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Warning (Continued)
including the pressure cap, is hot. Wait
for the cooling system and pressure cap
to cool.
Caution
Failure to follow the specific coolant fill
procedure could cause the engine to
overheat and could cause system
damage. If coolant is not visible in the
surge tank, contact your dealer.
The coolant surge tank pressure cap can be
removed when the cooling system, including
the surge tank pressure cap and upper
radiator hose, is no longer hot.
1. Turn the pressure cap slowly counterclockwise. If a hiss is heard, wait
for that to stop. A hiss means there is
still some pressure left. 2. Keep turning the cap and remove it.
3. Fill the coolant surge tank with the
proper mixture to the mark pointed to
on the front of the coolant surge tank.
4. With the coolant surge tank cap off, start the engine and let it run until the
upper radiator hose starts getting hot.
Watch out for the engine cooling fan. By
this time, the coolant level inside the
coolant surge tank may be lower. If the
level is lower, add more of the proper
mixture to the coolant surge tank until
the level reaches the mark pointed to on
the front of the coolant surge tank.
5. Replace the cap tightly. 6. Verify coolant level after the engine is
shut off and the coolant is cold.
If necessary, repeat coolant fill procedure
Steps 1–6.
Caution
If the pressure cap is not tightly installed,
coolant loss and engine damage may
occur. Be sure the cap is properly and
tightly secured.
Engine Overheating
The vehicle has an engine coolant
temperature gauge on the instrument
cluster to warn of engine overheating. See
Engine Coolant Temperature Gauge 086.
Caution
Do not run the engine if there is a leak
in the engine cooling system. This can
cause a loss of all coolant and can
damage the system and vehicle. Have
any leaks fixed right away.
If the decision is made not to lift the hood
when this warning appears, get service help
right away.
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274 Vehicle Care
Taillamps, Turn Signal, Stoplamps,
and Back-Up Lamps
1. LED Taillamp, see your dealer forservice
2. Back-up lamp
3. Stoplamp/Turn Signal
1. Open the tailgate.
2. Remove the two rear lamp assembly screws.
3. Pull the rear lamp assembly outboard, by slightly rotating to clear the inner strip
of sheet metal, until the retainers
release.4. Pull the rear lamp assembly straight backto remove it from the vehicle. This may
require a forceful tug to pop the
fasteners loose. There will be a noise
when the retainers release.
5. Turn the bulb socket counterclockwise.
6. Pull the bulb straight out from the socket.
7. Replace the bulb, then insert the bulb socket into the rear lamp assembly and
turn clockwise.
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Vehicle Care 275
8. Verify the retainer ring is in the properposition. If the retainer ring is out of
position, it will not engage. Reset the
retainer by pulling it forward with a tool.
9. Align the two outboard snap-in retainers and the two inboard locator pins during
installation.
10. Make sure the rear lamp assembly is flush with the box side.
11. Reinstall the two rear lamp assembly screws.
Center High-Mounted Stoplamp
(CHMSL) and Cargo Lamp
1. Cargo Lamp Bulbs
2. Center High-Mounted Stoplamp(CHMSL) Bulb
To replace one of these bulbs:
1. Remove the two screws and lift off thelamp assembly.
2. Turn the bulb socket counterclockwise and pull it straight out.
3. Pull the bulb straight out from the socket.
4. Replace the bulb and reverse Steps 1–3 to reinstall.
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276 Vehicle Care
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.
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.
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Vehicle Care 277
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 0253 and
General Information 0253.
To check or replace a blown fuse, see
Electrical System Overload 0276.
Engine Compartment Fuse Block
The engine compartment fuse block is in the
engine compartment, on the driver side of
the vehicle. See Engine Compartment
Overview 0256
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278 Vehicle Care
Lift the cover to access the fuse block.
Caution
Spilling liquid on any electrical
component on the vehicle may damage
it. Always keep the covers on any
electrical component.
A fuse puller is available inside this fuse
block.
The vehicle may not be equipped with all of
the fuses, relays, and features shown. Fuses Usage
F01 ICCM –Integrated
Chassis Control Module
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FusesUsage
F02 FUEL TANK ZONE MDL –
Fuel Tank Zone Module
F03 –
F04 Cooling Fan 2 F05 –
F06 –
F07 MTAOP –Transmission
Auxiliary Oil Pump
Motor
F08 –
F09 –
F10 –
F11 SECONDARY AXLE MTR –Front Drive Axle
Actuator
F12 –
F13 Trailer Connector
F14 –
F15 SBZA/CVS –Side Blind
Zone Alert/Canister
Vent Solenoid
F16 – Fuses
Usage
F17 –
F18 –
F19 EBCM –Electronic Brake
Control Module
F20 Cooling Fan 1 F21 –
F22 –
F23 –
F24 Cooling Fan 3 F25 ENG MISC 1 & 2 –Wide
Range Air Fuel Oxygen
Sensor/Canister Purge/
Turbo Bypass/Step Cam
Intake-Exhaust Solenoids
Block Coolant Valve
Actuator/Mass Air
Flow/Humidity/
Induction Air
Temperature/Throttle
Inlet Pressure Sensors
F26 A/C CLUTCH –Air
Compressor Clutch
F27 Park Lamps Fuses
Usage
F28 TIM 2 –Trailer Interface
Module 2
F29 Spare
F30 –
F31 POWER TRAIN IGN 1 –
Power Train Ignition 1
F32 –
F33 TRLR REVERSE LAMPS –
Trailer Reverse Lamps
F34 TIM 1 –Trailer Interface
Module 1
F35 Spare
F36 ENGINE CONTROL MDL –Engine Control
Module
F37 IGNITION COILS
F38 TRLR STOP LAMP LT –
Trailer Stop Lamp Left
F39 TRLR STOP LAMP RT –
Trailer Stop Lamp Right
F40 TCCM –Transfer Case
Control Module
F41 Starter Pinion
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FusesUsage
F78 –
F79 –
F80 –
F81 –
F82 –
F83 LED Cargo Lamp
F84 ELM 7 –Exterior
Lighting Module 7 –Left
Front Park Lamp/
Daytime Running Lamp/
Left Front Turn Lamp/
Center High Mounted
Stop Lamp/Right Rear
Park Lamp/Reverse
Lamps
F85 –
F86 Horn F87 Front Washer Pump
F88 –
F89 – Fuses
Usage
F90 MISC WINDOWS RIGHT –Passenger Door Panel
Switch (Express Down)
Window Motor Right
Front (Express
Up/Down)
Window Switch Right
Rear (Express Down)
Window Motor Right
Rear (Express Up/Down)
F91 –
Instrument Panel Fuse Block
The instrument panel fuse block is behind a
side trim panel. Unclip the sides of the trim,
then pull the cover away from the trim
panel to access the fuse block.
There is a cover on the instrument panel
fuse block. Press the clips on the side to
remove the cover.