Traction control (if equipped)
(diesel engine only):Illuminates
and flashes slowly if the Off Road or
Mud/Snow mode is selected.
Illuminates and flashes rapidly
during a traction control event.
Traction control (if equipped)
(gasoline engine only):
Illuminates when the traction
control is active. If the light remains
on, have the system serviced
immediately, refer to theDrivingchapter for more information.
Trailer anti-lock brake system
(ABS):Illuminates briefly when the
engine is powered-up and only when
a PLC trailer or a PLC diagnostic
tool is connected. If the light
remains on after the vehicle is
started, continues to flash or fails to
illuminate, have the system serviced
immediately.
Turn signal:Illuminates when the
left or right turn signal or the
hazard lights are turned on. If the
indicators stay on or flash faster, check for a burned out bulb.
Wait to start (diesel engine
only):Illuminates when the air
intake heater is in operation and
special starting procedures are
required. Refer toStartingin theDrivingchapter.
WARNING:If equipped with an air intake heater, DO NOT use
ether or any other starting fluids. The use of starting fluids
(ether) in an engine equipped with an air intake heater could result in
damage and/or personal injury.
Instrument Cluster
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Press the control to move the seat
forward, backward, up or down.
Heated seats (if equipped)
WARNING:Persons who are unable to feel pain to the skin
because of advanced age, chronic illness, diabetes, spinal cord
injury, medication, alcohol use, exhaustion, or other physical
conditions, must exercise care when using the seat heater. The seat
heater may cause burns even at low temperatures, especially if used
for long periods of time. Do not place anything on the seat that
insulates against heat, such as a blanket or cushion, because this may
cause the seat heater to overheat. Do not puncture the seat with pins,
needles, or other pointed objects because this may damage the heating
element which may cause the seat heater to overheat. An overheated
seat may cause serious personal injury.
Note:Do not do the following:
•Place heavy objects on the seat
•Operate the seat heater if water or any other liquid is spilled on the
seat. Allow the seat to dry thoroughly.
Press the control to turn the heated
seats on and off.
Seating and Safety Restraints
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1. Ensure headlamps and all electrical accessories are turned off, the
parking brake is applied and the transmission is in the neutral position
(or P [Park], if equipped).
2. Turn the key to the on position, but do not start the engine.
In cooler weather, the air intake heater may activate the
light. If
the
light illuminates,do notcrank the engine until it goes off.
WARNING:If equipped with an air intake heater, DO NOT use
ether or any other starting fluids. The use of starting fluids
(ether) in an engine equipped with an air intake heater could cause an
explosion and result in property damage and/or personal injury.
3. When the
light turns off, turn the key to the start position;
when the engine starts, release the key.
If the engine does not start after 30 seconds of cranking, allow two
minutes for the starter to cool before trying again. Excessive cranking
may damage the starter.
After the engine starts:
•On some engines, the
light should illuminate after the engine
starts. Allow the engine to idle about three minutes or until the engine
coolant temperature gauge begins to rise. Maintain idle speed until
the
light turns off to indicate the air intake heater has shut off
(approximately six minutes); operating the engine at higher speeds
reduces the effectiveness of the air inlet heater.
•Do not increase engine speed until the oil pressure gauge indicates
normal pressure (as indicated by the arrows); this should be indicated
on the gauge within 15 seconds after starting.
•Idle the engine for three to five minutes before operating with a full
load.
•Try to limit engine idle to 10 minutes; excessive idling reduces fuel
economy.
•When starting a cold engine, increase the engine RPM slowly to make
sure adequate lubrication is available to the bearings.
Starting the engine (gasoline engine only)
Engine starting is controlled by the powertrain control system.
This system meets all Canadian interference-causing equipment standard
requirements regulating the impulse electrical field strength of radio noise.
Driving
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Starting a diesel engine with the vehicle on a steep grade
When starting a diesel engine when the loaded vehicle is on a grade, the
engine RPM starts to fall slightly when the clutch is engaged; do not
disengage the clutch and try to increase engine RPM as this may damage
driveline components. The engine recovers as the vehicle begins moving.
Cold weather operation
WARNING:Do not use volatile starting aids such as ether,
propane or gasoline in the engine air intake system. Glow plugs
may ignite vapors which can cause engine damage or personal injury.
For best engine operation in temperatures of 32°F (0°C) or lower:
•Make sure the batteries are the correct type and are fully charged.
Check other electrical components to make sure they’re in optimum
condition.
•Use a permanent-type engine coolant to protect the engine against
damage from freezing.
•If your vehicle is equipped with a water-fuel separator, drain it daily.
Fill the fuel tank at the end of daily operation to prevent condensation
in the fuel system.
•Use the proper engine oil and maintain it at its proper level.
•
At temperatures of –4°F (–20°C) or below, it is recommended that you
use a crankcase-mounted coolant heater to improve cold engine starting.
•If operating in arctic temperatures of –20°F (–29°C) or lower, consult
your truck dealer for information about special cold weather
equipment and precautions.
Note:Idling in cold weather does not heat the engine to its normal
operating temperature. Long periods of idling in cold weather can cause
a build-up of heavy deposits of carbon and rust on valve stems causing
them to stick which, in turn, can cause valvetrain damage.
The use of winter fronts, or other air-restrictive devices mounted in front
of the radiator on vehicles with chassis-mounted charge air coolers, are
not recommended unless extremely cold weather conditions exist. Air
flow restriction can cause high exhaust temperatures, power loss,
excessive fan usage and a reduction in fuel economy. If you must use a
winter front, the device should have a permanent opening of at least 120
sq in. (774 sq. cm) directly in line with the fan hub.
Driving
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Fuse/Relay
locationFuse amp
ratingFuse description
15 10A Interior lamp relay
16 15A High beams, Indicator
17 — Not used
18 5A Dimmer switch, Interior lighting
19 15A Engine control (diesel engine only)
20 5A Starting system
21 10A DRL resistor
22 15A Air horn, Air suspension dump, Two-speed
axle, Driver-controlled locking differential
23 10A Flasher relay
24 15A Hydraulic brakes relay, Fuel heater relay
(diesel engine only), Air dryer
25 10A Blower motor relay coil
26 10A Right-hand low beam headlight
27 — Not used
28 10A Left-hand low beam headlight
29 10A Cluster, GEM
30 15A Allison electronic transmission
31 15A Mirror fold relay
Relay 1 — Interior lamps
Relay 2 — Not used
Relay 3 — Horn
Relay 4 — Not used
Relay 5 — Not used
Roadside Emergencies
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Power distribution box
WARNING:Always disconnect the battery before servicing high
current fuses.
WARNING:To reduce risk of electrical shock, always replace
the cover to the Power Distribution Box before reconnecting the
battery or refilling fluid reservoirs.
Fuse/Relay
locationFuse amp
ratingFuse description
1 20A Upfitter switches (AUX 2 and AUX 4)/Trailer
12V socket pin
2 30A Power seat (driver)
3 30A Power seat (passenger)
4 15A Windshield washer relay, Washer pump motor
5 5A Brake warning switch (hydraulic brake only)
6 20A Upfitter switches (AUX 1 and AUX 3)
7 15A Brake pressure switches, ABS event relay
8 20A DEF (Urea), Line heaters (diesel engine
only)
9 20A Ignition switch, Starter cutoff
503
502
501304
303
302 301
2119 22 2024
23401
207 201202 203204
209 206
208 205602
601118114
110106
102
117 113 109105
101
116 112 108104
115 111 107103
18 16
14 12 10 864
2
17 15
13 11 9 753
1
Roadside Emergencies
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Fuse/Relay
locationFuse amp
ratingFuse description
108 40A Fuel heater (diesel engine only)
20A Fuel pump module (gasoline engine only)
109 40A Power window
110 30A Windshield wiper
111 30A Body builder relay, Parking lamps
112 40A Blower motor
113 30A Heated seats, Air-Ride seat
114 20A Aftertreatment DCU
115 20A Ignition switch, Passenger compartment fuse
box fuses 8, 9, 10 and 11
116 30A Left/Right turn relays, Back-up lamp relay
117 20A Stoplamps
118 60A Hydraulic brake vehicles (Trailer tow package
only)
601 60A Trailer socket
602 60A Air brake trailer tow fuse block
30A Hydraulic brakes pump motor 2
201 — Windshield washer relay
202 — Wiper high/low relay
203 — Wiper run/park relay
204 — Windshield wiper relay
205 — Body builder relay, right turn
206 — Body builder relay, left turn
207 — ABS event relay (Hydraulic brake vehicles
only)
208 — Body builder relay, back-up lamps relay
209 — Auxiliary stoplamp relay
301 — Fuel heater/Fuel transfer pump relay (diesel
engine only)
— Fuel pump module (gasoline engine only)
302 — Body builder relay, parking lamps relay
303 — Blower motor relay
Roadside Emergencies
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Fuse/Relay
locationFuse amp
ratingFuse description
304 — DEF (Urea) line heaters relay (diesel engine
only)
— Powertrain control module power VPWR1
(gasoline engine only)
Individual maxi-fuse holder in engine compartment
Fuse
locationFuse amp
ratingFuse description
9925 30A Hydraulic brakes pump motor 1
Relay center
The relay center is located along the passenger side A-pillar on the right
side of the footwell.
Relay
locationRelay description
R1 Spring applied hydraulic release warning chime module or
PCM power VPWR 2, 3 and 4
R2 A/C compressor clutch
R3 Power windows
R4 Flasher (standard/LED)
R5 Upfitter relay 1
R6 Upfitter relay 2
R7 Headlights
R8 Spare
R1
R9 R10 R11 R12 R13 R14 R15 R16 R17
R18 R19 R20 R21 R22 R23 R24 R25 R26
R2 R3 R4 R5 R6 R7 R8
Roadside Emergencies
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