Circuit/System Verification

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Ignition ON, while opening and closing each vehicle door, verify that the applicable scan tool door ajar switch parameter cycles between Inactive/Door Closed and Active/Door Ajar.
- If the scan tool parameter does not cycle between the specified values, refer to Door Ajar Indicator Malfunction (w/YE9) or Door Ajar Indicator Malfunction (w/o YE9) .
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 tool 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 the parameter does not equal 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 the parameter does not equal 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 (w/o VD1 or UHT) .
- If the exterior lights are not flashing, refer to Headlamps Inoperative - Low Beams (Standard) .