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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1129 (Theft Deterrent System) >> Diagnostic Information and Procedures >> Content Theft Deterrent Malfunction (without RPO Y41) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. 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. Open and close the trunk while observing the trunk ajar indicator/message. The indicator/message should accurately transition between the trunk ajar and trunk closed state when the trunk is opened and closed.
  3. Insert the vehicle key into the driver door key cylinder and rotate the cylinder between the lock and unlock positions. Verify the scan tool Door Key Cyl. Unlock Switch parameter cycles between Idle/Inactive and Unlock/Active.
  4. Completely lower the driver door window and close all vehicle doors.
  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.
  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.
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