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 audible warnings through the left speaker. The radio receives audible warning requests via the serial data circuit from 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 indicators 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, radio ON, adjust the radio balance and fade to the left front speaker.

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

2. Ignition ON, verify that the scan tool Key In Ignition Status parameter is Key In.

⇒ | If not Key In, test the signal circuit and ground for a short to voltage or an open/high resistance. If all circuits test 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 IPC replacement, setup, and programming.