GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 Yukon - 2WD 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Content Theft Deterrent Malfunction

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.

Circuit/System Description

The content theft deterrent (CTD) system is a software based system in which the body control module (BCM) actively monitors certain inputs to determine if unauthorized vehicle access is being attempted. Based on inputs such as the door ajar switches, the rear compartment ajar switch, and the hood ajar switch, the BCM determines whether a CTD alarm is warranted. If unauthorized access is being detected, the BCM will pulse the vehicle horn and flash the turn signals as a means of theft deterrence.

Reference Information

Schematic Reference

Theft Deterrent System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Content Theft Deterrent (CTD) 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
  1. Ignition ON, vehicle in gear, individually open and close each vehicle door while observing the door ajar indicator/message. The indicator/message should accurately transition between the door ajar and door closed state when each door is opened and closed.
    2. ⇒If the door ajar indicator/message does not properly transition when each door is opened and closed, refer to Door Ajar Indicator Malfunction.
  2. Ignition ON, vehicle in PaRK, open and close the liftgate while observing the rear access indicator/message. The indicator/message should accurately transition between the rear access open and rear access closed state when the liftgate is opened and closed.
    3. ⇒If the indicator/message does not properly transition when the liftgate is opened and closed, refer to Liftgate Ajar Indicator Malfunction.
  3. Completely lower the driver door window and close all vehicle doors.
  4. Without disarming the system, reach in through the open driver window, unlock and open the driver door. Verify the scan tool CTD Status parameter displays Alarm Active.
    5. ⇒If the parameter does not equal the specified value, replace the BCM.
  5. With the door open, verify the vehicle horn is pulsing and the exterior lamps are flashing.
    6. ⇒If the horn is not pulsing, refer to Horns Malfunction.
    ⇒If the exterior lights are not flashing, refer to Turn Signal Lamps and/or Indicators Malfunction.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup and programming