There is no such thing as a 'traction control sensor'.
But, If you are referring to the "Traction Control System", there are Many components that make up the Traction Control System.
The heart of Traction Control System is the "EBCM" (Electric Brake Control Module). The EBCM monitors the wheel speed sensors for Drive Wheel Slip. When drive wheel slip is noted while the brake is not applied, the EBCM will enter "Traction Control Mode".
When vehicle enters Traction Control Mode, the EBCM sends a request to the "PCM" (Power Control Module) to reduce the amount of torque to the drive wheels. If the engine torque reduction does not eliminate drive wheel slip, the EBCM will actively apply the drive wheel brakes.
The EBCM in the 05' Buick Terraza is located on the "BPMV" (Brake Pressure Modulator Valve). In other words, the EBCM is mounted on the Antilock Brake Controller.
Buick Terraza was created in 2005.
push button
This is most likely due to a blown fuse. Even if the brakes are good, a blown fuse will cause this symptom. If, after replacing the fuse, it blows again within a few weeks, additional maintenance may be required.
Take it to your Buick dealer is how.
The traction control feature is turned off.
Pull the bulb...
You can buy a Buick Terreza on the internet. Go to a second hand website or a car selling website and you can buy it there. Just a tip, look on Ebay. They have a lot of cars and things to sell and you can buy a Buick Terraza there.
Buick made ABS standard on all cars in 1992 i think, but don't hold me to that. :-D But I know for a fact that the 1999 Buick Century came with ABS standard. New to 1999 though was an optional traction control, and you can't have traction control without ABS.
Up above the radio controls along with your traction control button and others. Not by itself.
Powertrain Control Module (PCM)
These systems are called Traction Control or in your case Enhanced Traction System. It is either on or off. Yours is turned off, thus the off light.
Wear the seat belt as it was meant to be.