GMC 2003 Envoy - Manual (Page 366)

Secondary Latch System
Your vE3hicle has an undeifcody [tiounled lire hoist
asserribly equipped with a secondary lalch syslem.
It's despgngd lo stop the spare or flat road tire
1rom suddenly falling oft your vehicle if the caWe hording
the spare dre is darnaged. For tha secondary lelch lo
worii. fhe spare tire musE be stored ^witti the valve
stem poinling up. See 'Storing a Flal or Spare Tire and
Tools" lor instructions on storing Ihe spare tire
correclly.
CAUTION:
Before beginning this procedure read all the
bstrucllons. Failure lo read and folEow the
instructions could damage the hoist assembly
end you and others could get hurt. Read and
follow the Instructions listed balow*
Someone standing too close during the
procedure could be injured by the Jack.
If the spare tire does not slide o H the jack
comptetelVi make sure no erte Is behind you
or on either side of you as you pull the jack
out from the spare.
To release ihe spang tira from the secondary latch do
the feJiGwing:
1 Check under the
vehicle !o see If
Lhe cable is visible.
S-71