display module assembly (see AUDIO-HVAC DISPLAY MODULE ASSEMBLY REMOVAL/INSTALLATION ), and disconnect the audio unit connector A (20P).
  14. Check for continuity between audio unit connector A (20P) terminal No. 1 and the antenna module connector B1 terminal.
    Fig 8: Checking Continuity Between Terminal No. 1 & Antenna Module Connector B1 Terminal
    G03662427Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Substitute a known-good audio unit and retest.
    2. NO  - Repair an open in the wire between the audio unit and the antenna module.
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