ad blue GMC SIERRA 2003 Owner's Manual

OnStar®System
OnStar®uses global positioning system (GPS) satellite
technology, wireless communications, and state of
the art call centers to provide you with a wide range of
safety, security, information and convenience services.
An OnStar
®subscription plan is included in the price
of your vehicle. You can easily upgrade or extend your
OnStar
®services to meet your personal needs.
A complete OnStar
®user’s guide and the terms and
conditions of the OnStar®Subscription Service
Agreement are included in your OnStar®-equipped
vehicle’s glove box literature. For more information, visit
www.onstar.com, contact OnStar
®at 1−888−4−ONSTAR
(1−888−466−7827), or press the blue OnStar®button to
speak to an OnStar®advisor 24 hours a day, 7 days
a week.
OnStar®Services
OnStar®provides a number of service plans to closely
meet your needs. Some of the services currently
provided by OnStar
®are:
Automatic Notication of Air Bag Deployment
Emergency Services
Roadside Assistance Stolen Vehicle Tracking
AccidentAssist
Remote Door Unlock
Remote Diagnostics
Online and Personal Concierge Services
Route Support
RideAssist
Information and Convenience Services
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2003 - Sierra Denali

Trailer Wiring Harness
Your pickup is equipped with the eight-wire trailer
towing harness. This harness with a seven-pin universal
heavy-duty trailer connector is attached to a bracket
on the hitch platform.
The Center High-Mounted Stoplamp (CHMSL) wire is
tied next to the trailer wiring harness for use with a
trailer, slide-in camper or cap.The eight-wire harness contains the following trailer
circuits:
Yellow: Left Stop/Turn Signal
Dark Green: Right Stop/Turn Signal
Brown: Taillamps
White: Ground
Light Green: Back-up Lamps
Light Blue: Center High-Mounted Stoplamp
(CHMSL)
Red: Battery Feed
Dark Blue: Trailer Brake
If your trailer is equipped with electrical brakes, you can
get a jumper harness/electric trailer brake control
with a trailer battery feed fuse from your dealer. This
harness and fuse should be installed by your dealer or a
qualied service center.
If you need to tow a light-duty trailer with a standard
four-way round pin connector, you can also get an
adapter from your dealer.
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2003 - Sierra Denali