PRE-RELEASE
DTC B3984
| DTC B3984 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptor |
DTC B3984 00
Device 1 Environment Identifier Not Programmable
| Circuit/System Description |
When certain modules are programmed and configured during installation, the module learns a specific environment identifier which is unique to the vehicle. The environment identifier is used to prevent the swapping modules between vehicles. The body control module (BCM) is the keeper of the environment identifier. The instrument cluster, electronic brake control module (EBCM), HVAC control module, sensing and diagnostic module (SDM), engine control module (ECM), and steering column lock control module, if equipped, each learn the environment identifier during their configuration process. During vehicle operation, each of these modules compare their environment identifier to that of the BCM. If the identifiers match, vehicle starting is allowed. If an environment identifier does not match, vehicle starting is disabled.
| Conditions for Running the DTC |
Ignition is in the ACCESSORY or RUN position.
| Conditions for Setting the DTC |
An incorrect environment identifier is programmed or no environment identifier is programmed.
| Action Taken When the DTC Sets |
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The security indicator in the instrument cluster will illuminate.
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Vehicle starting will be disabled.
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| Conditions for Clearing the DTC |
A current DTC will be cleared when the module learns a correct environment identifier.
| Reference Information |
Schematic Reference
Immobilizer Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Immobilizer Description and Operation
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Verification |
Perform the Programming and Setup procedure for the control module that set DTC B3902. Verify the DTC does not reset after programming.
| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for instrument cluster, EBCM, HVAC control module, SDM, ECM, or steering column lock control module replacement, setup, and programming
