2017 CHEVROLET SILVERADO wiring

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-9956065) - 2017 - CRC - 4/29/16
Driving and Operating 341
Trailer Brake Control Panel
1. Manual Trailer Brake ApplyLever
2. Trailer Gain AdjustmentButtons
The ITBC system has a controlpanel on the instrument panel to theleft of the steering column. SeeInstrument Panel06.Thecontrolpanel allows adjustment to theamount of output, referred to asTrailer Gain, available to the trailerbrakes and allows manualapplication of the trailer brakes. TheTrailer Brake Control Panel is usedalong with the Trailer Brake Display
Page on the Driver InformationCenter (DIC) to adjust and displaypower output to the trailer brakes.
Trailer Brake DIC Display Page
The ITBC system displaysmessages in the DIC.
The display page indicates TrailerGain setting, power output to thetrailer brakes, trailer connection, andsystem operational status.
To d i s p l a y t h e T r a i l e r B r a k e D i s p l a yPage, do any of the following:
.Scroll through the DIC menupages.
.Press a Trailer Gain button.If the Trailer Brake Display Pageis not currently displayed, pressaTrailerGainbuttontorecallthecurrent Trailer Gain setting.Each press and release of thegain buttons will then change theTrailer Gain setting.
.Activate the Manual TrailerBrake Apply Lever.
TRAILER GAIN: This setting can beadjusted from 0.0 to 10.0 with eitheratrailerconnectedordisconnected.
To a d j u s t t h e T r a i l e r G a i n , p r e s s o n eof the Trailer Gain Adjustmentbuttons. Press and hold a gainbutton to continuously adjust theTrailer Gain. To turn the output tothe trailer off, adjust the Trailer Gainsetting to 0.0 (zero).
TRAILER OUTPUT: This displaysanytime a trailer with electric brakesis connected. Output to the trailerbrakes is based on the amount ofvehicle braking present and relativeto the Trailer Gain setting. Output isdisplayed from 0 to 100% for eachgain setting.
The Trailer Output will indicate“------”on the Trailer BrakeDisplay Page whenever thefollowing occur:
.No trailer is connected.
.Atrailerwithoutelectricbrakesis connected (no DIC messagewill display).
.Atrailerwithelectricbrakeshasbecome disconnected (aCHECK TRAILER WIRINGmessage will also display onthe DIC).

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-9956065) - 2017 - CRC - 4/29/16
342 Driving and Operating
.There is a fault present in thewiring to the trailer brakes (aCHECK TRAILER WIRINGmessage will also display onthe DIC).
.The ITBC system is not workingdue to a fault (a SERVICETRAILER BRAKE SYSTEMmessage will also display inthe DIC).
Manual Trailer Brake Apply
The Manual Trailer Brake ApplyLever is used to apply the trailer’selectric brakes independent of thevehicle’sbrakes.Slidingthelevertothe left will apply only the trailerbrakes. Use this lever to adjustTrailer Gain to properly adjust thepower output to the trailer brakes.
The trailer's and the vehicle's brakelamps will come on when eithervehicle brakes or manual trailerbrakes are applied.
Trailer Gain Adjustment Procedure
Trailer Gain should be set for aspecific trailering condition and mustbe adjusted anytime vehicle loading,trailer loading, or road surfaceconditions change.
{Warning
Trailer brakes that are
over-gained or under-gained may
not stop the vehicle and the trailer
as intended and can result in a
crash. Always follow the
instructions to set the Trailer Gain
for the proper trailer stopping
performance.
Use the following to adjust TrailerGain for each towing condition:
1. Drive the vehicle with the trailerattached on a level roadsurface representative of thetowing condition and free oftraffic at about 32 to 40 km/h(20 to 25 mph) and fully applythe Manual Trailer Brake ApplyLever.
Adjusting Trailer Gain atspeeds lower than 32 to40 km/h (20 to 25 mph) mayresult in an incorrect gainsetting.
2. Adjust the Trailer Gain, usingthe Trailer Gain AdjustmentButtons, to just below the pointof trailer wheel lock-up,indicated by trailer wheelsqueal or tire smoke when atrailer wheel locks.
Trailer wheel lock-up may notoccur if towing a heavily loadedtrailer. In this case, adjust theTrailer Gain to the highestallowable setting for the towingcondition.
3. Readjust Trailer Gain anytimevehicle loading, trailer loading,or road surface conditionschange or if trailer wheellock-up is noticed at any timewhile towing.

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-9956065) - 2017 - CRC - 4/29/16
Driving and Operating 343
Other ITBC-Related DIC Messages
In addition to displaying TRAILERGAIN and OUTPUT through theDIC, trailer connection and ITBCsystem status are displayed onthe DIC.
TRAILER CONNECTED: Thismessage will briefly display when atrailer with electric brakes is firstconnected to the vehicle. Thismessage will automatically turn offin about 10 seconds. This messagecan be acknowledged before itautomatically turns off.
CHECK TRAILER WIRING: Thismessage will display if:
.The ITBC system firstdetermines connection to atrailer with electric brakes andthen the trailer harness becomesdisconnected from the vehicle.
If the disconnect occurs whilethe vehicle is stationary, thismessage will automatically turnoff in about 30 seconds. Thismessage will also turn off if it isacknowledged or if the trailerharness is reconnected.
If the disconnect occurs whilethe vehicle is moving, thismessage will continue until theignition is turned off. Thismessage will also turn off if it isacknowledged or if the trailerharness is reconnected.
.There is an electrical fault in thewiring to the trailer brakes. Thismessage will continue as longas there is an electrical fault inthe trailer wiring. This messagewill also turn off if it isacknowledged.
To d e t e r m i n e i f t h e e l e c t r i c a l f a u l t i son the vehicle side or trailer side ofthe trailer wiring harnessconnection:
1. Disconnect the trailer wiringharness from the vehicle.
2. Turn the ignition off.
3. Wait 10 seconds, then turn theignition back to RUN.
4. If the CHECK TRAILERWIRING message reappears,the electrical fault is on thevehicle side.
If the CHECK TRAILERWIRING message onlyreappears when connecting thetrailer wiring harness to thevehicle, the electrical fault is onthe trailer side.
SERVICE TRAILER BRAKESYSTEM: This message will displaywhen there is a problem with theITBC system. If this messagecontinues over multiple ignitioncycles, there is a problem with theITBC system. Have the vehicleserviced.
If either the CHECK TRAILERWIRING or SERVICE TRAILERBRAKE SYSTEM message displayswhile driving, the ITBC system maynot be fully functional or may notfunction at all. When trafficconditions allow, carefully pull thevehicle over to the side of the roadand turn the ignition off. Check thewiring connection to the trailer andturn the ignition back on. If either ofthese messages continues, eitherthe vehicle or trailer needs service.

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-9956065) - 2017 - CRC - 4/29/16
Driving and Operating 345
Conversions and
Add-Ons
Add-On Electrical
Equipment
{Warning
The Data Link Connector (DLC) is
used for vehicle service and
Emission Inspection/Maintenance
testing. SeeMalfunction Indicator
Lamp (Check Engine Light)
0138.Adeviceconnectedtothe
DLC—such as an aftermarket
fleet or driver-behavior tracking
device—may interfere with
vehicle systems. This could affect
vehicle operation and cause a
crash. Such devices may also
access information stored in the
vehicle’ssystems.
Caution
Some electrical equipment can
damage the vehicle or cause
components to not work and
would not be covered by the
vehicle warranty. Always check
with your dealer before adding
electrical equipment.
Add-on equipment can drain thevehicle's 12-volt battery, even if thevehicle is not operating.
The vehicle has an airbag system.Before attempting to add anythingelectrical to the vehicle, seeServicing the Airbag-EquippedVehicle086andAdding Equipmentto the Airbag-EquippedVehicle087.
For information on wiring auxiliaryswitches, see www.gmupfitter.comor contact your dealer.
Adding a Snow Plow or
Similar Equipment
Caution
Do not exceed 72 km/h (45 mph)
with a snow plow mounted to the
vehicle. The vehicle could
overheat and be damaged.
Before installing a snow plow on thevehicle, follow these guidelines:
Caution
If the vehicle does not have the
snow plow prep package, RPO
VYU, adding a plow can damage
the vehicle, and the repairs would
not be covered by the vehicle
warranty. Unless the vehicle was
built to carry a snow plow, do not
add one to the vehicle. If the
vehicle has RPO VYU, then the
payload the vehicle can carry will
be reduced when a snow plow is
installed. The vehicle can be
(Continued)

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-9956065) - 2017 - CRC - 4/29/16
348 Driving and Operating
For example, adding a 318 kg(700 lb) snow plow actually addsmore than 318 kg (700 lb) to thefront axle. Using the formula, if thesnow plow is 122 cm (4 ft) in front ofthe front axle and the wheelbase is305 cm (10 ft), then:W=318kg(700lb)A=122cm(4ft)W.B. = 305 cm (10 ft)
(W x (A + W.B.)/W.B. =(318 x (122 + 305))/305 = 445 kg(980 lb)
This means if the front axle reservecapacity is more than 445 kg(980 lb), the snow plow could beadded without exceeding thefront GAWR.
Heavier equipment can be added onthe front of the vehicle if less cargoor fewer passengers are carried,or by positioning cargo toward therear. This reduces the load on thefront. However, the front GAWR,rear GAWR, and Gross VehicleWeight Rating (GVWR) must neverbe exceeded.
{Warning
On some vehicles that have
certain front mounted equipment,
such as a snow plow, it may be
possible to load the front axle to
the front Gross Axle Weight
Rating (GAWR) but not have
enough weight on the rear axle to
have proper braking performance.
If the brakes cannot work
properly, the vehice could crash.
Always follow the snow plow
manufacturer or installer's
recommendation for rear ballast
to ensure a proper front and rear
weight distribution ratio.
Maintaining a proper front and
rear weight distribution ratio is
necessary to provide proper
braking performance.
To t a l v e h i c l e r e s e r v e c a p a c i t y i s t h edifference between the GVWR andthe weight of the truck with full fueland passengers. It is the amount ofweight that can be added to thevehicle before reaching the GVWR.Reserve capacity numbers are
intended as a guide when selectingthe amount of equipment or cargothe truck can carry. If unsure of thevehicle's front, rear, or total weight,go to a weigh station and weigh thevehicle. Your dealer can also helpwith this.
The total vehicle reserve capacityfor the vehicle is in the lower rightcorner of the Certification/Tire labelas shown previously.
See your dealer for additionaladvice and information about usingasnowplowonthevehicle.Also,seeVehicle Load Limits0259.
Emergency Roof Lamp
Provisions
Vehicles with the RPO VYU snowplow prep package also have anemergency roof lamp provisionpackage, RPO TRW. Wiring for theemergency roof lamp is providedabove the overhead console. SeeAuxiliary Roof-Mounted Lamp0176for switch location.

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-9956065) - 2017 - CRC - 4/29/16
350 Vehicle Care
Vehicle Care
General Information
General Information . . . . . . . . . . 351California Proposition65 Warning . . . . . . . . . . . . . . . . . 351California PerchlorateMaterials Requirements . . . . . 352Accessories andModifications . . . . . . . . . . . . . . . . 352
Vehicle Checks
Doing Your OwnService Work . . . . . . . . . . . . . . . 353Hood . . . . . . . . . . . . . . . . . . . . . . . . . 353Engine CompartmentOverview . . . . . . . . . . . . . . . . . . . . 354Engine Oil . . . . . . . . . . . . . . . . . . . . 359Engine Oil Life System . . . . . . . 362Automatic Transmission Fluid(6-Speed Transmission) . . . . . 363Automatic Transmission Fluid(8-Speed Transmission) . . . . . 366Manual Transmission Fluid . . . 366Hydraulic Clutch . . . . . . . . . . . . . . 366Engine Air Cleaner/Filter . . . . . . 367Cooling System . . . . . . . . . . . . . . 368Engine Coolant . . . . . . . . . . . . . . . 369Engine Overheating . . . . . . . . . . 372
Overheated Engine ProtectionOperating Mode . . . . . . . . . . . . . 374Engine Fan . . . . . . . . . . . . . . . . . . . 374Power Steering Fluid (1500Series) . . . . . . . . . . . . . . . . . . . . . . 375Power Steering Fluid (2500/3500 Series) . . . . . . . . . . . . . . . . 375Washer Fluid . . . . . . . . . . . . . . . . . 375Brakes . . . . . . . . . . . . . . . . . . . . . . . 376Brake Fluid . . . . . . . . . . . . . . . . . . . 377Battery - North America . . . . . . 378Four-Wheel Drive . . . . . . . . . . . . . 379Front Axle . . . . . . . . . . . . . . . . . . . . 380Rear Axle . . . . . . . . . . . . . . . . . . . . 380Noise Control System . . . . . . . . 382Starter Switch Check . . . . . . . . . 383Automatic Transmission ShiftLock Control FunctionCheck . . . . . . . . . . . . . . . . . . . . . . . 383Ignition Transmission LockCheck . . . . . . . . . . . . . . . . . . . . . . . 383Park Brake and P (Park)Mechanism Check . . . . . . . . . . 384Wiper Blade Replacement . . . . 384Glass Replacement . . . . . . . . . . 385
Headlamp Aiming
Headlamp Aiming . . . . . . . . . . . . 385
Bulb Replacement
Bulb Replacement . . . . . . . . . . . . 385
Halogen Bulbs . . . . . . . . . . . . . . . . 385High Intensity Discharge (HID)Lighting . . . . . . . . . . . . . . . . . . . . . 386LED Lighting . . . . . . . . . . . . . . . . . 386Headlamps, Front Turn Signal,Sidemarker, and ParkingLamps . . . . . . . . . . . . . . . . . . . . . . 386Fog Lamps . . . . . . . . . . . . . . . . . . . 387Ta i l l a m p s ( C h a s s i s C a bModels) . . . . . . . . . . . . . . . . . . . . . 387Ta i l l a m p s , T u r n S i g n a l ,Stoplamps, and Back-UpLamps . . . . . . . . . . . . . . . . . . . . . . 387Center High-MountedStoplamp (CHMSL) andCargo Lamp . . . . . . . . . . . . . . . . . 389Replacement Bulbs . . . . . . . . . . . 389
Electrical System
High Voltage Devices andWiring . . . . . . . . . . . . . . . . . . . . . . . 389Electrical System Overload . . . 389Fuses . . . . . . . . . . . . . . . . . . . . . . . . 390Engine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . 390Instrument Panel Fuse Block(Right) . . . . . . . . . . . . . . . . . . . . . . 393Instrument Panel FuseBlock (Left) . . . . . . . . . . . . . . . . . 395

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-9956065) - 2017 - CRC - 4/29/16
Vehicle Care 389
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.

Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-9956065) - 2017 - CRC - 4/29/16
390 Vehicle Care
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.