GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2004 🢒 Rendezvous - FWD 🢒 DTC 🢒 DTC 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, if equipped
    • Audible Warnings
    • Automatic Door Locks

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.

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 Body Control Module data list.

Does the Key In Ignition parameter display Active?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3
  1. Turn OFF the ignition.
  2. Disconnect the BCM connector C0.
  3. Connect a test lamp between the key in ignition input circuit and battery positive voltage.
  4. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 7

Go to Step 4

4

Test the key in ignition input circuit for an open, for a high resistance, or 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 10

Go to Step 5

5

Test the ground circuit of the key in ignition 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 10

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 in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 8

7

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 10

Go to Step 9

8

Replace the ignition switch. Refer to Ignition and Start Switch Replacement in Steering Wheel and Column.

Did you complete the replacement?

Go to Step 10

--

9

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 10

--

10
  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