GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2001 🢒 Sonoma Pickup - 2WD 🢒 Body and Accessories 🢒 Theft Deterrent 🢒 Content Theft Deterrent (CTD) Alarm Mode Inoperative

Step

Action

Yes

No

Schematic Reference: Theft Deterrent System Schematics

Connector End View Reference: Theft Deterrent System Connector End Views

DEFINITION: The CTD system will not ARM or DISARM properly.

1

Did you perform A Diagnostic System Check - Theft Deterrent?

Go to Step 2

Go to Diagnostic System Check - Theft Deterrent

2
  1. Open the driver's window.
  2. Unlock the doors using the power door lock switch or the keyless entry transmitter.
  3. Remove the keys from the ignition.
  4. Open the driver's door.
  5. Observe the courtesy lamps.

Do the courtesy lamps illuminate?

Go to Step 3

Go to Courtesy Lamps Inoperative in Lighting Systems

3
  1. Open the driver's window.
  2. Unlock the doors using the power door lock switch or the keyless entry transmitter.
  3. Remove the keys from the ignition.
  4. Open the driver's door.
  5. Observe the SECURITY telltale.

Does the SECURITY telltale flash?

Go to Step 4

Go to Security Indicator Inoperative

4
  1. Lock the vehicle using the power door lock switches or the keyless entry transmitter.
  2. Observe the SECURITY telltale.

Does the SECURITY telltale change from flashing to on steady?

Go to Step 5

Go to Power Door Locks Inoperative - All Doors and Switches in Doors

5
  1. Close all of the doors.

    2. Important: Ensure that all the doors are closed. The content theft deterrent system will not arm itself without all of the doors being closed.

  2. Observe the SECURITY telltale.

Does the SECURITY telltale turn off in about 15 seconds?

Go to Step 6

Go to Courtesy Lamps Always On in Lighting Systems

6
  1. Reach in and manually unlock the driver's door.
  2. Open the driver's door.

Do all of the alarm mode functions activate, parking lights flash and horn pulses?

Go to Step 7

Go to Step 8

7

Disarm the CTD system by inserting the door key into the driver or the passenger door lock cylinder and rotate the key to the unlock position.

Do all of the alarm mode functions stop?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Content Theft Deterrent (CTD) Does Not Disarm with Key Lock

8

Do any of the alarm functions activate?

Go to Step 9

Go to Courtesy Lamps Inoperative in Lighting Systems

9

Do the horns pulse only?

Go to Lights Inoperative in Content Theft Deterrent (CTD) Alarm Mode

Go to Horn Inoperative in Content Theft Deterrent (CTD) Alarm Mode