Circuit/System Verification

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Before performing this diagnostics, make sure no indicator(s) are illuminated after the IPC performs the displays test. If any indicators are illuminated after the bulb test, perform the indicator diagnostics before this diagnostic.

Ignition ON, headlamp switch OFF, verify the scan tool Headlamp Switch ON parameter is Inactive.
- If not Inactive, refer to Headlamps Malfunction .
Ignition ON, park lamp switch OFF, verify the scan tool Park Lamp Switch parameter is Inactive.
- If not Inactive, refer to Park, License, and/or Tail Lamps Malfunction .
Ignition ON, doors closed, verify the scan tool Door Ajar Switch parameters are Inactive/Door Closed.
- If not Inactive/Door Closed, refer to Courtesy Lamps Malfunction (w/AN3) or Courtesy Lamps Malfunction (w/o AN3) .
Ignition ON, radio ON, adjust the radio balance and fade to the left front speaker.
- If the speaker does not operate properly, refer to Speaker Malfunction .
Verify that the Key In Ignition Status parameter is Key In when the key is in the ignition and Key Out when the key is out of the ignition.