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2-57
Accessory Power Outlets
With the accessory power outlets, you can plug in
auxiliary electrical equipment. There are four accessory
power outlets located throughout the vehicle. Two are
near the lower center part of the instrument panel, one is
located in the lower rear of the center console and the
other is located in the rear of the vehicle in the air
inflator compartment. Follow the proper installation
instructions that are included with any electrical
equipment you install.
These circuits are protected by a fuse and have
maximum current levels.
NOTICE:
When using the accessory power outlets,
maximum electrical load must not exceed 20
amps. Always turn off any electrical equipment
when not in use. Leaving electrical equipment on
for extended periods will drain your battery.
Cellular Telephone (Option)
Your vehicle has been prewired for dealer installation of
a dual
-mode (analog/digital) cellular telephone. A fixed
mobile or a portable hand
-held system is available.
Voice activation and hands
-free operation are standard
features. For more information, contact your GMC
dealer. A user's guide is provided with the telephone.
OnStar System (Option)
This system may be ordered if you have the optional
fixed cellular telephone. The following services are
available 24 hours a day:
Automatic Notification of Front Air Bag
Deployment
Emergency Services
Stolen
-Vehicle Tracking
Remote Door Unlock
Roadside Assistance with Location Route Support
Convenience Services
Remote Diagnostics
Hands
-Free, Voice-Activated Cellular Telephone
For more information, contact your GMC dealer.
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4-54 Maintenance When Trailer Towing
Your vehicle will need service more often when you're
pulling a trailer. See the Maintenance Schedule for more
on this. Things that are especially important in trailer
operation are automatic transmission fluid (don't
overfill), engine oil, axle lubricant, belt, cooling system
and brake system. Each of these is covered in this
manual, and the Index will help you find them quickly.
If you're trailering, it's a good idea to review these
sections before you start your trip.
Check periodically to see that all hitch nuts and bolts
are tight.
Trailer Wiring Harness
The heavy-duty trailer wiring is an eight-wire harness
assembly. The harness is stored under the vehicle, on the
driver's side corner frame rear crossmember. The
heavy
-duty trailer wiring has a 30-amp feed wire with
an in
-line fuse located by the junction block. See ªFuses
and Circuit Breakersº in the Index. The harness does not
have a connector and should be wired by a qualified
electrical technician. The technician can use the
following color code chart when connecting the wiring
harness to your trailer.
Dark Blue: Use for electric trailer brakes or
auxiliary wiring.Red: Use for battery charging; it connects to the
starter solenoid.
Light Green: Back
-up lamps.
Brown: Taillamps and parking lamps.
Yellow: Left stoplamp and turn signal.
Dark Green: Right stoplamp and turn signal.
White (Heavy Gauge): Ground wire.
White (Light Gauge): Auxiliary stoplamp.
Securely attach the harness to the trailer, then tape or
strap it to your vehicle's frame rail. Be sure you leave it
loose enough so the wiring doesn't bend or break, but
not so loose that it drags on the ground. Store the
harness in its original place. Wrap the harness together
and tie it neatly so it won't be damaged.
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6-56
Fuse/Circuit
BreakerUsage
A Not Used
B Not Used
1 Not Used
2 Cigarette Lighter, Data
Link ConnectorFuse/Circuit
BreakerUsage
3 Cruise Control Module and Switch,
Body Control Module, Heated Seats
4 Gages, Body Control Module,
Instrument Panel Cluster
5 Parking Lamps, Power Window
Switch, Body Control Module,
Ashtray Lamp
6 Steering Wheel Audio Control
Illumination
7 Headlamp Switch, Body Control
Module, Headlamp Relay
8 Courtesy Lamps, Battery Run
-Down
Protection
9 Not Used
10 Turn Signal
11 Cluster, Engine Control Module
12 Interior Lights
13 Auxiliary Power
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