Spark

Radio Poor Reception

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. Aftermarket window tinting, especially when there is a metallic in the film, may reduce radio reception.

For the Diversity aerial system, reception is highly dependent on the aerial module receiving battery voltage from the radio. The aerial module has a built in aerial amplifier that boosts both AM and FM reception. The aerial module will switch between the internal and external aerial for best reception and provide feedback of this signal through the coax cable that connects the radio to the aerial module.

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

1. Ignition OFF, disconnect the radio aerial coax cable from the radio and the radio aerial.
2. Test for infinite resistance between the aerial coax centre terminal and ground.

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

3. Test for less than 10 Ω on the aerial coax centre terminal from end to end.

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

4. Test for less than 10 Ω on the aerial coax outer shield from end to end.

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

5. Test for infinite resistance between the coax centre terminal and the outer shield.

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

6. Reconnect the coax to the radio aerial. Test for infinite resistance on the coax at the radio between the centre terminal and the outer shield.

⇒	If less then specified value, replace the aerial.

7. Test for less than 10 Ω on the coax at the radio between the outer shield and ground.

⇒	If greater than specified value, clean the mounting surface of the aerial ground plane. If no corrosion found, replace the aerial.

8. If all circuits test normal, replace the radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Radio Aerial Base Replacement