2005 GMC Envoy Owner's Manual - Page 123

OnStar® Steering Wheel Controls A steering wheel control can be used to interact with the OnStar® personal calling feature. Press the control with this symbol on the steering wheel to place a phone call. HomeLink® Wireless Control System When calling into voice mail systems, or to dial directory numbers, press the control, say the number(s), then say "dial." See the OnStar® user's guide for more information. HomeLink®, a combined universal transmitter and receiver, provides a way to replace up to three hand−held transmitters used to activate devices such as gate operators, garage door openers, entry door locks, security systems and home lighting. Additional HomeLink® information can be found on the Internet at www.homelink.com or by calling 1-800-355-3515. If your vehicle is equipped with the HomeLink® Transmitter, it complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. 2-49