2008 HUMMER H2 ECU

If your vehicle has roof-rail airbags and a third row
passenger seat, the airbags are located in the ceiling
above the rear windows for the outboard passenger
positions in the third row.
{CAUTION:
If something is between an occupant and an
airbag, the airbag might not inate properly or it
might force the object into that person causing
severe injury or even death. The path of an
inating airbag must be kept clear. Do not put
anything between an occupant and an airbag,
and do not attach or put anything on the
steering wheel hub or on or near any other
airbag covering.
If your vehicle has roof-rail airbags, never
secure anything to the roof of your vehicle by
routing the rope or tie down through any door
or window opening. If you do, the path of an
inating roof-rail airbag will be blocked. Driver Side shown, Passenger Side similar
1-68

The airbag off light will stay on to remind you that the
airbag is off. The right front passenger’s airbag will
remain off until you turn it back on again.
{CAUTION:
If the airbag readiness light ever comes on
when you have turned off the airbag, it means
that something may be wrong with the airbag
system. The right front passenger’s airbag
could inate even though the switch is off.
If this ever happens, do not let anyone whom
the national government has identied as a
member of a passenger airbag risk group
sit in the right front passenger’s position
(for example, do not secure a rear-facing child
restraint in the right front passenger’s seat)
until you have your vehicle serviced. See
Airbag Readiness Light on page 3-34for
additional information.To turn the right front passenger’s airbag on again,
insert your ignition key into the switch, push in,
and move the switch to the on position.
The right front passenger’s frontal airbag is now
enabled (may inate). SeeAirbag Off Light on page 3-35
for more information.United States
Canada
1-74

Servicing Your Airbag-Equipped
Vehicle
Airbags affect how your vehicle should be serviced.
There are parts of the airbag system in several places
around your vehicle. Your dealer/retailer and the service
manual have information about servicing your vehicle
and the airbag system. To purchase a service manual,
seeService Publications Ordering Information on
page 7-15.
{CAUTION:
For up to 10 seconds after the ignition is
turned off and the battery is disconnected, an
airbag can still inate during improper service.
You can be injured if you are close to an
airbag when it inates. Avoid yellow
connectors. They are probably part of the
airbag system. Be sure to follow proper
service procedures, and make sure the person
performing work for you is qualied to do so.
Adding Equipment to Your
Airbag-Equipped Vehicle
Q:Is there anything I might add to or change
about the vehicle that could keep the airbags
from working properly?
A:Yes. If you add things that change your vehicle’s
frame, bumper system, height, front end or side
sheet metal, they may keep the airbag system from
working properly. Changing or moving any parts
of the front 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.
If you have any questions about this, you should
contact Customer Assistance before you modify
your vehicle. 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 7-2.
If your vehicle has rollover roof-rail airbags, seeDifferent
Size Tires and Wheels on page 5-72for additional
important information.
1-75

Keys...............................................................2-3
Remote Keyless Entry (RKE) System................2-4
Remote Keyless Entry (RKE) System
Operation...................................................2-5
Remote Vehicle Start......................................2-8
Doors and Locks............................................2-10
Door Locks..................................................2-10
Power Door Locks........................................2-11
Delayed Locking...........................................2-11
Programmable Automatic Door Locks..............2-11
Rear Door Security Locks..............................2-12
Lockout Protection........................................2-12
Liftgate (SUV)..............................................2-13
Midgate
®(SUT)............................................2-14
Tailgate/Spare Tire Carrier.............................2-16
Windows........................................................2-19
Power Windows............................................2-20
Sun Visors...................................................2-23
Theft-Deterrent Systems..................................2-24
Content Theft-Deterrent.................................2-24
PASS-Key
®III+............................................2-26
PASS-Key®III+ Operation..............................2-26Starting and Operating Your Vehicle................2-28
New Vehicle Break-In....................................2-28
Ignition Positions..........................................2-28
Retained Accessory Power (RAP)...................2-29
Starting the Engine.......................................2-30
Engine Coolant Heater..................................2-31
Automatic Transmission Operation...................2-32
Tow/Haul Mode............................................2-36
Full-Time Four-Wheel Drive............................2-36
Parking Brake..............................................2-40
Shifting Into PARK (P)...................................2-41
Shifting Out of PARK (P)...............................2-42
Parking Over Things That Burn.......................2-43
Engine Exhaust............................................2-43
Running the Engine While Parked...................2-44
Mirrors...........................................................2-45
Automatic Dimming Rearview Mirror with
Compass and Temperature Display..............2-45
Outside Power Foldaway Mirrors.....................2-48
Outside Automatic Dimming Mirror..................2-49
Outside Convex Mirror...................................2-49
Outside Heated Mirrors..................................2-49
Section 2 Features and Controls
2-1

Rear Door Security Locks
Your vehicle may have 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. You must open
the rear doors to access
them. The label depicting
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.To open a rear door when the security lock is on, do the
following:
1. Unlock the by lifting the rear door manual lock, the
power door lock switch, or if the vehicle has one, by
using the Remote Keyless Entry (RKE) transmitter.
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 driver’s side 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.
If the passenger’s side 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 passenger’s door
will unlock. Security Lock Label
shown
2-12

3. Press either one of the two power Midgate latch
release buttons. The Midgate will move slightly
forward from its closed position. The latch release
buttons operate while the ignition is in ON/RUN,
ACC/ACCESSORY, in RAP mode, or up to
ten minutes after removing the key. If necessary,
press the global express-down button to reactivate
the release buttons for an additional ten minutes.
4. Pull the Midgate inward and down to its fully
lowered position.
5. Flip the auxiliary panel on the top of the Midgate
into position to bridge the gap created by the
hinges in the Midgate. There are two nger holds
on the panel.
Raising the Midgate
To raise the Midgate, do the following:
1. Fold the auxiliary panel back into the exterior of the
Midgate. The panel should snap loudly back into
position which means it is secure.
2. Reverse the steps for lowering the Midgate listed
previously. The Midgate must be fully latched on
both sides before the window can be raised.
3. Press the top part of the Midgate window switch to
express-up the window. To stop the window, press
the switch a second time.
2-15

Tailgate/Spare Tire Carrier
Opening the Spare Tire Carrier
To open the spare tire carrier, do the following:
1. Press the button on the pin (B), which is attached to
the cable (A), to remove the pin from the latch nut (C).2. Lift up on the latch on the left side of the vehicle
to release the spare tire carrier from the vehicle.
The handle will stay in the raised position until the
spare tire carrier is closed and latched properly.
{CAUTION:
If you drive with the spare tire carrier
unlatched, you could injure pedestrians or
damage the vehicle. Make sure the carrier is
secure before driving.
2-16

Closing the Spare Tire Carrier
To close the spare tire carrier, do the following:
1. On SUT models swing the tailgate up until it latches
rmly into place.
{CAUTION:
The spare tire carrier must be secured so that
it does not strike and injure someone. Always
close it into the latch forcefully. Make sure that
the release handle is fully closed (down) and
that the cable is attached.
2. Move the spare tire carrier back into place until it
latches, by closing it into the latch forcefully.
The spare tire carrier is latched properly when the
latch handle has lowered to the closed position.3. Reinstall the cable (A) by pushing in the button
on the pin (B) and inserting the pin into the latch
bolt nut (C).
4. Pull on the spare tire carrier to make sure it is
rmly latched.
2-18