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 B0996 00: Vehicle Electronic Control Unit (ECU) VIN Check ErrorCircuit/System Description
The inflatable restraint sensing diagnostic module (SDM) and the body control module (BCM) are programmed with the vehicle identification number (VIN). When the ignition is in the RUN position the BCM requests the SDM to transmit the VIN via serial data and compares the VIN number stored in the SDM to that stored in the BCM. If the BCM identifies a mismatch this DTC will set.
Conditions for Running the DTC
System voltage is between 9-16 volts.
Conditions for Setting the DTC
| • | The VIN message received via the GMLAN does not match the VIN number stored in the SDM. |
| • | The incorrect SDM is installed on the vehicle. |
| • | The incorrect software or calibrations have been flash programmed into the SDM. |
Action Taken When the DTC Sets
DTC B0996 00 will set in the event of a VIN mismatch. There will be no indication to the driver unless the SDM is one of three modules that have a VIN mismatch fault. In the event of three modules failing to have the correct VIN stored the vehicle will fail to start.
Conditions for Clearing the DTC
| • | The condition for setting the DTC is no longer present. |
| • | A history DTC will clear once 250 malfunction-free ignition cycles have occurred. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
SIR System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, verify that DTC B0996 is not set.
| ⇒ | If the DTC is set, program the SDM. If the DTC resets, replace the SDM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for SDM replacement, setup, and programming
