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On all vehicles, the ignition keyshould come out only in LOCK/OFF.
Contact your dealer if service isrequired.
Park Brake and P (Park)
Mechanism Check
{Warning
When you are doing this check,
the vehicle could begin to move.
Yo u o r o t h e r s c o u l d b e i n j u r e d
and property could be damaged.
Make sure there is room in front
of the vehicle in case it begins to
roll. Be ready to apply the regular
brake at once should the vehicle
begin to move.
Park on a fairly steep hill, with thevehicle facing downhill. Keepingyour foot on the regular brake, setthe parking brake.
.To c h e c k t h e p a r k i n g b r a k e ' sholding ability: With the enginerunning and the transmission inN(Neutral), slowly remove foot
pressure from the regular brakepedal. Do this until the vehicle isheld by the parking brake only.
.To c h e c k t h e P ( P a r k )mechanism's holding ability:With the engine running, shift toP(Park). Then release theparking brake followed by theregular brake.
Contact your dealer if service isrequired.
Wiper Blade Replacement
Windshield wiper blades should beinspected for wear or cracking.
Replacement blades come indifferent types and are removed indifferent ways. For properwindshield wiper blade length andtype, seeMaintenanceReplacement Parts0464.
Caution
Allowing the wiper arm to touch
the windshield when no wiper
blade is installed could damage
(Continued)
Caution (Continued)
the windshield. Any damage that
occurs would not be covered by
the vehicle warranty. Do not allow
the wiper arm to touch the
windshield.
To r e p l a c e t h e w i n d s h i e l d w i p e rblade:
1. Pull the windshield wiperassembly away from thewindshield.
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High Intensity Discharge
(HID) Lighting
{Warning
The High Intensity Discharge
(HID) lighting system operates at
averyhighvoltage.Ifyoutryto
service any of the system
components, you could be
seriously injured. Have your
dealer or a qualified technician
service them.
After an HID headlamp bulb hasbeen replaced, the beam might be aslightly different shade than it wasoriginally. This is normal.
LED Lighting
This vehicle has several LED lamps.For replacement of any LED lightingassembly, contact your dealer.
Headlamps, Front Turn
Signal, Sidemarker, and
Parking Lamps
Driver Side Shown–PassengerSide Similar
1. Low/High-Beam Headlamp
2. Turn Signal
Headlamp
See your dealer for headlampreplacement.
Turn Signal
1. Open the hood.
2. If replacing a bulb on thepassenger side, remove theengine air cleaner.
3. 2500/3500 Series vehiclesonly, driver side:
3.1. Remove the auxiliarybattery retainer bolt (2)and battery retainer (1).
3.2. Reposition the auxiliarybattery (3) so that thefront turn signal accessport is visible.
4. Turn the bulb socketcounterclockwise to remove itfrom the headlamp assemblyand pull it straight out.
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5. Remove the bulb by pulling itstraight out of the bulb socket.
6. Install new bulb into bulbsocket.
7. Turn the bulb socket clockwiseto install it in the headlampassembly.
8. 2500/3500 Series vehiclesonly, driver side:
8.1. Reposition the auxiliarybattery (3).
8.2. Install the auxiliarybattery retainer (1) andbattery retainer bolt (3).
9. If replacing a bulb on thepassenger side, reinstall theengine air cleaner.
10. Close the hood.
Fog Lamps
To r e p l a c e t h e f r o n t f o g l a m p b u l b :
1. Locate the fog lamp under thefront bumper.
2. Disconnect the electricalconnector from the fog lampbulb assembly by pressing theconnector release.
3. Remove the bulb from thehousing by squeezing the tworelease tabs and pulling itstraight out of the assembly.
Taillamps (Chassis Cab
Models)
1. Back-Up Lamp
2. Stoplamp/Taillamp/TurnSignal Lamp
To r e p l a c e o n e o f t h e s e b u l b s :
1. Remove the four screws.
2. Lift the lens off the lampassembly.
3. Turn the old bulbcounterclockwise and pull itstraight out from the socket.
Taillamps, Turn Signal,
Stoplamps, and Back-Up
Lamps
1. Stoplamp/Taillamp/TurnSignal Lamp
2. Back-Up Lamp
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To r e p l a c e o n e o f t h e s e b u l b s :
1. Open the tailgate.
2. Remove the two rear lampassembly screws.
3. Pull the rear lamp assemblyoutboard away from the boxside until the retainers release.There will be a noise when theretainers release.
4. Pull the rear lamp assemblystraight back to remove it fromthe vehicle.
5. Turn the bulb socketcounterclockwise.
6. Pull the bulb straight out fromthe socket.
7. Replace the bulb, then insertthe bulb socket into the rearlamp assembly and turnclockwise.
8. Verify the retainer ring is in theproper position. If the retainerring is out of position, it will notengage. Reset the retainer bypulling it forward with a tool.
9. Push the rear lamp assemblystraight in until it is seatedagainst the vehicle.
10. Make sure the rear lampassembly is flush with thebox side.
11 . R e i n s t a l l t h e t w o r e a r l a m passembly screws.
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Center High-Mounted
Stoplamp (CHMSL) and
Cargo Lamp
1. Cargo Lamp Bulbs
2. Center High-MountedStoplamp (CHMSL) Bulb
To r e p l a c e o n e o f t h e s e b u l b s :
1. Remove the two screws and liftoff the lamp assembly.
2. Turn the bulb socketcounterclockwise and pull itstraight out.
3. Pull the bulb straight out fromthe socket.
Replacement Bulbs
For replacement bulbs, contact yourdealer.
Electrical System
High Voltage Devices and
Wiring
For an eAssist vehicle, see theSilverado/Sierra eAssistsupplement.
Electrical System
Overload
The vehicle has fuses to protectagainst an electrical systemoverload. Fuses also protect powerdevices in the vehicle.
Replace a bad fuse with a new oneof the identical size and rating.
If there is a problem on the road andafuseneedstobereplaced,thereare some spare fuses and a fusepuller in the Instrument Panel FuseBlock. The same amperage fusecan also be borrowed. Choosesome feature of the vehicle that isnot needed to use and replace it assoon as possible.
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Headlamp Wiring
An electrical overload may causethe lamps to go on and off, or insome cases to remain off. Have theheadlamp wiring checked right awayif the lamps go on and off orremain off.
Windshield Wipers
If the wiper motor overheats due toheavy snow or ice, the windshieldwipers will stop until the motor coolsand will then restart.
Although the circuit is protectedfrom electrical overload, overloaddue to heavy snow or ice maycause wiper linkage damage.Always clear ice and heavy snowfrom the windshield before using thewindshield wipers.
If the overload is caused by anelectrical problem and not snow orice, be sure to get it fixed.
Fuses
The wiring circuits in the vehicle areprotected from short circuits byfuses. This greatly reduces thechance of fires caused by electricalproblems.
Look at the silver-colored bandinside the fuse. If the band is brokenor melted, replace the fuse. Be sureyou replace a bad fuse with a newone of the identical size and rating.
Fuses of the same amperage canbe temporarily borrowed fromanother fuse location, if a fuse goesout. Replace the fuse as soon asyou can.
Engine Compartment
Fuse Block
If the vehicle has a diesel engine,see the Duramax dieselsupplement.
The engine compartment fuse blockis in the engine compartment, onthe driver side of the vehicle.
Lift the cover to access the fuseblock.
Caution
Spilling liquid on any electrical
component on the vehicle may
damage it. Always keep the
covers on any electrical
component.
Afusepullerisavailableintheleftinstrument panel fuse block.
The vehicle may not be equippedwith all of the fuses, relays, andfeatures shown.
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RelaysUsage
59 Fuel pump
60 Upfitter 2
61 Upfitter 3
62 Upfitter 4
63 Trailer parkinglamps
64 Run/Crank
65 Upfitter 1
66 Fuel pump 2
67 A/C control
68 Starter
69 Rear windowdefogger
70 Engine controlmodule
71 Cooling fan clutch
72 CKT 95
73 CKT 92
75 Fuel pump prime
Instrument Panel Fuse
Block (Right)
The right instrument panel fuseblock access door is on thepassenger side edge of theinstrument panel.
Pull off the cover to access the fuseblock.
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FusesUsage
39 Rear sliding window
42 Right door windowmotor
43 Front blower
44 SEO
45 Body control module 6
46 Body control module 7
47 Passenger seat
50 Retained accessorypower
51 Rear slidingwindow open
52 Rear sliding windowclose
Instrument Panel Fuse
Block (Left)
The left instrument panel fuse blockaccess door is on the driver sideedge of the instrument panel.
Pull off the cover to access the fuseblock.