Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

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 lid 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 deterrent.

Schematic Reference

Theft Deterrent System Schematics

Description and Operation

Content Theft Deterrent (CTD) Description and Operation

Electrical Information Reference

Scan Tool Reference

1. Ignition ON, while opening and closing each vehicle door, verify that the applicable scan tool door ajar switch parameter cycles between Closed and Ajar.

⇒	If the scan tool parameter does not cycle between the specified values, refer to Door Ajar Indicator Malfunction .

2. With the rear compartment lid open, verify the GATE AJAR indicator is illuminated on the DIC.

⇒	If the message is not displayed, refer to Rear Hatch/Gate Ajar Indicator Inoperative .

3. With the rear compartment lid closed, verify the Gate AJAR indicator is not illuminated on the DIC.

⇒	If the message is displayed, refer to Rear Hatch/Gate Ajar Indicator Always On .

4. Completely lower the driver door window.
5. Ignition OFF, arm the CTD system using the keyless entry system by pressing the transmitter LOCK button twice. Verify the scan tool CTD Status parameter displays Armed.

⇒	If the parameter does not equal the specified value, refer to Keyless Entry System Inoperative .

6. 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.

⇒	If the parameter does not equal the specified value, replace the BCM.

7. With the door open, verify the vehicle horn is pulsing and the exterior lamps are flashing.

⇒	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 Inoperative .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup, and programming