2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 375
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.
Conditions for Running the DTC
Ignition voltage is between 9-16 V.
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 is not in the acceptable range of VINs allowed by the SDM calibration.
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 stored in the BCM is in the acceptable range of VINs allowed by the SDM calibration.
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 (See: Diagrams/Electrical Diagrams/Air Bag Systems)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
SIR System Description and Operation (See: Restraints and Safety Systems/Air Bag Systems/Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
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 Primary Key Status displays Valid.
瀚慖f 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.
