2009 HUMMER H3 ECU

For some children who have
outgrown child restraints and for
very small adults, the passenger
sensing system may or may not turn
off the right front passenger frontal
airbag and seat-mounted side
impact airbag (if equipped),
depending upon the person seating
posture and body build. Everyone
in the vehicle who has outgrown
child restraints should wear a safety
belt properly — whether or not
there is an airbag for that person.
{CAUTION
If the airbag readiness light ever
comes on and stays on, it means
that something may be wrong with
the airbag system. To help avoid
injury to yourself or others, have
the vehicle serviced right away.
SeeAirbag Readiness Light on
page 3-25for more information,
including important safety
information.
If the On Indicator is Lit for a
Child Restraint
If a child restraint has been installed
and the on indicator is lit:
1. Turn the vehicle off.
2. Remove the child restraint from
the vehicle.
3. Remove any additional items
from the seat such as blankets,
cushions, seat covers, seat
heaters, or seat massagers.
4. Reinstall the child restraint
following the directions provided
by the child restraint manufacturer
and refer toSecuring a Child
Restraint in the Right Front Seat
Position on page 1-43.5. If, after reinstalling the child
restraint and restarting the
vehicle, the on indicator is still lit,
turn the vehicle off. Then slightly
recline the vehicle seatback
and adjust the seat cushion, if
adjustable, to make sure that the
vehicle seatback is not pushing
the child restraint into the
seat cushion.
Also make sure the child restraint
is not trapped under the vehicle
head restraint. If this happens,
adjust the head restraint. See
Head Restraints on page 1-2.
6. Restart the vehicle.
If the on indicator is still lit with a
child present in a child restraint,
secure the child restraint in a rear
seat position in the vehicle and
check with your dealer/retailer.
1-56 Seats and Restraint System

seats, safety belts, the airbag
sensing and diagnostic module,
steering wheel, instrument panel,
roof-rail airbag modules, ceiling
headliner or pillar garnish trim,
overhead console, front sensors,
side impact sensors, rollover
sensor module, or airbag wiring
can affect the operation of the
airbag system.
In addition, the vehicle has a
passenger sensing system for the
right front passenger position,
which includes sensors that are
part of the passenger seat.
The passenger sensing system
may not operate properly if the
original seat trim is replaced with
non-GM covers, upholstery or
trim, or with GM covers,
upholstery or trim designed for a
different vehicle. Any object, such
as an aftermarket seat heater or a
comfort enhancing pad or device,
installed under or on top of theseat fabric, could also interfere
with the operation of the
passenger sensing system.
This could either prevent proper
deployment of the passenger
airbag(s) or prevent the
passenger sensing system from
properly turning off the passenger
airbag(s). SeePassenger
Sensing System on page 1-54.
If you have any questions, call
Customer Assistance. The phone
numbers and addresses for
Customer Assistance are in
Step Two of the Customer
Satisfaction Procedure in this
manual. SeeCustomer
Satisfaction Procedure on
page 7-1.
If the vehicle has rollover
roof-rail airbags, seeDifferent
Size Tires and Wheels on
page 5-61for additional
important information.Q:Because I have a disability,
I have to get my vehicle
modied. How can I nd out
whether this will affect my
airbag system?
A:If you have questions, call
Customer Assistance. The phone
numbers and addresses for
Customer Assistance are in
Step Two of the Customer
Satisfaction Procedure in this
manual. SeeCustomer
Satisfaction Procedure on
page 7-1.
In addition, your dealer/retailer and
the service manual have information
about the location of the airbag
sensors, sensing and diagnostic
module and airbag wiring.
Seats and Restraint System 1-59

Features and
Controls
Keys
Keys...................................2-2
Remote Keyless Entry
(RKE) System...................2-3
Remote Keyless Entry
(RKE) System Operation. . .2-4
Doors and Locks
Door Locks.........................2-5
Power Door Locks..............2-6
Programmable Automatic
Door Locks........................2-6
Rear Door Security Locks. . . .2-6
Lockout Protection..............2-7
Tailgate..............................2-7
Swing-gate.........................2-9
Windows
Windows.............................2-9
Power Windows................2-10
Sun Visors........................2-11
Theft-Deterrent Systems
Theft-Deterrent Systems. . . .2-11
Content Theft-Deterrent.....2-11
Passlock®(U.S. Only).......2-12
PASS-Key®III+ Electronic
Immobilizer......................2-13
PASS-Key®III+ Electronic
Immobilizer Operation
(Canada Only)
.................2-14
Starting and Operating
Your Vehicle
New Vehicle Break-In.......2-15
Ignition Positions...............2-16
Retained Accessory
Power (RAP)...................2-17
Starting the Engine...........2-17
Engine Coolant Heater......2-19
Automatic Transmission
Operation........................2-19
Manual Transmission
Operation........................2-22
Full-Time Four-Wheel
Drive...............................2-24
Parking Brake...................2-28
Shifting Into Park
(Automatic
Transmission)
..................2-29
Shifting Out of Park
(Automatic
Transmission)
..................2-30
Parking the Vehicle
(Manual Transmission). . . .2-31Parking Over Things
That Burn........................2-31
Engine Exhaust.................2-31
Running the Vehicle
While Parked..................2-32
Mirrors
Automatic Dimming
Rearview Mirror...............2-33
Compass..........................2-34
Outside Power Mirrors......2-35
Outside Convex Mirror......2-35
Object Detection
Systems
Rear Vision
Camera (RVC)................2-36
OnStar®System
OnStar®System................2-39
Features and Controls 2-1

From the inside, use the manual lock
levers or power door lock switch.
Power Door Locks
The power door lock switches are
located on the driver’s and the front
passenger doors.Press L (lock) to lock all the doors
at once. To unlock all the doors,
press U (Unlock).
Programmable Automatic
Door Locks
With an automatic transmission,
the vehicle is pre-programmed to
automatically lock the doors when
shifted out of P (Park). All doors
unlock when the vehicle is shifted
back into P (Park).
With a manual transmission, the
vehicle is pre-programmed to
automatically lock the doors when
the vehicle speed reached 15 mph
(24 km/h). Removing the key
from the ignition unlocks the doors.
To program the automatic door
locks, see “Automatic Door Locks”
underDIC Operation and Displays
on page 3-34.
Rear Door Security Locks
Each rear door can be locked so it
cannot be opened from the inside.
The rear door security lock is
located on the inside edge of
each rear door.
To engage a security lock:
1. Open one of the rear doors.
2. Use the ignition key to turn the
lock toward the front of the
vehicle.
3. Close the door.
4. Repeat these steps on the
other rear door.
Driver’s side shown
2-6 Features and Controls

To open a rear door when the
security lock is set, unlock the door
and open the door from the outside.
To disengage a security lock:
1. Open one of the rear doors.
2. Use the ignition key to turn the
lock to the vertical position.
3. Close the door.
4. Repeat these steps on the other
rear door.
Lockout Protection
This feature protects against locking
the key in the vehicle when it is
in the ignition.
A chime sounds as an alert to
indicate that the key has been left in
the ignition. When the power door
lock switch is pressed, a door is
open, and the key is in the ignition
all of the doors lock and then
the driver’s door unlocks.
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.Open the tailgate by pulling up on
the outside handle while pulling
the tailgate down.
When putting the tailgate up,
be sure it latches securely.
Features and Controls 2-7

Removing the Tailgate
To remove the tailgate:
1. Open the tailgate fully and
remove the retainer clip from the
driver’s side hinge.
It is recommended that the
retainer clip be stored in a safe
place, like the glove box.2. Lift up slightly on the entire
tailgate assembly.
Remove the retaining cables
from both sides of the pickup box
by pulling the clips away from
the bolt heads while pushing the
cable bracket forward. When
the larger part of the hole on the
bracket is over the bolt, slide
the bracket off of the bolt.
3. With the tailgate partially down,
lift up on the passenger’s side
and pull the tailgate toward you,
then move the tailgate to the
right to release the driver’s side.
Reverse the procedure to reinstall
the tailgate. Make sure it is secure.To partially lower the tailgate:
1. With the tailgate fully open, lift up
slightly on the entire tailgate
assembly.
2. Remove the retaining cable from
the passenger side of the pickup
box by pulling the clip away
from the bolt head while pushing
the cable bracket forward.
When the larger part of the hole
on the bracket is over the bolt,
slide the bracket off of the bolt.
Tailgate Partially Down
2-8 Features and Controls

Press the button again to turn the
lockout off. A red band on the
side of the button is lit when the
windows are not locked out.
Sun Visors
Pull the visor toward you, or move it
to the side to help reduce glare.
Pull out the extenders for further
coverage.
On a visor with a mirror, lift the
cover to use it.
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
This vehicle has a content
theft-deterrent alarm system.
The security light is located on the
instrument panel cluster.
To arm the system:
1. Close all the doors.
2. Lock the doors with the Remote
Keyless Entry (RKE) transmitter.
The security light ashes.If the lock button on the RKE
transmitter is pressed, but a door
is open, the doors lock, the lights
may ash and the horn may sound.
Close the open door to arm the
system.
The alarm goes off if a locked
door is not opened using the
RKE transmitter, or by OnStar
®.
A pre-alarm sounds the horn at
reduced intensity for 10 seconds.
Then, the front turn signal lamps
ash for two minutes, and the horn
sounds for two minutes. The alarm
then turns off to save battery power.
Start the engine to turn off the alarm.
The theft-deterrent system does not
activate if the doors are locked with
the key, the manual door lock, or
power door lock switch. The system
can only be activated using the
RKE transmitter, or by OnStar.
SeeOnStar
®System on page 2-39
for additional information. The
vehicle can be started with the
correct key if the alarm has been
set off.
Features and Controls 2-11

To avoid setting off the alarm by
accident:
Lock the vehicle with the manual
door lock lever, the power door
lock switch, or the key, after
the doors are closed.
Unlock the doors by pressing the
unlock button on the RKE
transmitter or by contacting
OnStar. Unlocking a door any
other way activates the alarm.
Press unlock on the RKE
transmitter, start the vehicle with
the correct key, or have OnStar
unlock the doors to turn the alarm
off. The alarm does not stop if
a door is unlocked any other way.
Testing the Alarm
To test the alarm:
1. From inside the vehicle, lock the
doors with the RKE transmitter.
2. Unlock the door with the manual
door lock and open the door.
The pre-alarm should sound
followed by the full alarm about
10 seconds later.
3. Press the unlock button on the
RKE transmitter or start the
engine to turn the alarm off.
If the alarm does not sound but the
lights ash, check to see if the
horn works. The horn fuse could be
blown. To replace the fuse, see
Fuses and Circuit Breakers
on page 5-91.
If the alarm does not sound or
the front turn signal lamps do not
ash, see your dealer/retailer
for service.
Passlock®(U.S. Only)
Passlock®is a passive
theft-deterrent system that enables
fuel if the vehicle is started with
a valid key. If an incorrect key
is used or the ignition lock cylinder
is tampered with, the fuel system
is disabled and the vehicle does
not start.
The security light turns off
approximately ve seconds after
the engine is started. SeeSecurity
Light on page 3-33.
If the engine stalls and the security
light ashes, wait about 10 minutes
until the light stops ashing
before trying to restart the engine.
Release the key from START
as soon as the engine starts.
If the engine does not start after
three tries, the vehicle needs
service.
2-12 Features and Controls