2005 GMC Envoy Owner's Manual - Page 275

The traction control off symbol on the button will come on under the following conditions: • The Traction Assist System is turned off, either by pressing the on/off button or by turning off the automatic engagement feature of the TAS. To turn the system on or off, press the TAS button located near the shift lever. If you used the button to turn the system off, the traction control off symbol on the button will come on and stay on. You can turn the system back on at any time by pressing the button again. The traction control off symbol on the button should go off. If desired, you can change the TAS automatic engagement feature so that the system will not come on automatically when the engine is started. To do so: 1. Turn the ignition to RUN. 2. Move the shift lever to NEUTRAL (N). 3. Apply the brake pedal and press the accelerator pedal to the floor. 4. Press and hold the TAS button for at least six seconds. 5. Release the TAS button and both pedals. 6. Start the engine and wait a few seconds. The next time you start your vehicle, the TAS will not automatically come on. You can restore the automatic feature by using the same procedure. Whether the TAS is set to come on automatically or not, you can always turn the system on or off by pressing the TAS button. • The transmission is in FIRST (1) gear; TAS will not operate in this gear. This is normal. • The vehicle is driven on an extremely rough road. When the vehicle leaves the rough surface, slows down or stops, the light will go off and TAS will be on again. This is normal. • A Traction Assist System, Anti-Lock Brake System or engine-related problem has been detected and the vehicle needs service. The Traction Assist System, as delivered from the factory, will automatically come on whenever you start your vehicle. To limit wheel spin, especially in slippery road conditions, you should always leave the system on. But you can turn the TAS off if you ever need to. You should turn the TAS off if your vehicle ever gets stuck in sand, mud or snow and rocking the vehicle is required. See Rocking Your Vehicle to Get It Out on page 4-43 and If Your Vehicle is Stuck in Sand, Mud, Ice or Snow on page 4-42 for more information. 4-9