GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2005 🢒 GMC Sierra Denali 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 Lights Inoperative in Content Theft Deterrent (CTD) Alarm Mode

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 the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

Perform one of the following to activate the CTD alarm mode:

    • Operate the PANIC button on the keyless entry transmitter.
    • Complete the following steps:
        1. Open the driver window.
        2. Lock the vehicle using the power door lock switch.
        3. Wait for the SECURITY telltale to turn off.
        4. Reach in and unlock the driver door.
        5. 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 in Wiring Systems

Go to Step 3

3

Are only the parking lamps inoperative?

Go to Park, License, and Tail Lamps Inoperative in Lighting Systems

Go to Content Theft Deterrent (CTD) Alarm Mode Inoperative