Lights Inoperative in Content Theft Deterrent (CTD) Alarm Mode

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Step	Action	Yes	No
Schematic Reference: Theft Deterrent System Schematics DEFINITION: The vehicle lights do not flash when the content theft deterrent (CTD) system is in alarm mode.
1	Did you perform Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Perform one of the following to activate the content theft deterrent (CTD) alarm mode: Operate the PANIC button on the keyless entry transmitter. Complete the following steps: Open the driver window. Lock the vehicle using the power door lock switch. Close all of the doors and wait at least 30 seconds. Reach in and unlock the driver door manually. Open the driver door. Do all of the alarm mode functions activate-lights flash and horn pulses?	Go to Testing for Intermittent Conditions and Poor Connections	Go to Step 3
3	Are only the parking lamps inoperative?	Go to Park, License, and Tail Lamps Inoperative	Go to Content Theft Deterrent (CTD) Alarm Mode Inoperative