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.

### DTC Descriptor

DTC B2965: Key In Ignition Circuit Open

### 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 | B2965 | B2965 | --
1. Chime Malfunction.

### Circuit Description

The body control module (BCM) monitors the key in ignition switch signal circuit in order to activate an audible warning.The ignition switch closes when the key is in the ignition and the signal circuit is low. The ignition switch opens when the key is not in the ignition and the signal circuit is high.

### Conditions for Running the DTC

The ignition is ON.

### Conditions for Setting the DTC

• | The ignition 1 voltage circuit is active high signal and the key in ignition signal circuit is high.

• | The conditions above must be present for more than 0.3 second.

### Action Taken When the DTC Sets

The BCM stores DTC B2965 in memory.

### Conditions for Clearing the DTC

• | The DTC becomes history when the fault is no longer present.

• | A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.

### 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

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, verify that a test lamp illuminates between the B+ circuit terminal 3 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 power mode circuit fuse is open, test the signal circuit terminal 3 for a short to ground.

3. Verify the scan tool Key In Ignition Status parameter is Key Out.

⇒ | 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 B+ circuit terminal 3. Verify the scan tool Key in Ignition Status 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 BCM replacement, setup, and programming