tow bar HUMMER H2 2005 Owners Manual

Overload and Overheat Protection
Overload protection is designed to protect the air
suspension system and is an indication to the driver that
the vehicle is overloaded.
If the rear suspension remains at a low height, the rear
axle load has exceeded GAWR (Gross Axle Weight
Rating). When the overload protection mode is activated,
the compressor operates for about 30 seconds to one
minute without raising the vehicle depending on the
amount of overload. This will continue each time
the ignition is turned on until the rear axle load is
reduced below GAWR.
If the total rear GAWR (Gross Axle Weight Rating) is
reached, the suspension may be slightly less than level.
This is normal and does not mean there is a problem
with the air suspension.
If the system overheats, it will shut down and stop all
leveling functions until the system cools down.
During this time the SERVICE AIR SUSPENSION
message will appear in the DIC. SeeDriver Information
Center (DIC) on page 3-43for more information.
Trailer Recommendations
You must subtract your hitch loads from the Cargo
Weight Rating (CWR). CWR is the maximum weight of
the load your vehicle can carry. It doesn’t include
the weight of the people inside. But you can gure about
150 lbs. (68 kg) for each seat. The total cargo load
must not be more than your vehicle’s CWR.
Weigh your vehicle with the trailer attached, so that you
won’t go over the GVWR or GAWR. If you are using
a weight-distributing hitch, weigh the vehicle without the
spring bars in place.
You’ll get the best performance if you spread out the
weight of your load the right way, and if you choose the
correct hitch and trailer brakes.
For more information, seeTowing a Trailer on
page 4-68.
4-67

Total Weight on Your Vehicle’s Tires
Be sure your vehicle’s tires are inated to the upper limit
for cold tires. You’ll nd these numbers on the
Certication label at the rear edge of the driver’s door or
seeLoading Your Vehicle on page 4-58. Then be
sure you don’t go over the GVW limit for your vehicle,
or the GAWR, including the weight of the trailer tongue.
If you use a weight distributing hitch, make sure you
don’t go over the rear axle limit before you apply
the weight distribution spring bars.
Hitches
It’s important to have the correct hitch equipment.
Crosswinds, large trucks going by and rough roads are
a few reasons why you’ll need the right hitch.
Weight-Distributing Hitches and Weight
Carrying Hitches
When using a weight-distributing hitch, the hitch must
be adjusted so that the distance (A) remains the
same both before and after coupling the trailer to the
tow vehicle.(A) Body-to-Ground Distance (B) Front of Vehicle
4-73

J
Jump Starting.................................................5-39
K
Keyless Entry System....................................... 2-4
Keys............................................................... 2-3
L
Labelling, Tire Sidewall....................................5-55
Lamps
Battery Run-Down Protection.........................3-17
Dome........................................................3-17
Exterior......................................................3-13
Off-Road....................................................3-16
Reading.....................................................3-17
LATCH System
Child Restraints...........................................1-49
Securing a Child Restraint Designed for the
LATCH System........................................1-51
Liftgate..........................................................2-13
Light
Airbag Off..................................................3-30
Airbag Readiness........................................3-29
Anti-Lock Brake System Warning...................3-34Light (cont.)
Brake System Warning.................................3-32
Charging System.........................................3-31
Cruise Control.............................................3-41
Highbeam On.............................................3-41
Low Fuel Warning.......................................3-43
Malfunction Indicator....................................3-37
Safety Belt Reminder...................................3-28
Security.....................................................3-41
Tow/Haul Mode...........................................3-42
Traction Off................................................3-34
Lighting
Entry/Exit...................................................3-17
Locking Rear Axle...........................................4-10
Lockout Protection..........................................2-13
Locks
Delayed Locking........................................... 2-9
Door........................................................... 2-8
Lockout Protection.......................................2-13
Power Door.................................................. 2-9
Programmable Automatic Door Locks.............2-10
Rear Door Security Locks.............................2-12
Loss of Control...............................................4-15
Low Fuel Warning Light...................................3-43
Luggage Carrier..............................................2-55
Lumbar
Power Controls............................................. 1-3
7