DEFINITION: Use this diagnostic table in order to diagnose electro magnetic interference in the radio/audio system.

Were you sent here from the Radio/Audio System Check?

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Go to Step 2

Go to Radio/Audio System Check

1. Verify the customer's complaint.
2. Identify the concern.

Is the vehicle equipped with aftermarket items such as a radar detector, cellular telephone or 2-way radio?

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Go to Step 3

Go to Step 5

Remove each component one at a time and notice if the noises go away when a component has been removed.

Has the concern been identified with a component that has been removed?

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Go to Step 4

Go to Step 5

1. Verify that the installation procedures for each aftermarket item conforms to the auto manufacturer's installation guidelines.
2. Properly install each item if the item does not conform to the auto manufacturer's installation guidelines.

Has the original concern been corrected?

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Go to Radio/Audio System Check

Go to Step 5

1. Gather as much information on the concern as possible.
2. Check for related service bulletins which may deal with repairing this concern.

Is there a service bulletin available?

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Go to Step 6

Go to Step 7

Perform the service bulletin.

Has the concern been corrected?

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Go to Radio/Audio System Check

Go to Step 7

1. Check the integrity of the ignition and charging system.
2. Verify if the noises are there with the engine running, not running, or if the noises are intermittent or constant.

Has a concern with the ignition system or the charging system been found and corrected?

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Go to Radio/Audio System Check

Go to Step 8

1. Inspect all of the associated circuitry for the ignition and charging components.
2. Inspect the grounds, wiring and the harness connectors for possible electro magnetic interference.

Is there a concern with any of the grounds, wiring or the harness connectors?

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Go to Step 9

Go to Step 10

Repair the suspected ground, wire or harness connector.

Has the original concern been resolved?

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Go to Radio/Audio System Check

Go to Step 10

1. Inspect all of the associated circuitry for the radio/audio components.
2. Inspect the grounds, wiring and the harness connectors for possible electro magnetic interference.

Is there a concern with any of the grounds, wiring or the harness connectors?

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Go to Step 11

Go to Step 12

Repair the suspected ground, wire or harness connector.

Is the repair complete?

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Go to Radio/Audio System Check

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Contact the auto manufacturer's technical assistance center for further support.

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