Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

The radio generates the audible warning through the left front speaker. The radio receives audible warning requests via GMLAN serial data from the body control module (BCM).

Schematic Reference

Connector End View Reference

Electrical Information Reference

Scan Tool Reference

Scan Tool Data List

1. Ignition OFF, key in the ignition, open the driver door. The courtesy lamps should illuminate.

⇒	If the courtesy lamps do not illuminate, go to Courtesy Lamps Inoperative .

2. Ignition ON, radio ON, adjust the radio balance and fade to the left front speaker.

⇒	If the speaker does not operate properly, go to Speakers Inoperative - One or More .

3. If the speaker operates properly, replace the radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for radio replacement, setup, and programming