GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Malibu 🢒 Body and Accessories 🢒 Instrument Panel, Gages, and Console 🢒 DTC B2965

Circuit Description

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

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC
    • The ignition 0 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 seconds.

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.
    • The BCM receives a clear code command from the scan tool.

Step

Action

Yes

No

Schematic Reference: Audible Warnings Schematics

1

Did you perform the Audible Warnings Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Audible Warnings

2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With the scan tool, observe the Key In Ignition parameter in the BCM Data list.

Does the Key In Ignition parameter display Yes?

Go to Step 3

Go to Step 4

3
  1. Turn OFF the ignition and remove key.
  2. Disconnect the BCM connector C2.
  3. Connect a test lamp between the ignition 0 voltage circuit and a good ground.

Does the test lamp illuminate?

Go to Step 6

Go to Step 8

4

Test the key in ignition switch signal circuit for an open, high resistance, or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 5

5

Test the ground circuit of the ignition key alarm switch for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 7

6

Test the ignition 0 voltage circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 7

7

Inspect for poor connections at the harness connector of the ignition switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 9

8

Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 10

9

Replace the ignition switch. Refer to Ignition and Start Switch Replacement .

Did you complete the replacement?

Go to Step 11

--

10

Important: Perform the set up procedure for the replacement BCM.

Replace the BCM. Refer to Body Control Module Replacement in Body Control System.

Did you complete the replacement?

Go to Step 11

--

11
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK