Sensing and Diagnostic Module - SDM

DTC B1001 (Sensing and Diagnostic Module - SDM)

Diagnostic Instructions
• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
• Review Strategy Based Diagnosis for an overview of the diagnostic approach. Initial Inspection and Diagnostic Overview
• Diagnostic Procedure Instructions provides an overview of each diagnostic category. Initial Inspection and Diagnostic Overview

DTC Descriptor
DTC B1001 00: 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 [1][2]Air Bag Systems

Connector End View Reference
Component Connector End Views Connector Views

Description and Operation
SIR System Description and Operation Description and Operation

Electrical Information Reference
• Circuit Testing Circuit Testing
• Connector Repairs Connector Repairs
• Testing for Intermittent Conditions and Poor Connections. Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs Wiring Repairs
• SIR/SRS Wiring Repairs SIR/SRS Wiring Repairs

Scan Tool Reference
Control Module References for scan tool information. Control Module References

Circuit/System Testing

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 as current.
- If DTC is set as current, replace the SDM.

Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
Control Module References for SDM or BCM replacement, setup, and programming Control Module References