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.

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Key In Ignition B+ | 1 | 1 | -- | --
Key In Ignition Signal | 1 | 1 | 1 | --
1. Chime Malfunction

### Circuit/System Description

The IPC generates the vehicle audible warning through an internal acoustic chime producer. The IPC receives audible warning requests via the serial data circuit from the body control module (BCM).

### Reference Information

#### Schematic Reference

• | Audible Warnings Schematics

• | Body Control System Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

• | Body Control System Description and Operation

• | Audible Warnings Description and Operation

• | Power Mode Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

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

1. Ignition ON, headlamp switch OFF, verify the scan tool Headlamp Switch ON parameter is Inactive.

⇒ | If not Inactive, refer to Headlamps Malfunction.

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

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

3. Ignition ON, close all doors, verify the scan tool Door Ajar Switch parameters are Door Closed.

⇒ | If not Door Closed, refer to Courtesy Lamps Malfunction.

4. Verify that the Ign. Off/Run/Crank parameter is Active when the key is in the ignition and Inactive when the key is out of the ignition.

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the ignition switch.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.

⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test the signal circuit terminal 4 for a short to ground.

3. Verify the scan tool Ign. Off/Run/Crank parameter is Inactive.

⇒ | If not the specified value, test the signal circuit terminal 4 for a short to voltage. If the circuit tests normal, replace the BCM.

4. Install a 3A fused jumper wire between the signal circuit terminal 4 and the B+ circuit terminal 2. Verify the scan tool Ign. Off/Run/Crank parameter is Active.

⇒ | If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the BCM.

5. If all circuits test normal, test or 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