Symptom Troubleshooting
Audio System Symptom Troubleshooting - Poor AM or FM radio reception or interference
Poor AM or FM radio reception or interference
NOTE:
- Check the vehicle battery condition first Testing and Inspection.
- Check the connectors for poor connections or loose terminals.
- Check for aftermarket accessories including cell phones and chargers plugged into the vehicle accessory power sockets.
- Check the radio reception in an open area. Poor reception/interference can be caused by the following:
- The radio station is far away.
- Atmospheric conditions are unfavorable.
- Aftermarket metallic window tint.
- A tall buildings, mountains, or a high-voltage power lines are nearby.
1. Turn the ignition switch to ON (II).
2. Do the Seek Stop Test and the reception level indication in the self-diagnostic function.
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 that the radio reception/interference is the same in several different locations.
Is the reception/interference the same as a 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.
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 5.
5. Turn the ignition switch to LOCK (0).
6. Remove the rear roof trim Rear Roof Trim Replacement.
7. Wrap aluminum foil (A) around the tip of a tester probe (B) as shown.
8. Touch one tester probe to the antenna element 1P connector No. 1 terminal, and the other tester probe at the antenna element to check for continuity. Replace if there is no continuity.
9. Remove the audio unit Audio Unit Removal/Installation. Check that the AM/FM antenna sub-lead and main-lead are properly connected.
Are they connected properly?
YES -
Go to step 10.
NO -
Reconnect the connector, and recheck the function.�
10. Turn the ignition switch to ON (II).
11. Turn on the audio unit, and select AM or FM.
12. Measure the voltage between AM/FM antenna amplifier 3P connector terminal No. 3 and body ground.
Is there battery voltage?
YES -
Go to step 18.
NO -
Go to step 13.
13. Tune the ignition switch to LOCK (0).
14. Remove the audio unit Audio Unit Removal/Installation.
NOTE: Eject all the CDs before removing the audio unit and audio disc changer to prevent damaging the CD player's load mechanism.
15. Disconnect audio unit connector D (3P).
16. Check for continuity between audio unit connector D (3P) terminal No. 3 and the AM/FM antenna amplifier 3P connector terminal No. 3.
Is there continuity?
YES -
Go to step 17.
NO -
Repair an open in the wire between the audio unit and the AM/FM antenna amplifier. Also check the AM/FM antenna lead and/or sublead connections.�
17. Check for continuity between audio unit connector D (3P) terminal No. 3 and body ground.
Is there continuity?
YES -
Repair a short to ground in the wire between the audio unit and the AM/FM antenna.�
NO -
Substitute a known good audio unit Audio Unit Removal/Installation, and recheck.�
18. Turn the ignition switch to LOCK (0).
19. Remove the audio unit Audio Unit Removal/Installation.
NOTE: Eject all the CDs before removing the audio unit and audio disc changer to prevent damaging the CD player's load mechanism.
20. Disconnect audio unit connector D (3P).
21. Check for continuity between audio unit connector D (3P) terminal No. 1 and AM/FM antenna amplifier 3P connector terminal No. 1.
Is there continuity?
YES -
Go to step 22.
NO -
Replace the AM/FM antenna lead and/or the sublead.�
22. Check for continuity between audio unit connector D (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 23.
23. Check for continuity between audio unit connector D (3P) terminal No. 2 and AM/FM antenna amplifier 3P connector terminal No. 2.
Is there continuity?
YES -
Go to step 24.
NO -
Replace the AM/FM antenna lead and/or the sublead.�
24. Check for continuity between audio unit connector D (3P) terminals No. 1 and No. 2.
Is there continuity?
YES -
Replace the AM/FM antenna lead and/or the sublead.�
NO -
Replace the AM/FM antenna amplifier Service and Repair, and recheck. If the reception is still poor, substitute a known-good audio unit Audio Unit Removal/Installation, and recheck. If the symptom/indication goes away, replace the audio unit Audio Unit Removal/Installation.�