Content Theft Deterrent (CTD) Alarm Mode Inoperative

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 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 Connector End View Reference: Theft Deterrent System Connector End Views DEFINITION: The CTD system will not ARM or DISARM properly.
1	Did you perform A Diagnostic System Check - Theft Deterrent?	Go to Step 2	Go to Diagnostic System Check - Theft Deterrent
2	Open the driver's window. Unlock the doors using the power door lock switch or the keyless entry transmitter. Remove the keys from the ignition. Open the driver's door. Observe the courtesy lamps. Do the courtesy lamps illuminate?	Go to Step 3	Go to COURTESY LAMPS INOPERATIVE (WITHOUT RPO Y91) or COURTESY LAMPS INOPERATIVE (WITH RPO Y91)
3	Open the driver's window. Unlock the doors using the power door lock switch or the keyless entry transmitter. Remove the keys from the ignition. Open the driver's door. Observe the SECURITY telltale. Does the SECURITY telltale flash?	Go to Step 4	Go to Security Indicator Inoperative
4	Lock the vehicle using the power door lock switches or the keyless entry transmitter. Observe the SECURITY telltale. Does the SECURITY telltale change from flashing to on steady?	Go to Step 5	Go to POWER DOOR LOCKS INOPERATIVE - ALL DOORS AND SWITCHES
5	Close all of the doors. IMPORTANT: Ensure that all the doors are closed. The content theft deterrent system will not arm itself without all of the doors being closed. Observe the SECURITY telltale. Does the SECURITY telltale turn off in about 15 seconds?	Go to Step 6	Go to COURTESY LAMPS ALWAYS ON (WITHOUT RPO Y91) or COURTESY LAMPS ALWAYS ON (WITH RPO Y91)
6	Reach in and manually unlock the driver's door. Open the driver's door. Do all of the alarm mode functions activate, parking lights flash and horn pulses?	Go to Step 7	Go to Step 8
7	Disarm the CTD system by inserting the door key into the driver or the passenger door lock cylinder and rotate the key to the unlock position. Do all of the alarm mode functions stop?	Go to TESTING FOR INTERMITTENT AND POOR CONNECTIONS	Go to Content Theft Deterrent (CTD) Does Not Disarm with Key Lock
8	Do any of the alarm functions activate?	Go to Step 9	Go to COURTESY LAMPS INOPERATIVE (WITHOUT RPO Y91) or COURTESY LAMPS INOPERATIVE (WITH RPO Y91)
9	Do the horns pulse only?	Go to Lights Inoperative in Content Theft Deterrent (CTD) Alarm Mode	Go to Horn Inoperative in Content Theft Deterrent (CTD) Alarm Mode