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

Does the scan tool communicate with the vehicle?

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Go to Step 2

Diagnostic System Check - Data Link Communications in Wiring Systems

Establish communication with the radio (IRC).

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

Request the scan tool to display radio DTCs.

Are any radio DTC's stored?

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Go to Diagnostic Trouble Code (DTC) List/Type

Go to Radio/Audio System Check