For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptor

DTC B1001: SDM Option Configuration Error

### Circuit/System Description

When the ignition is first turned ON, the inflatable restraint sensing and diagnostic module (SDM) compares the restraints ID stored in the SDM to the restraints ID stored in the body control module (BCM). The restraints ID being compared contains the last four digits of the SDM part number. The SDM then compares the vehicle identification number (VIN) stored in the SDM to the VIN stored in the BCM.

### Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

### Conditions for Setting the DTC

The restraints ID stored in the SDM does not match the restraints ID stored in the BCM, or the VIN information stored in the SDM does not match the VIN information stored in the BCM.

### Action Taken When the DTC Sets

• | The SDM commands ON the AIR BAG warning lamp via class 2 serial data.

• | The SDM disables all AIR BAG deployments.

### Conditions for Clearing the DTC

• | You issue a scan tool CLEAR DTCs command.

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

### Diagnostic Aids

DTC B1001 is an indication that the restraint 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 the BCM was replaced, the replacement module will have to be reprogrammed for proper operation.

### Reference Information

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

### Circuit/System Testing

1. Ignition ON, use the scan tool to request SIR DTCs. Verify that DTC B1001 is set as current.

⇒ | If DTC B1001 is history, clear codes and recheck.

2. Using the scan tool check the BCM that is programmed with the VIN. Verify that the BCM is programmed with the correct VIN number with the vehicle VIN plate.

⇒ | If the BCM has the wrong VIN number, refer to BCM in Repair Instructions for programming.

3. Using the scan tool perform the Setup SDM Part Number into BCM procedure.
4. Ignition ON use the scan tool to clear the DTCs. Verify that DTC B1001 is cleared.

⇒ | If DTC B1001 was current replace the SDM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | SIR/SRS Wiring Repairs

• | Control Module References for SDM and BCM replacement, setup, and programming