2015 VOLVO XC90 air suspension

STARTING AND DRIVING
* Option/accessory, for more information, see Introduction.
352
CAUTION
The maximum trailer weights listed are only applicable for altitudes up to 3,280 ft(1000 m) above sea level. With increasingaltitude the engine power and therefore thecar's climbing ability are impaired because ofthe reduced air density, so the maximumtrailer weight has to be reduced accordingly.The weight of the vehicle and trailer must bereduced by 10% for every further 3,280 ft(1000 m) (or part thereof). When towing5,950 lbs (2,700kg) hill inclination is restric-ted to 14%.
WARNING
• Bumper-attached trailer hitches must not be used on Volvos, nor should safetychains be attached to the bumper.
• Trailer hitches attaching to the vehiclerear axle must not be used.
• Never connect a trailer's hydraulic brakesystem directly to the vehicle brake sys-tem, nor a trailer's lighting system directlyto the vehicle lighting system. Consultyour nearest authorized Volvo retailer forcorrect installation.
• When towing a trailer, the trailer's safetychains or wire must be correctly fastenedto the attachment points provided in thetrailer hitch on the vehicle. The safetychain or wire must never be fastened toor wound around the towing ball.
Trailer cableAn adapter is required if the vehicle's trailer hitch has a 13-pin connector and the trailer has 7 pins.Use an adapter cable approved by Volvo. Makesure the cable does not drag on the ground.
Self-leveling suspension
*With this system, the rear suspension maintains aconstant level, regardless of the load in the cargocompartment (up to the max. permissible load).When the engine is not running, the rear of thevehicle sinks down slightly, which is normal.
Related information
•Detachable trailer hitch (p. 353)
• Trailer Stability Assist (TSA) (p. 354)
• Weights (p. 539)

WHEELS AND TIRES
473
Snow tires and chains
The use of snow chains and/or winter tires can help improve traction in winter driving conditions.
Snow chains can be used on your Volvo with the following restrictions:
• Snow chains should be installed on front wheels only. Use only Volvo approved snowchains.
• If accessory, aftermarket or "custom" tiresand wheels are installed and are of a size dif-ferent than the original tires and wheels,chains in some cases CANNOT be used.Sufficient clearances between chains andbrakes, suspension and body componentsmust be maintained.
• Some strap-on type chains will interfere withbrake components and therefore CANNOTbe used.
• All Wheel Drive models
: Snow chains
should only be installed on the front wheels.
• Certain size tires may not allow the assemblyof snow chains/traction devices.
Consult your Volvo retailer for additional snow chain information.
CAUTION
• Snow chains should not be used on wheels larger than 19".
• Always follow the chain manufacturer'sinstallation instructions carefully. Installchains as tightly as possible andretighten periodically.
• Check local regulations regarding the useof snow chains before installing.
• Use single-sided snow chains only.
• Never exceed the chain manufacturer'sspecified maximum speed limit. (Underno circumstances should you exceed31 mph (50 km/h).
• Avoid bumps, holes or sharp turns whendriving with snow chains.
• The handling of the vehicle can beadversely affected when driving withchains. Avoid fast or sharp turns as wellas locked wheel braking.
Checking tire inflation pressure
Correct tire inflation pressure helps improve driv- ing stability, save fuel and increase the servicelife of the tires.
WARNING
• Under-inflation is the most common cause of tire failure and may result insevere tire cracking, tread separation, or"blow-out," with unexpected loss of vehi-cle control and increased risk of injury.
• Under-inflated tires reduce the load car-rying capacity of your vehicle.
Cold tiresInflation pressure should be checked when the tires are cold. The tires are considered to be cold when they have the same temperature as the sur-rounding (ambient) air. This temperature is normally reached after the vehicle has been parked for at least 3 hours. After driving a distance of approximately 1 mile (1.6 km), the tires are considered to be hot. If youhave to drive farther than this distance to pumpyour tire(s), check and record the tire pressurefirst and add the appropriate air pressure whenyou get to the pump. When weather temperature changes occur, tire inflation pressures also change. A 10-degree

MAINTENANCE AND SERVICING
* Option/accessory, for more information, see Introduction.
508
Fuses in the cargo compartment The fuses in the cargo compartment help pro- tect electrical components such as power seats *, airbags and seat belt tensioners.
The fuse box is under the storage compartment on the right side
Positions
• Fuses 13–17 and 21–36 are called "Micro".
• Fuses 1–12, 18–20 and 37 are called "MCase" and should only be replaced by atrained and qualified Volvo service technician.
FunctionA
Heated tailgate window30
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FunctionA
Pneumatic suspension
* compressor40
Heated rear seat (passenger side) *30
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Heated rear seat (driver side)*30
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FunctionA
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Power tailgate*25
Power passenger seat * module20
Trailer hitch * control module40
Seat belt tensioner module (pas- senger side)40