Circuit/System Verification

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.
- If the door ajar indicator/message does not properly transition when each door is opened and closed, refer to Door Ajar Indicator Malfunction .
Open and close the liftgate while observing the liftgate ajar indicator/message. The indicator/message should accurately transition between the lift gate ajar and liftgate closed state when the trunk is opened and closed.
- If the liftgate ajar indicator/message does not properly transition when the liftgate is opened and closed, refer to Liftgate Ajar Indicator Malfunction .
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 and Unlock.
- If the scan too parameter does not cycle between the specified parameters, refer to Content Theft Deterrent (CTD) Does Not Disarm with Key Lock .
Completely lower the driver door window and close all vehicle doors.
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 not the specified value, refer to Keyless Entry System Inoperative .
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 not the specified value, replace the BCM.
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 Headlamps Malfunction .