GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Saturn 🢒 2005 🢒 ION 🢒 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 1 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 or the VIN information that is stored in the SDM does not match the VIN information that is stored in the BCM.

Action Taken When the DTC Sets
    • The SDM commands the AIR BAG indicator ON via Class 2 serial data.
    • The SDM disables all deployment loops.

Conditions for Clearing the DTC

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

Diagnostic Aids

DTC B1001 is an indication that the restraints IDs stored in both the BCM and SDM do not match or that the VINs stored in both the BCM and SDM do not match. If either the BCM and/or engine control module (ECM) were replaced, the replacement modules need to be reprogrammed for proper operation.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. Tests to see if the correct VIN is programmed in the ECM.

    2.

  2. Tests to see if the BCM has been replaced.

    3.

  3. Tests to see if the correct VIN is programmed in the BCM.

Step

Action

Yes

No

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. With a scan tool, verify that the engine control module (ECM) is programmed with the correct VIN by comparing the VIN that is stored in the ECM to the VIN plate of the vehicle.

Does the scan tool indicate that the ECM is programmed with the correct VIN?

Go to Step 4

Go to Step 3

3

Use a scan tool and/or the techline machine to program the correct VIN into the ECM.

Did you complete the action?

Go to Step 7

--

4

Was the body control module (BCM) replaced?

Go to Step 6

Go to Step 5

5

With a scan tool, verify that the BCM is programmed with the correct VIN by comparing the VIN that is stored in the BCM to the VIN that is stored in the ECM.

Does the scan tool indicate that the BCM is programmed with the correct VIN?

Go to Step 7

Go to Step 6

6

Follow the instructions on the scan tool under BCM SPECIAL FUNCTIONS to properly reprogram the BCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the action?

Go to Step 7

--

7
  1. Reconnect all SIR components.
  2. Use the scan tool in order to clear the DTCs.
  3. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 8

System OK

8

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 9

--

9
  1. Reconnect all SIR components.
  2. Use the scan tool in order to clear the DTCs.
  3. 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