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 B2961 : Key In Ignition Circuit

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Ignition Switch B+ | 1 | 1 | -- | --
Ignition Switch Signal | 1 | B2961 | B2961 | --
1. Chime Malfunction

### Circuit/System Description

The body control module (BCM) monitors the ignition switch. When the key is in the ignition, the ignition switch is closed and the signal circuit is low. When the key is not in the ignition, the ignition switch is open and the signal circuit is high.

### Conditions for Running the DTC

The ignition is ON.

### Conditions for Setting the DTC

• | The B+ voltage circuit is active and the ignition switch signal circuit is active and the signal circuit is high.

• | The above condition is present for greater than 5 seconds.

### Action Taken When the DTC Sets

The BCM stores DTC B2961 in memory.

### Conditions for Clearing the DTC

• | The DTC becomes history when the conditions for setting the DTC are no longer present.

• | The history DTC clears after 100 malfunction-free warm-up cycles.

### 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 Cylinder Switch parameter is Yes when the key is in the ignition and No 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 switch fuse is open, test the signal circuit terminal 5 for a short to ground.

3. Verify the BCM scan tool Key In Ignition Cylinder Switch 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 3-amp fused jumper wire between the signal circuit terminal 5 and the B+ circuit terminal 2. Verify the BCM scan tool Key In Ignition Cylinder Switch 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 BCM replacement, setup, and programming