2003 GMC Yukon Owner's Manual - Page 223

RIGHT REAR DOOR AJAR If the passenger's side rear door is not fully closed, this message will appear on the display and you will hear a chime. Stop and turn off the vehicle, check the door for obstacles, and close the door again. Check to see if the message still appears on the DIC. Press the select button to acknowledge the message and clear it from the DIC display. SERVICE TIRE MONITOR This message will be displayed if one or more of the tire monitor sensors have malfunctioned, or if all of the tire monitor sensors have not been programmed successfully. Press the select button or reset stem, to clear it from the display. The message will reappear at each ignition cycle until the system has been serviced. SERVICE STABILITY If you ever see the SERVICE STABILITY message, it means there may be a problem with your Stabilitrak® system. If you see this message try to reset the system (stop; turn off the engine; then start the engine again). If the SERVICE STABILITY message still comes on, it means there is a problem. You should see your dealer for service. The vehicle is safe to drive, however, you do not have the benefit of Stabilitrak®, so reduce your speed and drive accordingly. Press the select button to acknowledge the message and clear it from the DIC display. STABILITY SYS ACTIVE You may see the STABILITY SYS ACTIVE message on the DIC. It means that an advanced computer-controlled system has come on to help your vehicle continue to go in the direction in which you're steering. Stabilitrak® activates when the computer senses that your vehicle is just starting to spin, as it might if you hit a patch of ice or other slippery spot on the road. When the system activates, you may hear a noise or feel a vibration in the brake pedal. This is normal. When the STABILITY SYS ACTIVE message is on, you should continue to steer in the direction you want to go. The system is designed to help you in bad weather or other difficult driving situations by making the most of whatever road conditions will permit. 3-69