2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 711
- No Transponder Modulation or No Transponder
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 head of 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 theft deterrent module (TDM). The TDM then compares this value to a value stored in memory. This stored value is the
learned key code. If the value is correct, the TDM will send the prerelease password via the serial data circuit to the engine control module (ECM).
If the learned key code does not match or a transponder value is not received, the TDM will send the start disable password to the ECM.
Conditions for Running the DTC
Ignition is in the Accessory or Run position.
Conditions for Setting the DTC
The TDM is unable to measure the ignition key transponder value.
Action Taken When the DTC Sets
* Vehicle starting will be disabled.
* The security indicator will be illuminated.
Conditions for Clearing the DTC
* A current DTC will be cleared when the TDM detects a valid transponder value from the ignition key.
* 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 (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Diagrams/Electrical Diagrams/Immobilizer
Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Immobilizer Description and Operation (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Description and
Operation/Immobilizer 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 Verification
Important: When using this diagnostic, more than one vehicle key is required to ensure proper diagnosis. If more than one key is not
available at the time of service, contact the customer and ask if any other keys can be provided for service. If unavailable, a new second
key can be created.
1. Inspect all available vehicle keys that they are correct vehicle keys.
瀚慖f not a correct vehicle key, replace the key.
2. While viewing the scan tool TDM Transponder Key parameter, turn ON the ignition with each of the available vehicle keys. The parameter
should read Present with all available keys.
瀚慖f only one key results in the parameter reading Not Present, replace the appropriate key.
瀚慖f all available keys result in the parameter reading Not Present, replace the TDM.
