For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Theft Deterrent System Schematics
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 with the ignition OFF. OR

1. Open the driver's window.
2. Lock the vehicle using the power door locks or the keyless entry transmitters.
3. Close all doors.
4. Wait for the SECURITY indicator to go off (30 seconds).
5. Reach in and manually unlock the driver's door.
6. 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 headlights inoperative? | Go to Headlamps Inoperative - Low Beams in Lighting Systems | Go to Step 4
4 | Are only the perimeter lamps inoperative? | Go to Park Lamps Inoperative in Lighting Systems | Go to Content Theft Deterrent (CTD) Alarm Mode Inoperative