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 radio generates the audible warning through the left front speaker. The radio receives audible warning requests via class 2 serial data from the body control module (BCM).

### 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

#### 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

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. Ignition ON, radio ON, adjust the radio balance and fade to the left front speaker.

⇒ | If the speaker does not operate properly, go to Speakers Inoperative - One or More .

3. If the speaker operates properly, replace the radio.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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