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288 Vehicle Care
Headlamp Aiming
Headlamp aim has been preset and
should need no further adjustment.
If the vehicle is damaged in a crash,
the headlamp aim may be affected.
If adjustment to the headlamps is
necessary, see your dealer.
Bulb Replacement
For the proper type of replacement
bulbs, seeReplacement
Bulbs 0289.
For any bulb-changing procedure
not listed in this section, contact
your dealer.
Taillamps, Turn Signal,
and Stoplamps
1. Turn Signal Lamp
2. Stoplamp/Taillamp
To replace one of these bulbs: 1. Open the liftgate. See Liftgate 039.
2. Remove the convenience net, if the vehicle has one.
3. Remove the two taillamp screwcovers.
4. Remove the two screws holding the taillamp assembly
in place.
5. Pull out the taillamp assembly.
6. Turn the bulb socket counterclockwise and pull it
straight out to remove it from
the taillamp assembly.
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7. Pull the old bulb straight out ofthe bulb socket.
8. Push the new bulb straight into the bulb socket.
9. Push the taillamp assembly back into its original location.
When reinstalling the taillamp
assembly, make sure the pin
on the taillamp assembly lines
up and is inserted correctly into
the opening of the vehicle.
10. Reinstall the two screws that hold the taillamp assembly in
place.
11. Reinstall the two taillamp screw covers.
License Plate Lamp
To replace one of these bulbs:
1. Open the liftgate. See Liftgate 039.
2. Push the left end of the lamp
assembly toward the right.
3. Turn the lamp assembly down to remove it from the liftgate.
4. Turn the bulb socket (1)counterclockwise to remove it
from the lamp assembly (3).
5. Pull the bulb (2) straight out of the bulb socket.
6. Push the replacement bulb straight into the bulb socket
and turn the bulb socket
clockwise to install it into the
lamp assembly.
7. Turn the lamp assembly into the liftgate engaging the clip
side first.
8. Push on the lamp side opposite the clip until the lamp assembly
snaps into place.
Replacement Bulbs
Exterior Lamp Bulb
Number
License Plate Lamp 194 LL
Rear Turn
Signal Lamp 7443 NA
Taillamp/Stop Lamp 7444 LL
For replacement bulbs not listed
here, contact your dealer.
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290 Vehicle Care
Electrical System
High Voltage Devices and
Wiring
{Warning
Exposure to high voltage can
cause shock, burns, and even
death. The high voltage
components in the vehicle can
only be serviced by technicians
with special training.
High voltage components are
identified by labels. Do not
remove, open, take apart,
or modify these components.
High voltage cable or wiring has
orange covering or labels. Do not
probe, tamper with, cut, or modify
high voltage cable or wiring.
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.
Replace a bad fuse with a new one
of the identical size and rating.
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.
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.
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Fuses and Circuit
Breakers
The wiring circuits in your vehicle
are protected from short circuits by
a combination of fuses, circuit
breakers and fusible thermal links.
This greatly reduces the chance of
fires caused by electrical problems.
Look at the silver-colored band
inside the fuse. If the band is broken
or melted, replace the fuse. Be sure
you replace a bad fuse with a new
one of the identical size and rating.
Fuses of the same amperage can
be temporarily borrowed from
another fuse location, if a fuse goes
out. Replace the fuse as soon as
you can.
Engine Compartment
Fuse Block
The underhood fuse block is in the
engine compartment, on the
passenger side of the vehicle.
Lift the cover for access to the fuse/
relay block.
Caution
Spilling liquid on any electrical
component on the vehicle may
damage it. Always keep the
covers on any electrical
component.
To remove fuses, hold the end of
the fuse between your thumb and
index finger and pull straight out.
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292 Vehicle Care
The vehicle may not be equipped
with all of the fuses, relays, and
features shown.Fuses Usage
A/C CLTCH A/C clutch
ABS MTR ABS motor Fuses Usage
AIRBAG Airbag system
AUX POWER Auxiliary power
AUX
VAC PUMP Auxiliary
vacuum pump
AWD AWD system
BATT 1 Battery 1
BATT 2 Battery 2
BATT 3 Battery 3 CIGAR
LIGHTER Cigarette lighter
ECM 1 Engine control module 1
ECM/
FPM IGN Engine control
module/Fuel pump
control module
ignition
EMISSION 1 Emission 1
EMISSION 2 Emission 2
EVEN COILS Injector coils –even
FAN 1 Cooling Fan 1
FAN 2 Cooling Fan 2
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FusesUsage
FPM Fuel pump power module
HORN Horn
HTD MIR Heated exterior rearview mirror
HTD
STR WHL Heated steering
wheel
HUMIDITY/ MAF Humidity sensor/
MAF sensor
HVAC BLWR HVAC blower LT HI BEAM Left high-beam headlamp
LT LO BEAM Left low-beam headlamp
LT PRK Left parking lamp
LT TRLR
STOP/TRN Left trailer
stoplamp/Turn
signal lamp
ODD COILS Injector Coils –odd
PWR L/GATE Power liftgate
PWR
OUTLET Power outlet Fuses
Usage
RR APO Rear accessory power outlet
RR DEFOG Rear defogger RR HVAC Rear climate control system
RT HI BEAM Right high-beam headlamp
RT LO BEAM Right low-beam headlamp
RT PRK Right parking lamp
RT TRLR
STOP/TRN Right trailer
stoplamp/Turn
signal lamp
RVC SNSR Regulated voltage control sensor
S/ROOF/
SUNSHADE Sunroof
SERVICE Service repair SPARE –
STOP LAMP Stoplamps
STRTR StarterTCM Transmission control module Fuses
Usage
TRANS Transmission TRLR
BCK/UP Trailer reverse
lamps
TRLR BRK Trailer brake lamps TRLR
PRK LAMP Trailer parking
lamps
TRLR PWR Trailer power WPR/WSW Windshield wiper/ Washer
Relays Usage
A/C
CMPRSR CLTCH A/C clutch
AUX
VAC PUMP Auxiliary
vacuum pump
CRNK Switched power
FAN 1 Cooling fan 1
FAN 2 Cooling fan 2
FAN 3 Cooling fan 3
HI BEAM High-beam headlamps
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RelaysUsage
HID/
LO BEAM Low-beam HID
headlamps
HORN Horn IGN Ignition –main
LT TRLR
STOP/TRN Left trailer
stoplamp/Turn
signal lamp
PRK LAMP Parking lamps PWR/TRN Powertrain
RR DEFOG Rear window defogger
RT LO BEAM Right low-beam headlamp
RT TRLR
STOP/TRN Right trailer
stoplamp/Turn
signal lamp
STOP LAMP Stoplamps TRLR
BCK/UP Trailer reverse
lamps
WPR Windshield wiper
WPR HI Windshield wiper –
high speedInstrument Panel Fuse
Block
The instrument panel fuse block is
under the instrument panel on the
passenger side of the vehicle. Pull
down on the cover to access the
fuse block.
Fuse Side
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The vehicle may not be equipped
with all of the fuses, relays, and
features shown.Fuses Usage
# GMC Non-HID = Low-beam
)GMC Non-HID =
High-shutter
) )Chevy = Fog lamps
) ) )Buick China = Rear
fog lamps
AIRBAG Airbag AMP Amplifier
BCK
UP/STOP Reverse lamps/
Stoplamps
BCM Body control module
CNSTR VENT Canister vent
CTSY Courtesy lamps
DR LCK Door locks DRL/
LO BEAM Daytime running
lamps relay/
Low-beam
headlamps relay Fuses Usage
DSPLY Display
FRT WSW Front windshield washer
HTD/
COOL SEAT Heated/Cooling
seats
HVAC HVAC
INADV PWR INT LAMPS Inadvertent power/
Interior light pipe
lamps
INFOTMNT/ MSM Infotainment/
Memory seat
module
LT TRN SIG Left turn signal lamp
OBS
DET/URS Rear park assist/
Side blind zone
alert/Forward
collision alert/
Universal remote
system
PDM Power mirrors/ Liftgate release
PWR MODE Power mode PWR MIR Power mirrors Fuses Usage
RDO Radio
REAR WPR Rear wiper
RT TRN SIG Right turn signal lamp
STR WHL ILLUM Steering wheel
illumination
USB CHRG USB charging