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Electrical System
Electrical System Overload
The vehicle has fuses and circuit breakers to
protect against an electrical system
overload.
When the current electrical load is too
heavy, the circuit breaker opens and closes,
protecting the circuit until the current load
returns to normal or the problem is fixed.
This greatly reduces the chance of circuit
overload and fire caused by electrical
problems.
Fuses and circuit breakers protect power
devices in the vehicle.
If there is a problem on the road and a fuse
needs to be replaced, the same amperage
fuse can be borrowed. Choose some feature
of the vehicle that is not needed to use and
replace it as soon as possible.
To check a fuse, look at the band inside the
fuse. If the band is broken or melted,
replace the fuse. Be sure to replace a bad
fuse with a fuse of the identical size and
rating.
Replacing a Blown Fuse
1. Turn off the vehicle.
2. Locate the fuse puller in the enginecompartment fuse block.
3. Use the fuse puller to remove the fusefrom the top or side, as shown above.
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286 Vehicle Care
4. If the fuse must be replacedimmediately, borrow a replacement fuse
with the same amperage from the fuse
block. Choose a vehicle feature that is
not needed to safely operate the vehicle.
Repeat Steps 2-3.
5. Insert the replacement fuse into the empty slot of the blown fuse.
At the next opportunity, see your dealer to
replace the blown fuse.
Headlamp Wiring
An electrical overload may cause the lamps
to go on and off, or in some cases to
remain off. Have the headlamp wiring
checked right away if the lamps go on and
off or remain off.
Windshield Wipers
If the wiper motor overheats due to heavy
snow or ice, the windshield wipers will stop
until the motor cools and will then restart. Although the circuit is protected from
electrical overload, overload due to heavy
snow or ice may cause wiper linkage
damage. Always clear ice and heavy snow
from the windshield before using the
windshield wipers.
If the overload is caused by an electrical
problem and not snow or ice, be sure to get
it fixed.
Fuses and Circuit Breakers
The wiring circuits in the vehicle are
protected from short circuits by a
combination of fuses and circuit breakers.
This greatly reduces the chance of damage
caused by electrical problems.
{Danger
Fuses and circuit breakers are marked
with their ampere rating. Do not exceed
the specified amperage rating when
replacing fuses and circuit breakers. Use
of an oversized fuse or circuit breaker can
result in a vehicle fire. You and others
could be seriously injured or killed.
{Warning
Installation or use of fuses that do not
meet GM’s original fuse specifications is
dangerous. The fuses could fail, and result
in a fire. You or others could be injured
or killed, and the vehicle could be
damaged.
See Accessories and Modifications 0256 and
General Information 0256.
To check or replace a blown fuse, see
Electrical System Overload 0285.
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Engine Compartment Fuse Block
To remove the fuse block cover, squeeze the
clip and lift it up.
Caution
Spilling liquid on any electrical
component on the vehicle may damage
it. Always keep the covers on any
electrical component.
The vehicle may not be equipped with all of
the fuses, relays, and features shown.Micro Fuses Usage
F02 CLSTR
F03 N/A
F06 OSRVM DEFOG F07 L/GATE RELSE
F08 AHL AFL MTR1
F09 VENT SEAT F10 N/A F11 AHL AFL MTR2
F12 N/A
F14 ISRVM REAR VIEW CAMERA F15 DEFC MDL RUN/CRNK
F16 HDLP LVL F17 N/A-DSL
F18 FTZM
F19 N/A
F20 N/A F22 TRLR ST/TRN LT - TRLR
F24 ESCL F25 ECM TCM RUN/CRNK
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M-case Fuses UsageF61 N/A
Mini Relays Usage K03 RUN/CRNK
K04 REAR DEFOG
K06 STRTR PINION
K08 PT RLY
K09 FUEL HTR DSL
HC Micro Relays Usage
K01 N/A
K02 N/A
K05 STRTR SOL
K07 A/C CNTRL K10 N/A
Ultra Micro Relays Usage
K11 N/AInstrument Panel Fuse Block
The instrument panel fuse block is on the
underside of the driver side instrument
panel. To access the fuses, open the fuse
cover by pulling out. To reinstall the cover,
insert the top tab first, then push the cover
back into its original location.
Fuse Usage
F01 LUMBAR
F02 SUNROOF
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290 Vehicle Care
FuseUsage
F03 VBAT_3
F04 VBAT_7 F05 VBAT_6
F06 AUTO HVAC F07 CGM
F08 ST_WHL_HTR
F09 DISPLAY F10 RADIO F11 ONSTAR (ERA)
F12 PARK_ASSIST
F13 MAN. HVAC
F14 WL CHARGER F15 VBAT_2
F16 VBAT_1 F17 SWC BKLT
F18 N/A
F19 N/A
F20 CLOCK SPRING F21 OCC SEN Fuse
Usage
F22 DLC
F23 SDM
F24 IGN_SW/ESCL F25 PWR L-GATE MDL
F26 SEC FUSE-2 F27 PWR SEAT CO-DR
F28 VBAT_8
F29 DC-DC AT
F30 PWR L-GATE MDL F31 OSRVM
F32 FRT HS PWR-1
F33 VBAT_4
F34 FRT HS PWR-2 F35 AMPLIFIER
F36 ONSTAR (TCP) F37 PWR SEAT DR
F38 DC-DC_400W
F39 SEC FUSE-1
F40 HVAC_BLOWER Circuit
Breaker Usage
CB1 N/A
CB2 APO
Relay Usage
K01 i-RAP_ACC
K02 RUN
K03 LOGISTICS
K04 N/A K05 N/A
K06 N/A
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Rear Compartment Fuse Block
The rear compartment fuse block is behind a
cover on the driver side of the rear
compartment. To access the fuses, remove
the cover.
FuseUsage
F01 N/A
F02 RDCM ELEC Fuse
Usage
F03 N/A
F04 N/A F05 DC/AC INVERTER
F06 N/A F07 RDCM
F08 RR SEAT HEAT PWR1
F09 N/A F10 RR SEAT HEAT PWR2 F11 N/A
F12 N/A
F13 N/A
F14 N/A F15 N/A
F16 N/A F17 N/A
F18 N/A
F19 N/A
F20 N/A F21 N/A
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TPC Spec number is molded onto the
tire's sidewall near the tire size. If the
tires have an all-season tread design,
the TPC Spec number will be followed
by MS for mud and snow. SeeTire
Sidewall Labeling 0293 for additional
information.
GM recommends replacing worn tires in
complete sets of four. Uniform tread
depth on all tires will help to maintain
the performance of the vehicle. Braking
and handling performance may be
adversely affected if all the tires are not
replaced at the same time. If proper
rotation and maintenance have been
done, all four tires should wear out at
about the same time. However, if it is
necessary to replace only one axle set
of worn tires, place the new tires on
the rear axle. See Tire Rotation0303.
{Warning
Tires could explode during improper
service. Attempting to mount or
dismount a tire could cause injury or
(Continued)
Warning (Continued)
death. Only your dealer or authorized
tire service center should mount or
dismount the tires.
{Warning
Mixing tires of different sizes (other
than those originally installed on the
vehicle), brands, tread patterns,
or types may cause loss of vehicle
control, resulting in a crash or other
vehicle damage. Use the correct size,
brand, and type of tire on all wheels.
{Warning
Using bias-ply tires on the vehicle
may cause the wheel rim flanges to
develop cracks after many miles of
driving. A tire and/or wheel could fail
suddenly and cause a crash. Use only
radial-ply tires with the wheels on
the vehicle. Winter tires with the same speed rating
as the original equipment tires may not
be available for H, V, W, Y and ZR
speed rated tires. Never exceed the
winter tires’
maximum speed capability
when using winter tires with a lower
speed rating.
If the vehicle tires must be replaced
with a tire that does not have a TPC
Spec number, make sure they are the
same size, load range, speed rating, and
construction (radial) as the original
tires.
The Tire and Loading Information label
indicates the original equipment tires
on the vehicle. See Vehicle Load Limits
0 197.
Different Size Tires and Wheels
If wheels or tires are installed that are a
different size than the original equipment
wheels and tires, vehicle performance,
including its braking, ride and handling
characteristics, stability, and resistance to
rollover may be affected. If the vehicle has
electronic systems such as antilock brakes,
rollover airbags, traction control, electronic
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Warning (Continued)
changing a flat tire. If it is used for
anything else, you or others could be
badly injured or killed if the vehicle slips
off the jack. If a jack is provided with the
vehicle, only use it for changing a
flat tire.
If a tire goes flat, avoid further tire and
wheel damage by driving slowly to a level
place, well off the road, if possible. Turn on
the hazard warning flashers. See Hazard
Warning Flashers 0126.
{Warning
Changing a tire can be dangerous. The
vehicle can slip off the jack and roll over
or fall causing injury or death. Find a
level place to change the tire. To help
prevent the vehicle from moving:
1. Set the parking brake firmly.
2. Put an automatic transmission in P (Park) or a manual transmission in
1 (First) or R (Reverse).
3. Turn off the engine and do not restart while the vehicle is raised.
(Continued)
Warning (Continued)
4. Do not allow passengers to remainin the vehicle.
5. Place wheel blocks, if equipped, on both sides of the tire at the opposite
corner of the tire being changed.
When the vehicle has a flat tire (2), use the
following example as a guide to assist in the
placement of the wheel blocks (1),
if equipped.
1. Wheel Block (If Equipped)
2. Flat Tire
The following information explains how to
repair or change a tire.
Tire Changing
Removing the Spare Tire and Tools
The spare tire and tools are located under
the load floor in the rear of the vehicle.
Without Subwoofer
1. Tow Eye
2. Jack
3. Wrench
4. Strap
5. Funnel