GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2005 🢒 LaCrosse 🢒 Restraints 🢒 SIR 🢒 DTC B1001

Circuit Description

When the ignition is turned ON the inflatable restraint sensing and diagnostic module (SDM) compares the restraint ID that is stored in the SDM to the restraints ID that is stored in the body control module (BCM). The restraints ID that is being compared to contains the last four digits of SDM part number. The SDM receives these messages and compares them to information stored in memory, this DTC is set when the SDM receives a restraints ID over the class 2 communication circuit from the BCM that is different from the ID that is stored in the SDM memory.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B1001 Option Configuration Error

Conditions for Running the DTC

Ignition voltage is within the normal operating voltage range.

Conditions for Setting the DTC
    • The restraints ID that is stored in the SDM does not match the restraints ID that is stored in the BCM.
    • This test is only run once during power initialization.

Action Taken When the DTC Sets
    • The SDM commands ON the AIR BAG warning lamp via class 2 serial data.
    • The SDM disables all deployments.

Conditions for Clearing the DTC

The restraints ID that is stored in the SDM matches the restraints ID that is stored in the BCM.

Diagnostic Aids

This DTC is an indication that an incorrect SDM is installed in the vehicle, or that the SDM and/or the BCM was replace without reprogramming the BCM with the new information.

Test Description

The following numbers refer to the step numbers in the diagnostic table:

  1. This test checks for current SDM DTCs.

    2.

  2. This test checks to see if the correct VIN is programmed in the BCM.

    3.

  3. This step explains that the BCM must be programmed.

    4.

  4. This test checks to see if after clearing the DTCs if this DTC is current then its possible that the wrong SDM has been installed.

Step

Action

Yes

No

Schematic Reference: SIR Schematics

Connector End View Reference: SIR Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

  1. Turn OFF the ignition.
  2. Use the scan tool to request SIR DTCs displayed.
  3. Turn ON the ignition, with the engine OFF.

Does the scan tool indicate that this DTC is current?

Go to Step 3

Go to Step 8

3

With the scan tool, verify that the body control module (BCM) is programmed with the correct vehicle information numbers (VIN) that is stored in the BCM to the VIN plate of the vehicle.

Is the BCM programmed with the correct VIN?

Go to Step 5

Go to Step 4

4

Use the scan tool to program the correct VIN into the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the reprogramming procedure?

Go to Step 5

--

5

Use the scan tool to perform the setup SDM part number in BCM procedure under SIR special functions.

Did you complete the reprogramming procedure?

Go to Step 6

--

6

  1. Use the scan tool to check to see if DTC B1001 is current.
  2. Clear the DTCs.
  3. Turn OFF the ignition then turn ON the ignition, with the engine OFF.

Does the scan tool indicate that this DTC is current?

Go to Step 7

Go to Step 8

7

Replace the inflatable restraint sensing and diagnostic module (SDM). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 8

--

8
  1. Reconnect all SIR components.
  2. Verify that all components, connectors and CPAs are properly mounted.
  3. Use the scan tool in order to Clear the DTCs.
  4. Turn OFF the ignition then turn ON the ignition, with the engine OFF.
  5. Operate the vehicle within the Conditions for Running the DTC as specified in the text.

Does the DTC reset?

Go to Step 2

System OK