For 1990-2009 cars

### 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

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

2. 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