PRE-RELEASE
DTC B3935
| DTC B3935 |
| 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 B3935 00
Transponder Authentication Malfunction
| Circuit/System Description |
When an ignition key is inserted into the ignition lock cylinder and the ignition is switched ON, the transponder embedded in the key is energized by the exciter coils surrounding the ignition lock cylinder. The energized transponder transmits a signal that contains its unique value, which is received by the body control module (BCM). The BCM then compares this value to a value stored in memory. If the value is not correct, the BCM disables an engine start.
| Conditions for Running the DTC |
| • |
Ignition is in the Accessory or Run position.
|
|
| • |
A valid transponder value has been read.
|
|
| Conditions for Setting the DTC |
| • |
The transponder value is valid and matches the value stored in the BCM memory.
|
|
| • |
The transponder calculation of the challenge from the BCM does not match the BCM calculation.
|
|
| Action Taken When the DTC Sets |
| • |
Vehicle starting will be disabled.
|
|
| • |
The security indicator in the instrument cluster will be illuminated. The driver information center will display a service message.
|
|
| Conditions for Clearing the DTC |
| • |
A current DTC will be cleared when a valid transponder value has been read and authenticated.
|
|
| • |
A history DTC will be cleared after 100 malfunction-free ignition cycles or when a scan tool is used to clear DTCs.
|
|
| Reference Information |
Schematic Reference
Immobilizer Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Immobilizer Description and Operation
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 |
Change the key suspected to be faulty. DTC B3935 should not be reset and the car should start.
| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • |
Replacing Keys
|
|
| • |
Control Module References
for BCM replacement, programming, and setup
|
|
