GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Theft Deterrent System Schematics

Connector End View Reference: Theft Deterrent System Connector End Views

1

Did you perform the Theft Deterrent Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Theft Deterrent

2

Perform the following to activate the CTD Alarm Mode:

  1. Open the drivers window.
  2. Lock the vehicle using the power door locks or the keyless entry transmitter.
  3. Close all doors.
  4. Wait for the SECURITY indicator to go off in approximately 30 seconds.
  5. Reach in and manually unlock the driver's door.
  6. Open the drivers 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 horns inoperative?

Go to Horns Inoperative in Horns

Go to Content Theft Deterrent (CTD) Alarm Mode Inoperative