
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
If you have the optional trailering package, your vehicle
will have an eight-wire harness, including the center
high-mounted stoplamp battery feed wire. The harness
is stored on the passenger’s side of the vehicle near
the rear wheel well. This harness has a 30 amp battery
feed wire and no connector, and should be wired by
a qualified electrical technician. After choosing an
aftermarket trailer mating connector pair, have the
technician attach one connector to the eight-wire trailer
harness and the other connector to the wiring harness
on the trailer. Be sure the wiring harness on the trailer is
taped or strapped to the trailer’s frame rail and leave
it loose enough so the wiring doesn’t bend or break, but
not so loose that it drags on the ground. The eight-wire
harness must be routed out of your vehicle between the
rear door and the floor, with enough of the harness
left on both sides so that the trailer or the body won’t pull
it. If you do not have the optional trailering package,
your vehicle will still have a trailering harness. The
harness is located near the passenger’s side rear wheel
well. It consists of six wires that may be used by
after-market trailer hitch installers.
The technician can use the following color code chart
when connecting the wiring harness to your trailer.
•
Brown: Rear lamps.
•
Yellow: Left stoplamp and turn signal.
•
Dark Green: Right stoplamp and turn signal.
•
White (Heavy Gage): Ground.
•
Light Green: Back-up lamps.
•
White (Light Gage): Center High-Mounted Stoplamp.
•
Blue: Auxiliary circuit (eight-wire harness only).
•
Orange: Fused auxiliary (eight-wire harness only).
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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Summary of Contents for 2004 Astro
Page 5: ...These are some examples of symbols you may find on your vehicle v ...
Page 6: ...Model Reference This manual covers these models Cargo Van Passenger Van vi ...
Page 21: ...Put someone on it Get it up to speed Then stop the vehicle The rider doesn t stop 1 15 ...
Page 78: ... NOTES 1 72 ...
Page 120: ... NOTES 2 42 ...
Page 122: ...Instrument Panel Overview 3 2 ...
Page 226: ...Engine Compartment Overview When you open the hood this is what you will see 5 12 ...
Page 319: ...Engine Drive Belt Routing 5 105 ...
Page 320: ... NOTES 5 106 ...
Page 353: ...Maintenance Record cont d Date Odometer Reading Serviced By Maintenance Record 6 33 ...
Page 354: ...Maintenance Record cont d Date Odometer Reading Serviced By Maintenance Record 6 34 ...