2003 GMC Envoy Owner's Manual - Page 366

Secondary Latch System Your vehicle has an underbody mounted tire hoist assembly equipped with a secondary latch system. It's designed to stop the spare or flat road tire from suddenly falling off your vehicle if the cable holding the spare tire is damaged. For the secondary latch to work, the spare tire must be stored with the valve stem pointing up. See "Storing a Flat or Spare Tire and Tools" for instructions on storing the spare tire correctly. Someone standing too dose during the procedure could be injured by the jack. If the spare tire does not slideoff the jack completely, make sure no one is behind you or on either side of you as you pull the jack out from the spare. To release the spare tire from the secondary latch do the following: Before beginning this procedure read all the instructions. Failure to read and follow the instructions could damage the hoist assembly and you and others could get hurt. Read and follow the instructions listed below. 1. Check under the vehicle to see if the cable is visible. 5-7 1