GMC 2003 Envoy - Manual (Page 81)

Vour vehicle tnay have this featuce. You can lock the
rear dciors 30 ihay can'l be opened from the in&ide
by passeriners. To use one of thaso locks da the
fQltowing:
1 Open one ot the iear doors. You will Tind a
security lock lever located on the inside edge
of- each rear door
2. Move the lever down
!o engage the salely
lock. Move the lever
up to disengage
the saleiy lock.
Rear Door Security Locks The rear doors of your vahicte cannot be opened from
the Inside when this Teature is in use. 11 you want to
open the rear door when the secunty lock is on, unlock
the door arrd opan the door [rcm Ihe outside.
Lockout Protection
Thts feature stops thfl power door locks front locking
when Ihe key is in the ignition and a door is open
1o protect you from locking your key In the vehicle.
If the power lock switch is pressed when a door is open
and the key is in The ignition, all the doers will Jock
and then the driver's door will unlock.
Leaving Your Vehicle
If you are leaving the vehjcle^ take your key, open youf
door and sol the luck from inside. Then geJ out and
close Ihe door.
3+ Ctose the doOr
4, Do the same thing to (he otlier rear door.
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