2009 Hummer H3T Owner's Manual - Page 81

Features and Controls 5. After the engine has started, turn the key to LOCK/OFF, and remove the key. Insert the key to be programmed and turn it to ON/RUN within ten seconds of removing the previous key. The security light turns off once the key has been programmed. 6. Repeat the Steps 1 through 5 if additional keys are to be programmed. If the security light comes on and stays on while driving, the engine will restart if you turn it off. However, the theft-deterrent system is not working properly and must be serviced by your dealer/retailer. The vehicle is not protected by the theft-deterrent system at this time. In an emergency, contact Roadside Assistance. See Roadside Service on page 7-6. Do not leave the key or device that disarms or deactivates the theft deterrent system in the vehicle. 2-15 Starting and Operating Your Vehicle New Vehicle Break-In Notice: The vehicle does not need an elaborate break-in. But it will perform better in the long run if you follow these guidelines: • Avoid making hard stops for the first 200 miles (322 km) or so. During this time the new brake linings are not yet broken in. Hard stops with new linings can mean premature wear and earlier replacement. Follow this breaking-in guideline every time you get new brake linings. • Do not tow a trailer during break-in. See Towing a Trailer on page 4-42 for the trailer towing capabilities of the vehicle and more information. Following break-in, engine speed and load can be gradually increased. • Keep your speed at 55 mph (88 km/h) or less for the first 500 miles (805 km). • Do not drive at any one constant speed, fast or slow, for the first 500 miles (805 km). Do not make full-throttle starts. Avoid downshifting to brake or slow the vehicle.