Content Theft Deterrent Malfunction
Diagnostic Instructions
Circuit/System Description
The content theft deterrent system is a software based system in which the body control module (BCM) actively monitors certain inputs to determine if unauthorised vehicle access is being attempted. Based on inputs such as the door ajar switches, the rear compartment ajar switch, and the bonnet ajar switch, the BCM determines whether a content theft deterrent alarm is warranted. If unauthorised access is being detected, the BCM will pulse the vehicle horn and flash the indicators as a means of theft deterrence.
Diagnostic Aids
The scan tool BCM Content Theft Deterrent Trigger History 1, 2, and 3 parameters can be used to help isolate an intermittent unwanted content theft deterrent alarm. These parameters are a rolling history of the previous three causes of a theft deterrent alarm. If all three parameters are indicating the same alarm trigger, the indicated input should be the starting point when diagnosing an intermittent concern.
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
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, individually open and close each vehicle door, bonnet, and rear compartment while observing their respective ajar indicator/message. The indicator/message should accurately transition between the ajar and closed state when each access is opened and closed.
⇒ | If the indicator/message does not change |
| Refer to the appropriate symptom diagnostic below: |
⇓ | If each indicator/message changes |
- Completely lower the driver door window and close all vehicle doors.
- Ignition OFF, arm the content theft deterrent system by locking the door with the keyless entry transmitter. Verify the BCM scan tool Content Theft Deterrent Alarm Status parameter is Armed.
⇒ | If the parameter does not display Armed |
⇓ | If the parameter displays Armed |
- Without disarming the system, reach in through the open driver window and open the driver door. Verify the BCM scan tool Content Theft Deterrent Alarm Status parameter is Alarm.
⇒ | If the parameter does not display Alarm |
| Replace the K9 Body Control Module. |
⇓ | If the parameter displays Alarm |
- With the door open, verify the vehicle horn is pulsing and the exterior lamps are flashing.
⇒ | If the horn is not pulsing |
⇒ | If the exterior lights are not flashing |
⇓ | If the horn is pulsing and the exterior lamps are flashing |
- All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References - for BCM replacement, setup, and programming
© Copyright Chevrolet. All rights reserved |
© Copyright Chevrolet. All rights reserved |