Poor AM Or FM Radio Reception Or Interference (With Navigation)
Audio System Symptom Troubleshooting - Poor AM or FM radio reception or interference (with navigation)
Poor AM or FM radio reception or interference ('10 model with navigation)
NOTE:
- Check the vehicle battery condition first Testing and Inspection.
- Check the connectors for poor connections or loose terminals.
- Check the radio reception in an open area.
- Compare it to a known-good vehicle of the same model, year, and trim level whenever possible.
- If necessary, have the customer demonstrate the symptom.
- Poor reception/interference can be caused by any of these conditions:
- The radio station is far away.
- Atmospheric conditions are unfavorable.
- Tall buildings, mountains, or high-voltage power lines are nearby.
- Aftermarket window tinting or electronic accessories.
- Non-standard antenna mast.
- Check for aftermarket accessories plugged into the vehicle accessory power sockets (including cell phones).
1. Turn the ignition switch to ON (II).
2. Do the seek stop test Audio System Sound Quality Diagnosis.
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 3.
3. Check that the radio reception/interference is the same as the known-good vehicle in several locations.
Is the reception/interference the same as the 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, 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, the fuel injection system (fuel pump), the HVAC blower motor, and the ignition system.�
NO -
Go to step 5.
5. Turn the ignition switch to LOCK (0).
6. Check the AM/FM/XM 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 AM/FM/XM antenna mast.
Is there any damage?
YES -
Replace the AM/FM/XM antenna AM/FM/XM Antenna Replacement (With XM Radio).�
NO -
Go to step 7.
7. Disconnect the AM/FM/XM antenna 3P connector.
8. Turn the ignition switch to ON (II).
9. Turn on the audio-navigation unit.
10. Measure the voltage between AM/FM antenna 3P connector terminal No. 3 and body ground.
Is there battery voltage?
YES -
Go to step 16.
NO -
Go to step 11.
11. Turn the ignition switch to LOCK (0).
12. Remove the audio-navigation unit Audio-Navigation Unit Removal/Installation.
13. Disconnect audio-navigation unit connector G (3P).
14. Check for continuity between audio-navigation unit connector G (3P) terminal No. 3 and AM/FM antenna 3P connector terminal No. 3.
Is there continuity?
YES -
Go to step 15.
NO -
There is an open in the wire between the audio-navigation unit and the AM/FM antenna. Also check the AM/FM antenna lead/sublead connector.�
15. Check for continuity between AM/FM antenna 3P connector terminal No. 3 and body ground.
Is there continuity?
YES -
Repair a short in the wire between the audio-navigation unit and the AM/FM antenna.�
NO -
Substitute a known-good audio-navigation unit Audio-Navigation Unit Removal/Installation, and recheck.�
16. Remove the audio-navigation unit Audio-Navigation Unit Removal/Installation.
17. Check for continuity between audio-navigation unit connector G (3P) terminal No. 1 and AM/FM antenna 3P connector terminal No. 1.
Is there continuity?
YES -
Go to step 18.
NO -
Replace the AM/FM antenna lead and/or the sublead.�
18. 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 the sublead.�
NO -
Go to step 19.
19. Check for continuity between audio-navigation unit connector G (3P) terminal No. 2 and AM/FM antenna 3P connector terminal No. 2.
Is there continuity?
YES -
Go to step 20.
NO -
Replace the AM/FM antenna lead and/or the sublead.�
20. 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 the sublead.�
NO -
Go to step 21.
21. Substitute a known-good AM/FM antenna lead and/or sublead, and check the radio reception.
Is the reception normal?
YES -
Replace the AM/FM antenna lead and/or sublead.�
NO -
Substitute a known-good AM/FM/XM antenna AM/FM/XM Antenna Replacement (With XM Radio), and recheck. If the reception is still poor, replace the audio-navigation unit Audio-Navigation Unit Removal/Installation.�