Symptom Troubleshooting
Symptom Troubleshooting: Poor AM or FM radio reception or interference
Poor AM or FM radio reception or interference (without navigation)
NOTE:
- Check the vehicle battery condition first.
- Check for aftermarket accessories including cell phones and chargers 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. Sound Quality Diagnosis - 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 antenna mast for cracks or other damage. Verify that the AM/FM antenna mast is not 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 Navigation)
NO - Go to step 8.
8. Disconnect the AM/FM antenna lead 3P connector from the AM/FM antenna.
9. Turn the ignition switch to ON (II) and turn ON the audio unit.
10. Measure the voltage between AM/FM antenna 3P connector terminal No. 3 at the AM/FM antenna 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 unit. Audio Unit Removal/Installation (Without Navigation)
13. Check for continuity between audio unit connector G (3P) terminal No. 1 and 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 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 unit connector G (3P) terminal No. 2 and 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 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 antenna, and recheck. If the reception is still poor, replace the audio unit. Audio Unit Removal/Installation (Without Navigation)
17. Turn the ignition switch to LOCK (0).
18. Remove the audio unit. Audio Unit Removal/Installation (Without Navigation)
19. Check for continuity between audio unit connector G (3P) terminal No. 3 and AM/FM antenna 3P connector terminal No. 3.
Is there continuity?
YES - Go to step 20.
NO - Repair open in the wire between the audio unit and the AM/FM antenna.
20. Check for continuity between the AM/FM antenna 3P connector terminal No. 3 and body ground.
Is there continuity?
YES - Repair short in the wire between the audio unit and the AM/FM antenna.
NO - Substitute a known-good audio unit, Audio Unit Removal/Installation (Without Navigation) and recheck.
