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

Circuit Description

The inflatable restraint sensing and diagnostic module (SDM) stores the vehicles restraint ID from the vehicle identification number (VIN) and the last 4 digits of the SDM part number. When the ignition is turned ON, the SDM compares this information to the information stored in the body control module (BCM) over the GMLAN communication circuit. If there is a mismatch between the information stored in the SDM and BCM, DTC B1001 will set.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B1001 SDM Option Configuration Error

DTC Symptom

DTC Symptom Descriptor

00

Option Configuration Error

Conditions for Running the DTC

Ignition voltage is within the normal operating voltage range.

Conditions for Setting the DTC

B1001 00

    • The last 4 digits of the SDM part number does not match the last 4 digits stored in the BCM.
    • The VIN stored in the BCM does not match that of the vehicle.

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

Conditions for Clearing the MIL/DTC
    • The last 4 digits of the SDM part number match the last 4 digits stored in the BCM.
    •  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 replaced without reprogramming the BCM with the new information.

Test Description

The numbers below refer to the step numbers on 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 have the correct VIN.

    4.

  4. This test checks to see if after clearing the DTCs, this DTC is current.

Step

Action

Yes

No

Schematic Reference: SIR Schematics

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

    Important: The EL-39021-460 CANdi module must be used with the scan tool.

  1. Install a scan tool, request the SIR DTC display.
  2. Turn ON the ignition, with the engine OFF.

Does the scan tool indicate that DTC B1001 is current?

Go to Step 3

Go to Step 10

3

With the scan tool, verify that the body control module (BCM) is programmed with the correct vehicle identification number (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 Body Control Module (BCM) Programming/RPO Configuration .

Did you complete the reprogramming procedure?

Go to Step 5

--

5

Using the scan tool, perform the Setup SDM Part Number into BCM. Refer to Control Module References for replacement, setup, and programming.

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 10

7

Using the scan tool, perform the complete BCM reprogramming procedure. Refer to Control Module References for replacement, setup, and programming.

Did you complete the reprogramming procedure?

Go to Step 8

--

8
  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 9

Go to Step 10

9

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

Did you complete the replacement?

Go to Step 10

--

10
  1. Reconnect all SIR components.
  2. Verify that all components, connectors, and connector position assurances (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