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 radio generates the audible warning through the left speaker. The radio receives audible warning requests via the serial data circuit from the instrument panel cluster (IPC) or the body control module (BCM). The vehicle may be equipped with a chime module. The chime module receives audible warning requests via the serial data circuit. the chime producer is either the radio or the chime module.

### Reference Information

#### Schematic Reference

Audible Warnings Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Audible Warnings 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 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, headlamp switch OFF, verify the scan tool Headlamp Switch parameter is Inactive.

⇒ | If not Inactive, refer to Headlamps Malfunction.

2. Ignition ON, doors closed, verify the scan tool Door Ajar Switch parameter is Door Closed.

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

3. Verify that the Key In Ignition Cylinder Switch parameter is Key In when the key is in the ignition and Key Out when the key is out of the ignition.

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the key in 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 switch fuse is open, test the signal circuit terminal 4 for a short to ground.

3. Verify the BCM scan tool Key In Ignition Cylinder Switch parameter is Key Out.

⇒ | 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 BCM scan tool Key In Ignition Cylinder Switch parameter is Key In.

⇒ | 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