For 1990-2009 cars

### Circuit Description

The SIR SDM compares the vehicle restraint ID stored in the SDM and that stored in the IPM. The ID to be compared include 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 instrumental panel module over the serial data communication circuit. If there is a mismatch between the information stored in the SDM and IP module, DTC B1001 will set.

### DTC Descriptor

The diagnostic procedure supports the following DTC:

DTC B1001 SDM Option Configuration Error

The vehicle has DTCs including the DTC symptoms. Refer to DTC Symptom Description for DTC information.

DTC Symptom | DTC Symptom Descriptor
--- | ---
00 | Option configuration error

### Conditions for Running the DTC

Ignition 1 voltage is within normal operating 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 IPM.

• | The VIN stored in the IPM does not match that of the vehicle.

### Actions Taken When the DTC Sets

• | The SDM commands the AIR BAG indicator ON via GMLAN serial data communications.

• | The SDM disables all deployments.

### Conditions for Clearing the MIL/DTC

The last digits of the SDM part number match the last 4 digits stored in the IPM.

### Diagnostic Aids

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

### Test Description

The following numbers are corresponding to the steps in the diagnostic table.

1. This step tests if the VIN stored in the IPM is correct or not.

2. This step indicates reprogramming to the IPM is necessary.

3. This step checks if the DTC is the current one after it is cleared. If so, wrong SDM is installed.

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: SIR Schematics
1 | Have you conducted Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 | Important: J-45289 CANdi module must be used together with the scan tool.

1. Install the scan tool in order to display the SIR DTCs.
2. Engine off, ignition on.

Does the scan tool indicate DTC B1001 as current trouble code?

Go to Step 3

Go to Step 4

3 | Using the scan tool check the IPM that is programmed with the VIN. Verify that the IPM is programmed with the correct VIN number with the vehicle VIN plate. Is the IPM programmed with correct VIN? | Go to Step 5 | Go to Step 4
4 | Using the scan tool perform the Setup VIN into IPM. Refer to Control Module References for replacement, set up, and programming. Is the reprogramming completed? | Go to Step 5 | --
5 | Using the scan tool perform the Setup SDM Part Number into IPM procedure. Refer to Control Module References for replacement, set up, and programming. Is the reprogramming completed? | Go to Step 6 | --
6 |

1. Use the scan tool to check if DTC B1001 is set as current DTC.
2. Clear the DTC.
3. Engine off, ignition off and then on.

Does the scan tool indicate the DTC as current trouble code?

Go to Step 7

Go to Step 8

7 |

1. Turn the ignition switch to OFF position.
2. Replace the SDM module. Refer to Control Module References for replacement, set up, and programming.

Have you finished the replacement?

Go to Step 8

--

8 |

1. Reconnect all SIR components.
2. Verify all components, connectors and CPAs are correctly installed.
3. Clear away all DTCs with scan tool.
4. Engine off, ignition off and then on.
5. Operate the vehicle under conditions when DTC runs as specified in supporting documents.

Does the DTC set again?

Go to Step 2

System OK