B2965

DTC B2965

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.

DTC Descriptor
DTC B2965
- Key In Ignition Circuit Open

Diagnostic Fault Information





Circuit Description

The body control module (BCM) monitors the key in ignition switch signal circuit. When the key is in the ignition, the ignition switch closes and the key in ignition switch signal circuit is pulled low. When the key is not in the ignition, the ignition switch opens 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 (Audible Warnings Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Audible Warnings Description and Operation (Audible Warnings Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) 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 key in ignition switch.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal listed below and ground:

* B+ Terminal 3 (LE5)
* B+ Terminal 2 (- LE5)

• 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 listed below for a short to ground.

* Signal Terminal 5 (LE5)
* Signal Terminal 4 (- LE5)

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

• If not the specified value, test the signal circuit terminal listed below for a short to voltage. If the circuit tests normal, replace the BCM.

* Signal Terminal 5 (LE5)
* Signal Terminal 4 (- LE5)

4. Install a 3-amp fused jumper wire between the key in ignition switch signal circuit terminal and the B+ circuit terminal terminal listed below. Verify the BCM scan tool Key In Ignition Cylinder Switch parameter is Key In.

* B+ Terminal 3 (LE5)
* B+ Terminal 2 (- LE5)
* Signal Terminal 5 (LE5)
* Signal Terminal 4 (- LE5)

• 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 (Verification Tests) after completing the diagnostic procedure.

* Ignition and Start Switch Replacement (Ignition and Start Switch Replacement)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming