For 1990-2009 cars

# Body and Accessories

## All Component Locator

- Theft Deterrent System Components

## All Description and Operation

- Content Theft Deterrent (CTD) Circuit Description
- Content Theft Deterrent (CTD) Operation
- Vehicle Theft Deterrent (VTD) Operation

## All Visual Identification

- Theft Deterrent System Connector End Views

## Cleaning, Inspection, and Adjustment

- Programming Additional Keys
- Programming Replacement Keys, Ignition Cylinder, or Engine Control Module

## Diagnostic Procedures

- Content Theft Deterrent (CTD) Alarm Mode Inoperative
- Content Theft Deterrent (CTD) Armed When Unlocked From Switch
- Content Theft Deterrent (CTD) System Check
- Diagnostic System Check - Theft Deterrent
- SECURITY Indicator Always On or Flashing
- SECURITY Indicator Inoperative

## Diagnostic Trouble Codes

- DTC 11 Transponder Key Problem
- DTC 12 Wrong Transponder Key
- DTC 13 Immobilizer Not Programmed
- DTC 14 No Transponder Key Programmed
- DTC 15 Vehicle Speed Signal Voltage Low
- DTC 16 Vehicle Speed Signal Voltage High
- DTC 17 No Engine Request Received
- DTC 18 MIL Circuit
- DTC 55 Theft Deterrent Module Malfunction

## Electrical/Electronic Schematic Diagrams

- Theft Deterrent System Schematic Icons
- Theft Deterrent System Schematic References
- Theft Deterrent System Schematics

## General Diagnostic Information

- Diagnostic Trouble Code (DTC) List/Type

## Other Specifications

- GM SPO Group Numbers

## Removal, Installation, and Replacement

- Theft Deterrent Module Replacement