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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 Battery Test.
- 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 any of these conditions:
- The radio station is far away
- Atmospheric conditions are unfavorable
- A tall building, mountains, or 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 Audio System 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 the 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 (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. Check the AM/FM antenna mast for cracks, or other damage. Verify that the AM/FM antenna mast is tight.

NOTE: Do not use any tools to tighten the AM/FM antenna mast.

Is there any damage?

YES -

Replace the AM/FM antenna mast:

- With premium audio [1][2]Antenna, Radio.
- Without premium audio Service and Repair.

NO -

Go to step 7.

7. Disconnect the AM/FM/XM antenna 3P connector [1][2]Antenna, Radio or the AM/FM antenna 3P connector Service and Repair.

8. Turn the ignition switch to ON (II).

9. Measure the voltage between AM/FM/XM antenna 3P connector or AM/FM antenna 3P connector terminal No. 1 and body ground.





Is there battery voltage?

YES -

Go to step 14.

NO -

Go to step 10.

10. Turn the ignition switch to LOCK (0).

11. Disconnect audio unit connector F (3P).

12. Check for continuity between audio unit connector F (3P) terminal No. 1 and AM/FM/XM antenna 3P connector or AM/FM antenna 3P connector terminal No. 1.





Is there continuity?

YES -

Go to step 13.

NO -

Repair an open in the wire between the audio unit and the AM/FM/XM antenna or the AM/FM antenna. Also check the AM/FM antenna sublead and/or the main lead and/or the rear lead connector.

13. Check for continuity between audio unit connector F (3P) 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/XM antenna or the AM/FM antenna.

NO -

Replace the audio unit:

- With navigation Audio Unit Removal/Installation (With Navigation).
- Without navigation Audio Unit Removal/Installation (Without Navigation).

14. Turn the ignition switch to LOCK (0).

15. Disconnect audio unit connector F (3P).

16. Check for continuity between audio unit connector F (3P) terminal No. 2 and AM/FM/XM antenna 3P connector or AM/FM antenna 3P connector terminal No. 2.





Is there continuity?

YES -

Go to step 17.

NO -

Replace the AM/FM antenna sublead and/or the main lead and/or the rear lead.

17. Check for continuity between audio unit connector F (3P) terminal No. 2 and body ground.





Is there continuity?

YES -

Replace the AM/FM antenna sublead and/or the main lead and/or the rear lead.

NO -

Go to step 18.

18. Check for continuity between audio unit connector F (3P) terminal No. 3 and AM/FM/XM antenna 3P connector or AM/FM antenna 3P connector terminal No. 3.





Is there continuity?

YES -

Go to step 19.

NO -

Replace the AM/FM antenna sublead and/or the main lead and/or the rear lead.

19. Check for continuity between audio unit connector F (3P) No. 2 and No. 3.





Is there continuity?

YES -

Replace the AM/FM antenna sublead and/or the main lead and/or the rear lead.

NO -

Replace the AM/FM/XM antenna [1][2]Antenna, Radio or the AM/FM antenna Service and Repair, and recheck. If the reception is still poor, replace the audio unit; with navigation Audio Unit Removal/Installation (With Navigation), without navigation Audio Unit Removal/Installation (Without Navigation).

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