GM Tech2 OBDⅡdiagnostic scanner has strong capacities that is possible to project multi programming functions, cruise control included.

But some users cannot/fail to enable cruise control settings with Tech2 scan tool. Take an example of a GM Tech2 owner, Here is how he did it:

1. Connect GM TechⅡdiagnostic tool to car via OBD port
2. Select Vehicle Control Systems, and navigate to Computer/Integrating Systems
3. Select Modules Replacement/Setup
4. Follow the system screen prompts, but he cannot see cruise control option

So he held a view that GM Tech2 scan tool is not possible to activate cruise control/ has no cruise control options.

But actually, GM tech 2 would make it work.

OBD365 here provides all GM Tech 2 OBD2 scanner cruise control options:

Cruise Control – Body > Instrument Panel Cluster > Special Functions > Input Tests
Cruise Control – Body > Instrument Panel Cluster > Special Functions > Lamp Test
Cruise Control – Body > Instrument Panel Cluster > Special Functions > Status Indicators Test Cruise Control – Body > Powertrain Interface Module > Special Functions > Output Controls Cruise Control – Powertrain > Special Functions > Engine Output Controls
Cruise Control Active – Body > Instrument Panel Cluster > Special Functions > Input Tests
Cruise Control Active – Body > Instrument Panel Cluster >Special Functions>Status Indicators Test
Cruise Control Cycle – Powertrain > Special Functions > Engine Output Controls > Cruise Control
Cruise Control Options – Powertrain > Special Functions > Option Reprogramming
Cruise Disable – Powertrain > Special Functions > Engine Output Controls
Cruise Enable – Powertrain > Special Functions (Natural Gas) > Engine Output Controls
Cruise Enable – Powertrain > Special Functions > Engine Output Controls

If you cannot find cruise control options, try another way around.
http://blog.obd365.com/2015/02/23/gm-tech%E2%85%A1tech-2-diagnostic-scan-tool-cruise-control-options/