stop start GMC SIERRA CLASSIC 2007 Service Manual

Turn Signals When Towing a Trailer
The arrows on your instrument panel will
ash whenever you signal a turn or lane change.
Properly hooked up, the trailer lamps will also
ash, telling other drivers you’re about to
turn, change lanes or stop.
When towing a trailer, the arrows on your
instrument panel will ash for turns even if the
bulbs on the trailer are burned out. Thus, you may
think drivers behind you are seeing your signal
when they are not. It’s important to check
occasionally to be sure the trailer bulbs are still
working.
Driving On Grades
Reduce speed and shift to a lower gearbefore
you start down a long or steep downgrade. If you
don’t shift down, you might have to use your
brakes so much that they would get hot and no
longer work well.
If you have an automatic transmission, you can
tow in DRIVE (D). You may want to shift the
transmission to lower gear selection if the
transmission shifts too often (e.g., under heavy
loads and/or hilly conditions).You may also want to activate the tow/haul mode
if the transmission shifts too often. SeeTow/Haul
Mode Light on page 264.
If you have a 5-speed manual transmission and
you are towing a trailer, it’s better not to use
FIFTH (5) gear. Just drive in FOURTH (4) gear
(or, as you need to, a lower gear).
When towing at high altitude on steep uphill
grades, consider the following: Engine coolant at
or near sea level will boil at a lower temperature
than at higher altitudes. If you turn your engine off
immediately after towing at high altitude on
steep uphill grades, your vehicle may show signs
similar to engine overheating. To avoid this, let
the engine run while parked, preferably on
level ground, with the automatic transmission in
PARK (P) for a few minutes before turning
the engine off. For manual transmissions, let the
engine run while parked, preferably on level
ground, with the transmission out of gear and the
parking brake applied, for a few minutes before
turning the engine off. If you do get the overheat
warning, seeEngine Overheating on page 505.
453

CAUTION: (Continued)
Always put the automatic transmission
shift lever fully in PARK (P) with the
parking brake rmly set. If you have a
manual transmission, turn the engine off
and rmly set the parking brake.
If the transfer case on four-wheel-drive
vehicles is in NEUTRAL, your vehicle will
be free to roll, even if your automatic
transmission shift lever is in PARK (P).
So, be sure the transfer case is in a drive
gear — not in NEUTRAL.
When You Are Ready to Leave After
Parking on a Hill
1. Apply your regular brakes and hold the pedal
down while you:
Start your engine
Shift into a gear
Release the parking brake
2. Let up on the brake pedal.
3. Drive slowly until the trailer is clear of the
chocks.
4. Stop and have someone pick up and store the
chocks.
455

The tethered fuel cap is located behind a hinged
fuel door on the driver’s side of the vehicle. If
the vehicle has E85 fuel capability, a yellow cap
with the words″E85 or gasoline″can be seen.
To remove the fuel cap, turn it slowly
counterclockwise. It will require more effort
to turn the fuel cap on the last turn as you
loosen it.
{CAUTION:
If you spill fuel and then something
ignites it, you could be badly burned. Fuel
can spray out on you if you open the fuel
cap too quickly. This spray can happen if
your tank is nearly full, and is more likely
in hot weather. Open the fuel cap slowly
and wait for any hiss noise to stop. Then
unscrew the cap all the way.
If your vehicle is a dual fuel tank chassis cab
model, and it runs out of fuel, refuel the front fuel
tank rst to ensure a quick restart.
Be careful not to spill fuel. Do not top off or overll
the tank and wait a few seconds after you have
nished pumping before removing the nozzle.
Clean fuel from painted surfaces as soon as
possible. SeeWashing Your Vehicle on page 592.
475

Fuses Usage
LBEC 1Left Bussed Electrical Center,
Left Doors, Truck Body
Controller, Flasher Module
TRL PARK Parking Lamps Trailer Wiring
RR PARKRight Rear Parking and
Sidemarker Lamps
LR PARKLeft Rear Parking and
Sidemarker Lamps
PARK LP Parking Lamps Relay
STRTR Starter Relay
INTPARK Interior Lamps
STOP LP Stoplamps
TBC BATTTruck Body Controller
Battery Feed
SEO B2 Off-Road Lamps
4WS Not Used
AUX PWRAuxiliary Power Outlet —
Console
PCM 1 Powertrain Control Module
ETC/ECMElectronic Throttle Control,
Electronic Brake
Controller-Gasoline Engine,
Fan Clutch-Diesel EnginesFuses Usage
IGN EInstrument Panel Cluster, Air
Conditioning Relay, Turn
Signal/Hazard Switch,
Starter Relay
RTD Ride Control
TRL B/U Backup Lamps Trailer Wiring
F/PMP Fuel Pump (Relay)
B/U LPBack-up Lamps, Automatic
Transmission Shift Lock
Control System
RR DEFOG Rear Window Defogger
HDLP-HI Headlamp High Beam Relay
PRIME Not Used
AIRBAGSupplemental Inatable
Restraint System
FRT PARKFront Parking Lamps,
Sidemarker Lamps
DRLDaytime Running
Lamps (Relay)
SEO IGN Rear Defog Relay
TBC IGN1 Truck Body Controller Ignition
HI HDLP-LT High Beam Headlamp-Left
LH HID Not Used
606

Spare Tire (cont.)
Removing................................................ 566
Storing..................................................... 584
Specications, Capacities............................ 609
Speedometer............................................... 246
Starting Your Engine................................... 137
Steering...................................................... 367
Steering Wheel Controls, Audio................... 349
Steering Wheel, Tilt Wheel.......................... 213
Storage Areas
Center Console Storage Area................... 202
Cupholder(s)............................................ 202
Front Storage Area.................................. 202
Glove Box................................................ 202
Stuck in Sand, Mud, Ice, or Snow............... 406
Sun Visors.................................................. 131
Sunroof....................................................... 205
Swing-Out Windows.................................... 131
T
Tachometer................................................. 246
Tailgate....................................................... 127
Taillamps
Turn Signal, Stoplamps and Back-up
Lamps.................................................. 539Theft-Deterrent, Radio................................. 348
Theft-Deterrent Systems.............................. 131
Content Theft-Deterrent............................ 131
Passlock
®................................................ 133
Tilt Wheel.................................................... 213
Tires........................................................... 543
Aluminum or Chrome-Plated Wheels,
Cleaning............................................... 594
Buying New Tires..................................... 556
Chains..................................................... 562
Changing a Flat Tire................................ 564
Cleaning.................................................. 595
Different Size........................................... 558
Dual Tire Operation.................................. 552
If a Tire Goes Flat................................... 563
Ination - Tire Pressure............................ 551
Inspection and Rotation............................ 553
Installing the Spare Tire........................... 571
Removing the Flat Tire............................. 571
Removing the Spare Tire and Tools......... 566
Secondary Latch System ......................... 580
Spare Tire................................................ 588
Storing a Flat or Spare Tire and Tools..... 584
Tire Sidewall Labeling.............................. 544
Tire Terminology and Denitions............... 548
672