For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Theft Deterrent System Schematics Connector End View Reference: Theft Deterrent System Connector End Views DEFINITION: The vehicle lights do not flash when the CTD system is in alarm mode.
1 | Did you perform A Diagnostic System Check - Theft Deterrent? | Go to Step 2 | Go to Diagnostic System Check - Theft Deterrent
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's window.

2. | Lock the vehicle using the power door lock switch.

3. | Close all of the doors and wait at least 30 seconds.

4. | Reach in and unlock the driver's door manually.

5. | Open the driver's 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 head lamps inoperative? | Go to Low and High Beams Headlamps Inoperative in Lighting Systems | Go to Content Theft Deterrent (CTD) Alarm Mode Inoperative