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

### Reference Information

#### Schematic Reference

• | Instrument Cluster Schematics

• | Audible Warnings Schematics

• | Radio/Navigation System Schematics

#### Connector End View Reference

• | Displays and Gages Connector End Views

• | Entertainment/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.

⇒ | If not Inactive, refer to Headlamps Malfunction .

2. Ignition ON, park lamp switch OFF, verify the scan tool Park Lamps Switch parameter is Inactive.

⇒ | If not Inactive refer to Park, License, and/or Tail Lamps Malfunction

3. Ignition ON, driver door closed, verify the scan tool Door Ajar parameter is Door Closed.

⇒ | If not On, refer to Door Ajar Indicator Malfunction .

4. Ignition OFF, key out of the ignition, verify the scan tool Key In Ignition Status parameter is Inactive.

⇒ | 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