Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, key in the ignition, open the driver door. The courtesy lamps should illuminate.
- If the courtesy lamps do not illuminate, refer to Courtesy Lamps Inoperative .
Ignition ON, radio ON, adjust the radio balance and fade to the left front speaker.
- If the speaker does not operate properly, refer to Speakers Inoperative - One or More (With Amplifier) or Speakers Inoperative - One or More (Without Amplifier) .
If the speaker operates properly, replace the BCM.