2010 Cadillac CTS Sedan AWD V6-3.6L Page 283

2010 Cadillac CTS Sedan AWD V6-3.6L Page 283

message via the serial data circuit to the instrument panel cluster (IPC) to illuminate the SECURITY indicator. After the VIN Timer has timed out,

the security indicator will turn OFF. If the VIN is INCORRECT, the TDM will send the fuel disable password to the engine control module (ECM),

via the serial data circuit. The immobilizer system considers this to be a tamper and will not allow the vehicle to start. The TDM will send a

message via the serial data circuit to the IPC to flash the SECURITY indicator.

Substitution detection is based on correct response from the following modules: instrument panel cluster (IPC), export body control module

(XBCM), driver door module (DDM), passenger door module (PDM). The modules compare their VIN to that stored in the VIN master on every

ignition ON cycle and report their status to the theft deterrent module.

Conditions for Running the DTC

Ignition ON

Conditions for Setting the DTC

* The VIN check flag of the TDM is true.

* The TDM has determined that the battery has been reconnected after a battery disconnect.

Action Taken When the DTC Sets

* The vehicle will not start.

* The TDM sends the fuel disable message via the serial data circuit to the ECM.

* The TDM will run the VIN Timer for a programmable length of time, typically 10 minutes.

* The TDM sends a message to the IPC to illuminate the SECURITY indicator.

Conditions for Clearing the DTC

The TDM clears the current DTC when the correct VIN information is present.

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 (without Y41) (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Description and

Operation/Immobilizer Description and Operation (Without Y41))Immobilizer Description and Operation (with Y41) (See: Accessories and

Optional Equipment/Antitheft and Alarm Systems/Description and Operation/Immobilizer Description and Operation (With Y41))

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. With a scan tool, verify the stored VIN in the BCM matches the actual vehicle VIN.

瀚慖f VIN does not match, perform the BCM Programming/RPO Configuration procedure. If the BCM VIN does not match the actual VIN

after programming, replace the BCM.

2. With a scan tool, verify the stored VIN in the following modules match the actual vehicle VIN:

* IPC

* XBCM

* DDM

* PDM

瀚慖f any modules stored VIN does not match the actual VIN perform the setup procedure for that module. If the stored VIN does not match

after setup, replace the module.