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make sure 3rd brake light works, most likely you have a code in the EBCM (antilock brakes), some codes disable the cruise control, possible vehicle or output speed sensor or wheel speed sensor.
It's usually the sensor inside the wheel hub or the wiring harness to the brake controller. The service traction light will set a trouble code. If your mechanic is stumped, authorize him to call a GM tech support line. The call is $50, but the GM tech support can help him figure out what's wrong.
without having it put on a computer to tell me the exact code, there could be a possibility that the shop that replaced your rear tires disabled the sensor in the rear wheels and never reactivated it. Something you might want to go back to the shop and have them look at. Could be as simple as rehooking up wires to a sensor. Hope this helps.
With Cadillac, the traction control is on by default. there is no indication that it is on. You can disable it and notice comes up from that, but otherwise it is on.
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