1. Connect a scan tool to the data link connector (DLC).
2. Turn the ignition switch to the RUN position.
3. Establish communications with the vehicle.

Does the scan tool communicate with the vehicle?

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Go to Step 2

Go to Scan Tool Does Not Communicate with Class 2 Data Line in Data Link Communications

Establish communications with the radio.

Does the scan tool communicate with the radio?

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Go to Step 3

Go to Radio Display Inoperative, No Sound from Speakers

Display the radio DTCs.

Are their any radio DTCs current?

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Go to Diagnostic Trouble Code (DTC) List/Type

Go to Radio/Audio System Check