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

DEFINITION: The horn does not sound 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

2

Perform the following to activate the content theft deterrent (CTD) alarm mode:

  1. Open the driver window.
  2. Close all doors.
  3. Lock the vehicle and arm the CTD System using the power door locks or the keyless entry transmitter.
  4. Wait for the SECURITY indicator to go off (30 seconds).
  5. Keeping the key fob out of range of the vehicle, reach in and pull the manual release lever for the drivers door.
  6. 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

Go to Step 3

3

Are only the horns inoperative?

Go to Horns Inoperative

Go to Content Theft Deterrent (CTD) Alarm Mode Inoperative