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 5V reference | 1 | 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).

### 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, 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, doors closed, verify the scan tool All Door Lock Command is On.

⇒ | If not On, refer to Courtesy Lamps Malfunction.

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

⇒ | If the speaker does not operate properly, refer to Speaker Malfunction.

5. Verify that the Key In Ignition Status 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 ignition switch.
2. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 6 and ground.

⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

⇒ | If more than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the BCM.

3. Verify the scan tool Key In Ignition Status parameter is No.

⇒ | If not the specified value, test the signal circuit terminal 5 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 5 and the 5-volt reference circuit terminal 6. Verify the scan tool Key in Ignition Status parameter is Yes.

⇒ | 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