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 radio generates the audible warning through the left speaker. The radio receives audible warning requests via the serial data circuit from the instrument panel cluster (IPC) or the body control module (BCM).

Reference Information

Schematic Reference

    •  Instrument Cluster Schematics
    •  Audible Warnings Schematics
    •  Body Control System Schematics

Connector End View Reference

    •  Displays and Gages Connector End Views
    •  Data Communication Connector End Views
    •  Inline Harness Connector End Views

Electrical Information Reference

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

Scan Tool Reference

Scan Tool Data List

Circuit/System Testing

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

  1. Ignition ON, headlamp switch OFF, verify the scan tool Headlamp Switch parameter is Inactive.
  2. If not Inactive, refer to Headlamp Low or High Beams Always On .
  3. Ignition ON, doors closed, verify the scan tool All Door Lock Command is On.
  4. If not On, refer to Courtesy Lamps Always On .
  5. Ignition OFF, key out of the ignition, verify the scan tool Key In Ignition Status parameter is Inactive.
  6. If not Inactive, test the key in ignition switch signal circuit for a short to ground. If the circuits tests normal, replace the ignition switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Ignition and Start Switch Replacement
    •  Control Module References for the BCM replacement, setup and programming