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 3A: SDM Option Configuration Error

### Circuit/System Description

The inflatable restraint sensing and diagnostic module (SDM) stores a primary data key, which is a 4-digit number, and a secondary data key, which is a portion of the vehicle identification number (VIN). When the ignition is turned ON, the SDM compares this information to the information stored in the body control module (BCM) over the serial data communication circuit. If there is a mismatch between the information stored in the SDM and BCM, DTC B1001 will set.

### Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

### Conditions for Setting the DTC

• | The 4-digit primary data key stored in the SDM does not match the 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 requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.

• | The SDM disables all deployments.

### Conditions for Clearing the DTC

• | The last 4-digit Primary Data Key in the SDM match the last 4 digits stored in the BCM.

• | The VIN that is stored in the SDM matches the VIN 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.

### Reference Information

#### Schematic Reference

SIR Schematics

#### Connector End View Reference

Component Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Important: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected.

• | SDM

• | SDM wiring harness

1. Ignition ON, verify the scan tool Secondary Key Status displays Valid.

⇒ | If not the specified value, verify the scan tool Received VIN Digits 2-7 match the vehicle VIN , if the VIN does not match, reprogram the BCM. If the VIN matches, reprogram the SDM.

2. Ignition ON, verify the scan tool Primary Key Status displays Valid.

⇒ | If not the specified value, verify the scan tool SDM Primary Key matches the Received Primary Key, if the key does not match, perform the Setup SDM Primary Key in BCM procedure.

3. With a scan tool, verify DTC B1001 is not set.

⇒ | If the DTC is set, replace the SDM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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