Poor AM Or FM Radio Reception Or Interference (Without XM Radio)
Audio System Symptom Troubleshooting - Poor AM or FM radio reception or interference
Poor AM or FM radio reception or interference (without XM)
NOTE:
- Check the vehicle battery condition first Testing and Inspection.
- Check the radio reception in an open area. Poor reception/interference can be caused by the following:
- The radio station is far away.
- A tall building, a mountain, or a high-voltage power line is nearby.
- Aftermarket window tint.
- Check for aftermarket accessories including cell phones and chargers plugged into the vehicle accessory power sockets.
1. Turn the ignition switch to ON (II).
2. Do the Seek Stop Test.
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 if the radio reception/interference is the same in several locations.
Is the reception/interference the same?
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 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. Check the AM/FM antenna mast for cracks, or other damage. Make sure that the AM/FM antenna mast isn't loose.
NOTE: Do not use any tools to tighten the AM/FM antenna mast.
Is there any damage?
YES -
Replace the AM/FM antenna mast AM/FM Antenna Replacement (Without XM Radio).�
NO -
Go to step 7.
7. Disconnect the AM/FM antenna 1P connector from the AM/FM antenna.
8. Turn the ignition switch to ON (II).
9. Turn on the audio unit.
10. Measure the voltage between AM/FM antenna 1P connector terminal and body ground.
Is there battery voltage?
YES -
Go to step 15.
NO -
Go to step 11.
11. Turn the ignition switch to LOCK (0).
12. Disconnect audio unit connector A (20P).
NOTE: Eject all the CDs before removing the audio unit to prevent damaging the CD player's load mechanism.
13. Check for continuity between audio unit connector A (20P) terminal No. 1 and AM/FM antenna 1P connector terminal.
Is there continuity?
YES -
Go to step 14.
NO -
Repair an open in the wire between the audio unit and the AM/FM antenna. Also check the AM/FM antenna lead/sublead connector.�
14. Check for continuity between audio unit connector A (20P) terminal No. 1 and body ground.
Is there continuity?
YES -
Repair a short to body ground in the wire between the audio unit and the AM/FM antenna.�
NO -
Replace the audio unit Audio Unit Removal/Installation (Without Navigation).�
15. Turn the ignition switch to LOCK (0).
16. Disconnect the AM/FM antenna sublead from the audio unit.
17. Check for continuity between the AM/FM antenna sublead center pin at the audio unit side and the AM/FM antenna lead center pin at the AM/FM antenna side.
Is there continuity?
YES -
Go to step 18.
NO -
Replace the AM/FM antenna lead and/or sublead.�
18. Check for continuity between the AM/FM antenna sublead shield surface of the audio unit side and the AM/FM antenna lead shield surface of the AM/FM antenna side.
Is there continuity?
YES -
Go to step 19.
NO -
Replace the AM/FM antenna lead and/or sublead.�
19. Check for continuity between the AM/FM antenna sublead center pin at the audio unit side and the body ground.
Is there continuity?
YES -
Replace the AM/FM antenna lead and/or sublead.�
NO -
Go to step 20.
20. Check for continuity between the AM/FM antenna sublead center pin and the shield surface of the audio unit side.
Is there continuity?
YES -
Replace the AM/FM antenna lead and/or sublead.�
NO -
Go to step 21.
21. Substitute a known-good AM/FM antenna lead and/or sublead, and check the radio operation.
Is the reception normal?
YES -
Replace the AM/FM antenna lead and/or sublead.�
NO -
Substitute a known-good AM/FM antenna AM/FM Antenna Replacement (Without XM Radio), and recheck. If the reception is still poor, replace the audio unit Audio Unit Removal/Installation (Without Navigation).�