Symptom Troubleshooting
Audio System Symptom Troubleshooting - Poor AM or FM radio reception or interference
Poor AM or FM radio reception or interference (with navigation)
NOTE:
- Check the vehicle battery condition first Testing and Inspection.
- 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. 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.
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. Start the engine.
5. Check the reception/interference.
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 6.
6. Turn the ignition switch to LOCK (0).
7. Check the AM/FM/XM antenna or AM/FM antenna mast for cracks or other damage. Verify that the AM/FM/XM antenna or AM/FM antenna mast is not loose.
NOTE: Do not use any tools to tighten the AM/FM/XM antenna or AM/FM antenna mast.
Is there any damage?
YES -
Replace the AM/FM/XM antenna mast AM/FM/XM Antenna Replacement, or AM/FM antenna mast Service and Repair.�
NO -
Go to step 8.
8. Disconnect the AM/FM/XM antenna or AM/FM antenna 3P connector.
9. Turn the ignition switch to ON (II) and turn on the audio system.
10. Measure the voltage between AM/FM/XM antenna or AM/FM antenna 3P connector terminal No. 3 and body ground.
Is there battery voltage?
YES -
Go to step 11.
NO -
Go to step 17.
11. Turn the ignition switch to LOCK (0).
12. Remove the audio-navigation unit Audio-Navigation Unit Removal/Installation.
13. Check for continuity between audio-navigation unit connector G (3P) terminal No. 1 and AM/FM/XM antenna or AM/FM antenna 3P connector terminal No. 1.
Is there continuity?
YES -
Go to step 14.
NO -
Replace the AM/FM antenna lead and/or sublead.�
14. Check for continuity between audio-navigation unit connector G (3P) terminal No. 1 and body ground.
Is there continuity?
YES -
Replace the AM/FM antenna lead and/or sublead.�
NO -
Go to step 15.
15. Check for continuity between audio-navigation unit connector G (3P) terminal No. 2 and AM/FM/XM antenna or AM/FM antenna 3P connector terminal No. 2.
Is there continuity?
YES -
Replace the AM/FM antenna lead and/or sublead.�
NO -
Go to step 16.
16. Check for continuity between audio-navigation unit connector G (3P) terminals No. 1 and No. 2.
Is there continuity?
YES -
Replace the AM/FM antenna lead and/or sublead.�
NO -
Replace the AM/FM/XM antenna or AM/FM antenna Service and Repair, and recheck. If the reception is still poor, replace the audio-navigation unit Audio-Navigation Unit Removal/Installation.�
17. Turn the ignition switch to LOCK (0).
18. Remove the audio-navigation unit Audio-Navigation Unit Removal/Installation.
19. Check for continuity between audio-navigation unit connector G (3P) terminal No. 3 and AM/FM/XM antenna or AM/FM antenna 3P connector terminal No. 3.
Is there continuity?
YES -
Go to step 20.
NO -
Repair an open in the wire between the audio-navigation unit and the AM/FM/XM antenna or AM/FM antenna.�
20. Check for continuity between AM/FM/XM antenna 3P connector or AM/FM antenna 3P connector terminal No. 3 and body ground.
Is there continuity?
YES -
Repair a short to body ground in the wire between the audio-navigation unit and the AM/FM/XM antenna or AM/FM antenna.�
NO -
Substitute a known-good audio-navigation unit Audio-Navigation Unit Removal/Installation, and recheck.�