AM and FM radio reception is dependent on the following components:

Poor AM and FM radio reception is dependent on multiple influences, some of which may not be vehicle related. Areas which have high RF traffic or block the signal path may cause a degradation in radio reception. Radio reception may also be influenced by items within the vehicle, but not part of the radio system. Such examples are aftermarket electrical accessories or other items which may generated noise in the vehicle electrical system.

Schematic Reference

Radio/Navigation System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Radio/Audio System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Inspect the antenna for proper mounting or physical damage.

⇒	If damage is found, repair or replace as necessary

2. Radio ON, tune to several known FM, AM, and XM (if equipped) stations, and play a known good CD.

⇒	If audio output is poor from all sources, refer to Speaker Malfunction.

1. Ignition OFF, disconnect the coax cable from the radio and radio antenna.
2. Verify the coax connectors are properly secured and free of any damage.

⇒	If damage is found, repair or replace as necessary.

3. Test for infinite resistance between the antenna coax center terminal and ground.

⇒	If less than the specified value, replace the antenna coax.

4. Test for less than 5 ohms on the antenna coax center terminal from end to end.

⇒	If greater than the specified range, replace the antenna coax.

5. Test for less than 5 ohms on the antenna coax outer shield from end to end.

⇒	If greater than the specified range, replace the antenna coax.

6. Test for infinite resistance between the coax center terminal and the outer shield.

⇒	If less than the specified value, replace the antenna coax.

7. If all circuits test normal, replace the antenna.
8. Ignition ON, radio ON, verify radio reception has improved.

⇒	If there is still poor reception, replace the radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.