2008 CHEVROLET AVALANCHE ECU

You can turn the delayed locking feature off or back on
again by doing the following:
1. Press and hold the power door lock switch in the
lock position.
2. Press unlock twice on the RKE transmitter.
This feature will not operate if the key is in the ignition.
You can also program this feature using the Driver
Information Center (DIC). See “Door Lock Delay” under
DIC Vehicle Customization (With DIC Buttons) on
page 3-66.
Programmable Automatic Door
Locks
Vehicles with an automatic lock/unlock feature enable
you to program the vehicle’s power door locks. You can
program this feature through the Driver Information
Center (DIC). SeeDIC Vehicle Customization (With DIC
Buttons) on page 3-66for more information on DIC
programming.
Rear Door Security Locks
Your vehicle has rear door security locks. These
prevent passengers from opening the rear doors from
the inside.
The rear door security
locks are located on the
inside edge of each
rear door.
The rear doors must be open to access them.
The label showing lock and unlock positions is located
near the lock.
To set the locks, do the following:
1. Insert the key into the security lock slot and turn it
so the slot is in the horizontal position.
2. Close the door.Security Lock Label
shown
2-11

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 your key in the
vehicle when the key is in the ignition and a door
is open.
If the power lock switch is pressed when a door is open
and the key is in the ignition, all of the doors will lock
and then the driver’s door will unlock.
Midgate®
{CAUTION:
It can be dangerous to drive with the cargo
area covered and the tailgate and the Midgate®
open because carbon monoxide (CO) gas can
come into your vehicle. You can not see or
smell CO. It can cause unconsciousness and
even death. If you must drive with the cargo
covers on and the tailgate and Midgate
®
open or if electrical wiring or other cable
connections must pass through the seal
between the body and the Midgate
®:
Make sure all windows are shut.
Turn the fan on your heating or cooling
system to its highest speed on the setting
that brings in outside air. This will force
outside air into your vehicle. SeeDual
Automatic Climate Control System on
page 3-24.
If you have air outlets on or under the
instrument panel, open them all the way.
SeeEngine Exhaust on page 2-48.
2-12

Midgate®Operation
Your vehicle is equipped with a Midgate®and a
removable rear glass panel. The Midgate®allows
you to extend the length of your vehicle’s cargo area.
The following are the main components of the Midgate
®
system:
A. Latch Levers
B. Grab HandlesC. Glass-Catch
Release ButtonD. Glass Lock
Knobs
E. Window Retaining
TabsF. Midgate
®Release
Handle
G. Window Alignment
Arrows
Rear Glass Removal and Storage
{CAUTION:
If the removable rear glass is not stored
properly, it could be thrown about the vehicle
in a crash or sudden maneuver. People in the
vehicle could be injured. Whenever you store
the rear glass in the vehicle, always be sure
that it is stored securely in the Midgate
®
storage pocket.
Do not remove the rear glass when the rear defroster is
on. If you remove the rear glass with the rear defroster
on, you may see a discharge spark coming from
the latch area.
2-13

6. Turn both glass lock knobs (D), located at both
top corners of the storage pocket, to the locked
position. Push in on the corner of the rear glass to
allow the lock knob to engage more easily.Once both glass lock knobs are in the locked
position, the rear glass is securely stored.
7. Push both latch levers up to the locked position.
You should hear a click when each latch lever
locks correctly.
The rear seats can be returned to the normal
position when the rear glass is out and stored
properly in the storage pocket.
2-16

Lowering the Midgate®with the Rear
Glass in Place
The Midgate®can be lowered to allow the cargo area of
your vehicle to extend into the cab. The rear glass
can be either installed in its normal position, or it can be
removed and stored in the rear glass storage pocket.
To lower the Midgate
®, do the following:
1. Fold the rear seats. The front seats might have to
be moved forward slightly to allow the rear seats to
fold. SeeRear Seat Operation on page 1-12for
more information.
2. Standing outside of the vehicle, hold the Midgate
®
securely so it does not fall forward. Turn the
Midgate®handle clockwise and pull the Midgate®
toward you.Rear Glass in Normal Position
2-19

This procedure works the same as the procedure
described previously, but when you lower the Midgate®
with the rear glass in the stored position, you will notice
that the entire crossbar will lower with the Midgate®.This is completely normal; however, since the crossbar
lowers with the Midgate
®, it will be heavier. As you lower
the Midgate®be ready for the extra weight and do not let
the Midgate®fall as you lower it.
Raising the Midgate®
To return the Midgate®to its normal position, raise the
Midgate®up with a rm swinging motion until it latches
into place securely. This will help to ensure that the
Midgate
®closes with enough force to engage the latches.
If the rear glass is removed and you would like to put it
back, do so using the instructions given previously.
Midgate
®Lowered with Crossbar Attached
2-21

Tailgate
{CAUTION:
It is extremely dangerous to ride on the
tailgate, even when the vehicle is operated at
low speeds. People riding on the tailgate can
easily lose their balance and fall in response
to vehicle maneuvers. Falling from a moving
vehicle may result in serious injuries or death.
Do not allow people to ride on the tailgate. Be
sure everyone in your vehicle is in a seat and
using a safety belt properly.
Use the Remote Keyless Entry (RKE) transmitter or
power door lock switch to lock and unlock the tailgate.
Open the tailgate by lifting up on its handle while pulling
the tailgate toward you.
To shut the tailgate, push it rmly upward until it
latches. Push and pull on the tailgate to be sure it is
latched securely.
Tailgate Removal
The tailgate is not to be removed. This may cause
damage to electrical connector resulting in loss
of lock/unlock and rear vision camera function.
Power Running Boards
Your vehicle may have power running boards.
The power running boards automatically extend from
beneath the vehicle on the side in which the door
has been opened. Once the door is closed, the running
boards will automatically move back under the vehicle
after a brief delay. The vehicle must not be moving
for the running boards to extend or retract.
The switch used to disable
the power running boards
is located on the center
console below the climate
control system.
The running boards cannot be disabled in the extended
position.
2-22

Theft-Deterrent Systems
Vehicle theft is big business, especially in some cities.
This vehicle has theft-deterrent features, however,
they do not make it impossible to steal.
Content Theft-Deterrent
Your vehicle has a content theft-deterrent alarm system.
This is the security light.
To arm the theft-deterrent system:
1. Open the door.
2. Lock the door with the Remote Keyless Entry (RKE)
transmitter or the power door lock switch. The
security light will come on to inform the driver the
system is arming. If a door is open when the doors
are locked, the security light will ash.If the delayed locking feature is turned on, the
theft-deterrent system will not start the arming
process until the last door is closed and the delay
timer has expired. SeeDelayed Locking on
page 2-10.
3. Close all doors. The security light should go off
after about 30 seconds. The alarm is not armed
until the security light goes off.
The content theft deterrent system does not
sense if the midgate or tailgate are open or ajar,
therefore, vehicle contents may not be protected
if the midgate is left open or ajar.
If a locked door is opened without using the RKE
transmitter, a ten second pre-alarm will occur. The horn
will chirp and the lights will ash. If the key is not placed
in the ignition and turned to START or the door is not
unlocked by pressing the unlock button on the RKE
transmitter during the ten second pre-alarm, the alarm
will go off. Your vehicle’s headlamps will ash and the
horn will sound for about two minutes, then will turn off
to save the battery power.
2-26