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2008 Hummer H2 Owner's Manual - Page 322

2008 Hummer H2 Manual

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Electronically Controlled Air Suspension System The electronically controlled air suspension, if equipped, keeps the rear of your vehicle level under all load conditions. The system maintains the vehicle at the currently selected ride height. There are two ride heights: Normal Ride Height and Extended Ride Height. The Extended Ride Height feature is only available if the vehicle speed is below 40 mph (64 km/h). If the vehicle is at Extended Ride Height and the speed exceeds 40 mph (64 km/h), the system will automatically return the vehicle to Normal Ride Height. The activation and deactivation of the Extended Ride Height feature is controlled by a switch on the instrument panel. The system includes a compressor, two height sensors and two air springs supporting the vehicle. The system is activated when the engine is started and deactivated when the ignition is returned to OFF. The engine must be running for the rear of the vehicle to be raised and the doors must be closed to enable a transition between Normal Ride Height and Extended Ride Height. You may hear the compressor running whilst the system is active and you may also hear the release of air similar to a hissing sound. This is normal. Load leveling will not function normally with the inflater hose attached to the inflator outlet. Remove the hose from the outlet when it is not in use. See Accessory Inflator on page 5-75. 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. The system may reactivate without cycling the ignition if some of the excess load is removed. 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. 4-54

Section	Page
2008 HUMMER H2 BookTOC	1
Seats and Restraint Systems	5
Front Seats	6
Power Seats	6
Power Lumbar	7
Heated Seats	8
Memory Seat and Mirrors	8
Power Reclining Seatbacks	9
Head Restraints	11
Rear Seats	12
Heated Seats	12
Split Folding Rear Seat	12
Third Row Seat	14
Safety Belts	20
Safety Belts: They Are for Everyone	20
How to Wear Safety Belts Properly	26
Lap-Shoulder Belt	34
Safety Belt Use During Pregnancy	39
Safety Belt Extender	39
Child Restraints	40
Older Children	40
Infants and Young Children	43
Child Restraint Systems	47
Where to Put the Restraint	50
Lower Anchors and Tethers for Children (LATCH)	51
Securing a Child Restraint in a Rear Seat Position	61
Securing a Child Restraint in the Right Front Seat Position	64
Airbag System	68
Where Are the Airbags?	70
When Should an Airbag Inflate?	73
What Makes an Airbag Inflate?	74
How Does an Airbag Restrain?	74
What Will You See After an Airbag Inflates?	74
Airbag Off Switch	76
Servicing Your Airbag-Equipped Vehicle	79
Adding Equipment to Your Airbag-Equipped Vehicle	79
Restraint System Check	80
Checking the Restraint Systems	80
Replacing Restraint System Parts After a Crash	81
Features and Controls	83
Keys	85
Remote Keyless Entry (RKE) System	86
Remote Keyless Entry (RKE) System Operation	87
Remote Vehicle Start	90
Doors and Locks	92
Door Locks	92
Power Door Locks	93
Delayed Locking	93
Programmable Automatic Door Locks	93
Rear Door Security Locks	94
Lockout Protection	94
Liftgate (SUV)	95
Midgate® (SUT)	96
Tailgate/Spare Tire Carrier	98
Windows	101
Power Windows	102
Sun Visors	105
Theft-Deterrent Systems	106
Content Theft-Deterrent	106
PASS-Key® III+	108
PASS-Key® III+ Operation	108
Starting and Operating Your Vehicle	110
New Vehicle Break-In	110
Ignition Positions	110
Retained Accessory Power (RAP)	111
Starting the Engine	112
Engine Coolant Heater	113
Automatic Transmission Operation	114
Tow/Haul Mode	118
Full-Time Four-Wheel Drive	118
Parking Brake	122
Shifting Into PARK (P)	123
Shifting Out of PARK (P)	124
Parking Over Things That Burn	125
Engine Exhaust	125
Running the Engine While Parked	126
Mirrors	127
Automatic Dimming Rearview Mirror with Compass and Temperature Display	127
Outside Power Foldaway Mirrors	130
Outside Automatic Dimming Mirror	131
Outside Convex Mirror	131
Outside Heated Mirrors	131
Object Detection Systems	132
Rear Vision Camera	132
OnStar® System	135
Universal Home Remote System	139
Universal Home Remote System Operation (With Three Round LED)	139
Storage Areas	146
Glove Box	146
Cupholder(s)	146
Center Console Storage	146
Luggage Carrier	147
Rear Seat Armrest	147
Cargo Tie Downs (SUT)	147
All-Weather Cargo Area (SUT)	148
Sunroof	149
Instrument Panel	151
Instrument Panel Overview	154
Hazard Warning Flashers	156
Other Warning Devices	156
Horn	156
Tilt Wheel	156
Turn Signal/Multifunction Lever	157
Turn and Lane-Change Signals	158
Headlamp High/Low-Beam Changer	158
Flash-to-Pass	159
Windshield Wipers	159
Windshield Washer	160
Rear Window Wiper/Washer	161
Cruise Control	162
Exterior Lamps	165
Headlamps on Reminder	167
Daytime Running Lamps (DRL)	167
Automatic Headlamp System	168
Instrument Panel Brightness	168
Dome Lamps	169
Dome Lamp Override	169
Entry/Exit Lighting	169
Reading Lamps	169
Battery Run-Down Protection	169
Accessory Power Outlet(s)	170
Ashtray(s) and Cigarette Lighter	171
Analog Clock	171
Climate Controls	172
Dual Automatic Climate Control System	172
Outlet Adjustment	179
Rear Air Conditioning and Heating System and Electronic Climate Controls	179
Warning Lights, Gages, and Indicators	181
Instrument Panel Cluster	182
Speedometer and Odometer	183
Trip Odometer	183
Tachometer	183
Safety Belt Reminders	183
Airbag Readiness Light	184
Airbag Off Light	185
Charging System Light	187
Voltmeter Gage	187
Brake System Warning Light	188
Antilock Brake System Warning Light	189
StabiliTrak® Indicator Light	190
Engine Coolant Temperature Gage	190
Tire Pressure Light	191
Malfunction Indicator Lamp	192
Oil Pressure Gage	195
Oil Pressure Light	196
Security Light	196
Cruise Control Light	196
Highbeam On Light	197
Tow/Haul Mode Light	197
Fuel Gage	197
Low Fuel Warning Light	198
Driver Information Center (DIC)	199
DIC Operation and Displays (Using DIC Buttons)	199
DIC Operation and Displays (Using Trip Odometer Reset Stem)	204
DIC Warnings and Messages	206
DIC Vehicle Customization (With DIC Buttons)	213
Audio System(s)	222
Setting the Clock	223
Radio(s) (MP3)	225
Using an MP3 (Radio with Six-Disc Player)	244
Using an MP3 (Radio with CD and DVD Player)	248
XM Radio Messages	253
Navigation/Radio System	254
Rear Seat Entertainment (RSE) System	255
Rear Seat Audio (RSA)	264
Theft-Deterrent Feature	266
Audio Steering Wheel Controls	266
Radio Reception	267
Fixed Mast Antenna	268
XM™ Satellite Radio Antenna System	268
Driving Your Vehicle	269
Your Driving, the Road, and Your Vehicle	270
Defensive Driving	270
Drunk Driving	270
Control of a Vehicle	271
Braking	271
Antilock Brake System (ABS)	272
Braking in Emergencies	273
Traction Control System (TCS)	273
Locking Rear Axle	274
StabiliTrak® System	275
Steering	277
Off-Road Recovery	279
Passing	280
Loss of Control	280
Off-Road Driving	281
Assist Steps	300
Driving at Night	300
Driving in Rain and on Wet Roads	301
Before Leaving on a Long Trip	302
Highway Hypnosis	302
Hill and Mountain Roads	303
Winter Driving	304
If Your Vehicle is Stuck in Sand, Mud, Ice, or Snow	307
Rocking Your Vehicle to Get It Out	308
Recovery Loops	308
First Aid Kit and Tool Kit	310
Front Mounted Receiver	311
Power Winch Platform	311
Loading Your Vehicle	312
Towing	319
Towing Your Vehicle	319
Recreational Vehicle Towing	319
Selectable Extended Rear Ride Height	321
Electronically Controlled Air Suspension System	322
Towing a Trailer	323
Trailer Recommendations	335
Service and Appearance Care	337
Service	339
Accessories and Modifications	339
California Proposition 65 Warning	339
California Perchlorate Materials Requirements	340
Doing Your Own Service Work	340
Adding Equipment to the Outside of Your Vehicle	340
Fuel	341
Gasoline Octane	341
Gasoline Specifications	341
California Fuel	341
Additives	342
Fuels in Foreign Countries	342
Filling the Tank	343
Filling a Portable Fuel Container	345
Checking Things Under the Hood	345
Hood Release	346
Engine Compartment Overview	348
Engine Oil	349
Engine Oil Life System	352
Engine Air Cleaner/Filter	354
Automatic Transmission Fluid	357
Engine Coolant	360
Coolant Surge Tank Pressure Cap	362
Engine Overheating	363
Overheated Engine Protection Operating Mode	364
Cooling System	365
Engine Fan Noise	369
Power Steering Fluid	370
Windshield Washer Fluid	371
Brakes	372
Battery	375
Jump Starting	376
Rear Axle	381
Four-Wheel Drive	382
Front Axle	383
Bulb Replacement	384
Halogen Bulbs	384
Headlamps	384
Front Turn Signal and Parking Lamps	385
Daytime Running Lamps (DRL)	386
Roof Marker Lamps	386
Taillamps, Turn Signal, Stoplamps and Back-up Lamps	387
Replacement Bulbs	389
Windshield Wiper Blade Replacement	390
Tires	391
Tire Sidewall Labeling	392
Tire Terminology and Definitions	394
Inflation - Tire Pressure	397
Tire Pressure Monitor System	398
Tire Pressure Monitor Operation	400
Tire Inspection and Rotation	403
When It Is Time for New Tires	405
Buying New Tires	406
Different Size Tires and Wheels	408
Uniform Tire Quality Grading	408
Wheel Alignment and Tire Balance	410
Wheel Replacement	410
Tire Chains	411
Accessory Inflator	411
If a Tire Goes Flat	414
Changing a Flat Tire	414
Removing the Spare Tire and Tools (SUT)	416
Removing the Spare Tire and Tools (SUV)	420
Removing the Flat Tire and Installing the Spare Tire	424
Storing a Flat or Spare Tire and Tools (SUT)	430
Storing a Flat or Spare Tire and Tools (SUV)	432
Spare Tire	435
Appearance Care	436
Interior Cleaning	436
Fabric/Carpet	437
Leather	438
Instrument Panel, Vinyl, and Other Plastic Surfaces	438
Wood Panels	439
Speaker Covers	439
Care of Safety Belts	439
Weatherstrips	439
Washing Your Vehicle	439
Cleaning Exterior Lamps/Lenses	440
Finish Care	440
Windshield, Backglass, and Wiper Blades	441
Aluminum Wheels	442
Tires	442
Sheet Metal Damage	442
Finish Damage	443
Underbody Maintenance	443
Chemical Paint Spotting	443
Vehicle Care/Appearance Materials	444
Vehicle Identification	445
Vehicle Identification Number (VIN)	445
Service Parts Identification Label	445
Electrical System	446
Add-On Electrical Equipment	446
Windshield Wiper Fuses	446
Power Windows and Other Power Options	446
Fuses and Circuit Breakers	446
Instrument Panel Fuse Block	447
Center Instrument Panel Fuse Block	448
Underhood Fuse Block	449
Capacities and Specifications	453
Maintenance Schedule	455
Maintenance Schedule	456
Introduction	456
Maintenance Requirements	456
Your Vehicle and the Environment	456
Using the Maintenance Schedule	456
Scheduled Maintenance	458
Additional Required Services	460
Maintenance Footnotes	461
Owner Checks and Services	462
At Each Fuel Fill	463
At Least Once a Month	463
At Least Once a Year	464
Recommended Fluids and Lubricants	466
Maintenance Replacement Parts	468
Engine Drive Belt Routing	469
Maintenance Record	470
Customer Assistance Information	473
Customer Assistance and Information	474
Customer Satisfaction Procedure	474
Online Owner Center	476
Customer Assistance for Text Telephone (TTY) Users	476
Customer Assistance Offices	477
GM Mobility Reimbursement Program	478
Roadside Assistance Program	478
Scheduling Service Appointments	480
Courtesy Transportation	481
Collision Damage Repair	482
Reporting Safety Defects	486
Reporting Safety Defects to the United States Government	486
Reporting Safety Defects to the Canadian Government	486
Reporting Safety Defects to General Motors	486
Service Publications Ordering Information	487
Vehicle Data Recording and Privacy	488
Event Data Recorders	488
OnStar®	489
Navigation System	489
Radio Frequency Identification (RFID)	489

Match case Limit results 1 per page

Electronically Controlled Air

Suspension System

The electronically controlled air suspension, if equipped,

keeps the rear of your vehicle level under all load

conditions. The system maintains the vehicle at the

currently selected ride height. There are two ride

heights: Normal Ride Height and Extended Ride Height.

The Extended Ride Height feature is only available if

the vehicle speed is below 40 mph (64 km/h). If the

vehicle is at Extended Ride Height and the speed

exceeds 40 mph (64 km/h), the system will automatically

return the vehicle to Normal Ride Height. The activation

and deactivation of the Extended Ride Height feature

is controlled by a switch on the instrument panel.

The system includes a compressor, two height sensors

and two air springs supporting the vehicle.

The system is activated when the engine is started and

deactivated when the ignition is returned to OFF.

The engine must be running for the rear of the vehicle

to be raised and the doors must be closed to enable

a transition between Normal Ride Height and Extended

Ride Height.

You may hear the compressor running whilst the system

is active and you may also hear the release of air

similar to a hissing sound. This is normal.

Load leveling will not function normally with the

inflater hose attached to the inflator outlet. Remove

the hose from the outlet when it is not in use.

See

Accessory Inflator on page 5-75

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. The system may reactivate without

cycling the ignition if some of the excess load is

removed.

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.

4-54