Lockout Protection; Rear Doors - Chevrolet 2008 Silverado 1500 Pickup Owner's Manual

When you want to open a rear door when the security
lock is on, do the following:
1. Unlock the door by lifting the rear door manual lock,
using the power door lock switch, or the Remote
Keyless Entry (RKE) transmitter, if the vehicle
has one.
2. Open the door from the outside.
To cancel the rear door security lock, do the following:
1. Unlock the door and open it from the outside.
2. Insert the key into the security lock slot and turn it
so the slot is in the vertical position.

Lockout Protection

This feature protects you from locking the key in the
vehicle when the key is in the ignition and a front door
is open.
If the driver's side power door lock switch is pressed
when the driver's door is open and the key is in the
ignition, all of the doors will lock and then the driver's
door will unlock.
If the passenger's side power door lock switch is
pressed when the front passenger's door is open and
the key is in the ignition, all of the doors will lock
and then the front passenger's door will unlock.
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Rear Doors

Extended Cab
Your vehicle may have a rear access door(s) that allows
easier access to the rear area of the extended cab.
You must fully close a rear access door before you can
close the front door.
To open a rear access
door from the outside,
first open the front door.
Then, use the handle
located on the front edge
of the rear access door
to open it.