GM Service Manual Online
For 1990-2009 cars only

Diagnostic Instructions

    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Description

The body control module (BCM) generates the audible warning. The BCM receives audible warning requests via serial data.

Reference Information

Schematic Reference

    •  Instrument Cluster Schematics
    •  Radio/Navigation System Schematics

Connector End View Reference

    •  Displays and Gages Connector End Views
    •  Entertainment/Communication Connector End Views

Description and Operation

    •  Instrument Cluster Description and Operation
    •  Body Control System Description and Operation
    •  Radio/Audio System Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

    •  Scan Tool Output Controls
    •  Scan Tool Data List
    •  Scan Tool Data Definitions

Circuit/System Testing

  1. Ignition OFF, key in the ignition, open the driver door. The courtesy lamps should illuminate
  2. If the courtesy lamps do not illuminate, go to Courtesy Lamps Inoperative .
  3. If all circuits test normal, replace the BCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for the BCM replacement, setup, and programming