For 1990-2009 cars only
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 CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Key In Ignition Alarm Switch Signal Circuit | -- | B2961 | -- | -- |
Circuit Description
The body control module (BCM) uses a key in ignition input in order to control certain features in the vehicle. These features are in the following systems:
| • | Content theft deterrent (CTD), if equipped |
| • | Audible warnings |
| • | Automatic door locks (ADL) |
The ignition switch switches the key in ignition input circuit to ground when you fully insert the ignition key into the ignition switch. This in turn pulls the BCM key in ignition input low.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
| • | The ignition 0 input is active, high signal and the key in ignition input is inactive, high signal. |
| • | The conditions above must be present for more than 0.3 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 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. |
| • | The BCM receives the clear code command from the scan tool. |
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the ignition key alarm switch.
- Ignition OFF, test for less than 1.0 ohm of resistance between the ground circuit and ground.
- Ignition ON, install a 3-amp fused jumper between the signal circuit and ground. Verify the scan tool Key In Ignition parameter displays Active.
- If all circuits test normal, test or replace the ignition switch.
| ⇒ | If greater than 1.0 ohm test the ground circuit for an open/high resistance. |
| ⇒ | If not Active, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
