GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2007 🢒 Sierra Classic - 4WD 🢒 Safety and Security 🢒 Supplemental Inflatable Restraints 🢒 DTC B2961

Circuit Description

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

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B2961 Key in Ignition Circuit

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC
    • The ignition 1 input is active and the key in ignition switch signal circuit is inactive and the signal circuit is high.
    • The above conditions must be present for more 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 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.

Step

Action

Yes

No

Schematic Reference: Audible Warnings Schematics

Connector End View Reference: Displays and Gages Connector End Views or Body Control System Schematics

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

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

Does the Key In Ignition parameter display Yes?

Go to Step 3

Go to Step 4

3
  1. Turn the ignition ON, with the engine OFF.
  2. Observe the Battery Voltage parameter in the BCM Data data list.
  3. Turn the ignition OFF.

Does the Battery Voltage parameter display Active with the ignition off?

Go to Step 8

Go to Step 7

4

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

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 .

Did you find and correct the condition?

Go to Step 11

Go to Step 6

6

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

Did you find and correct the condition?

Go to Step 11

Go to Step 9

7

Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 10

8

Repair the short to voltage in the ignition 1 voltage circuit. Refer to Wiring Repairs .

Did you correct the condition?

Go to Step 11

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9

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

Did you complete the replacement?

Go to Step 11

--

10

Replace the BCM. Refer to Control Module References for replacement, setup, and programming.

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