Chevrolet Silverado 4500HD User manual

Table of Contents
General Information ........................... 1-1
General Information . .. . . . . . . . . . . . . . . .. . . . . . . . . . 1-3
Body Systems .................................. 2-1
Air Compressor - Auxiliary. .. . . . . . . . . . . . . . . . . . . 2-3
Fixed and Moveable Windows . . .. . . . . . . . . . . . . . 2-5
Horns and Pedestrian Alerts . . . . . . . . . . . . . . . . . 2-13
Lighting....................................... 2-16
Mirrors........................................ 2-41
Trailering Systems . . .. . . . . . . . . . . . . . . . . . . . . . . . . 2-47
Vehicle Access. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-56
Wipers and Washers .. .. . . . . . . . . . . . . . . . . . . . . . 2-66
Brakes .......................................... 3-1
Park Brake..................................... 3-3
Driver Information and Entertainment . . . . . . . 4-1
Image Display Cameras . .. . . . . . . . . . . . . . . . . . . . . 4-3
Engine/Propulsion ............................. 5-1
12 V Starting and Charging . .. . . . . . . . . . . . . . . . . . 5-3
HVAC ............................................ 6-1
HVAC - Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Power and Signal Distribution . .. . . . . . . . . . . . . . 7-1
Electrical Component and Inline Harness
Connector End Views . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Power Outlets .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-427
Wiring Systems and Power
Management .. . . .. . . . . . . . . . . . . . . . . . .. . . . . . . 7-435
Transmission ................................... 8-1
Power Take-Off................................ 8-3
Shift Lock Control . . . .. . . . . . . . . . .. . . . . . . . . . . .. . 8-12
INDEX.................................INDEX-1
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual

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2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual

Table of Contents 1-1
Section 1
General Information
General Information ........................... 1-3
Introduction .......................................1-3
Vehicle, Engine and Transmission ID and VIN
Location, Derivative and Usage . . . . . . . . . . . . . . . . 1-3
Vehicle Certification Label . . . . . . . . . . . . . . . . . . . . . . . 1-4
RPO Code List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual

1-2 Table of Contents
BLANK
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual

General Information 1-3
General Information
Introduction
Vehicle, Engine and Transmission ID
and VIN Location, Derivative and
Usage
5028742
The vehicle identification number (VIN) plate is the
legal identifier of the vehicle. The VIN plate is located
on the upper left corner of the instrument panel. The
VIN number can be seen through the windshield from
the outside of the vehicle:
Vehicle Identification Number (VIN) System
Position Definition Character Description
1 Country of Origin 1 United States
2 Manufacturer H Navistar, Inc.
3 Vehicle Brand/Type A Chevrolet Incomplete
4–5 Make/Model/Series/Type KH GM GM515 GM Conventional SFA 4x2
KJ GM GM515 GM Conventional SFA 4x4
6–7 Engine Type PV RPO L5D - Engine Diesel, 8 Cyl, 6.6L, DI, V8, Turbo,
Duramax, GEN 5, VAR. 3
8 GVWR/Brake System
H Class 4: 14,001 –16,000 lbs./Hydraulic
K Class 5: 16,001 –19,500 lbs./Hydraulic
M Class 6: 19,501 –26,000 lbs./Hydraulic
9 Check Digit 0~9,X Calculated by POMS
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual

1-4 General Information
Vehicle Identification Number (VIN) System (cont'd)
Position Definition Character Description
10 Model Year M 2021
11 Plant Location H Springfield, Ohio
12–17 Plant Sequence Number —Plant Sequence Number
6.6L (L5D) Engine ID and VIN Derivative Location
Engine Identification
Vehicle Certification Label
4991554
Vehicle Certification Label
Callout Description
A vehicle-specific Certification label is attached to the driver-side door frame and displays the following assessments:
1 Name of Manufacturer
2 Gross Weight Rating of the Front Axle
3 Location Vehicle was Assembled In
4
Final Date of Manufacture (Month and Year MM/YY)
Date of manufacture is to reflect the date that the vehicle is counted as built. In those cases where a replacement
label is needed, the replacement label should reflect the actual build date not the date of replacement.
5 Tire Size Front Axle
6 Rim Size Front Axle
7 Maximum Gross Vehicle Weight Rating (GVWR)
8 Tire Pressure Front Axle Dual (Cold)
9 Tire Pressure Rear Axle Dual (Cold)
10 Tire Pressure Front Axle Single (Cold)
11 Tire Pressure Rear Axle Single (Cold)
12 Certification Statement
13 Rim Size Rear Axle
14 Vehicle Class Type (Pass Car, etc.)
15 Tire Size Rear Axle
16 Gross Weight Rating of the Rear Axle
17 Vehicle Identification Number (VIN)
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual

General Information 1-5
RPO Code List
The following table provides the description of the
Regular Production Option (RPO) codes that are
available on the vehicle. The vehicle's RPO list is
printed on the Service Parts Identification Label.
RPO Description
005 RATIO-4.56 (4 5/9)
008 RATIO-4.88
01U PRIMARY COLOR-EXTERIOR,
SPECIAL (02)
02U PRIMARY COLOR-EXTERIOR, SPECIAL,
CHART NOT REQUIRED
066 RATIO-4.10 (4 1/10)
092 RATIO-4.3
1LT PACKAGE-LT OPTION 1
1WT PACKAGE-WT OPTION 1
379 SEAT BELT COLOR-ORANGE (02)
3F9 SEAT BELT COLOR-RED (01)
4AA INTERIOR TRIM-JET BLACK
4D7 INTERIOR TRIM-JET BLACK/DK ASH
5D1 BUMPER FRT-PAINTED GRAY
5DX PROVISIONS-ELEC - UPFITTER, REAR
OF CAB
5DY PROVISIONS-ELEC - UPFITTER, REAR OF
FRAME
5H1 KEY-SINGLE KEY SYSTEM, 2
SPARE KEYS
5HP KEY-SINGLE KEY SYSTEM, 6 SPARE
KEYS (SEO)
5P0 PROVISIONS-ENGINE SHUTDOWN
5T5 SEAT OVERRIDE-(SEO)
6E2 CYLINDER UNIT-SINGLE KEY SYSTEM,
CODED, VAR. 1 (SEO)
6E8 CYLINDER UNIT-SINGLE KEY SYSTEM,
CODED, VAR 2 (SEO)
6Y5 ORNAMENTATION-EXTR, EMBLEM, NON-
INSTALLED
719 SEAT BELT COLOR-BLACK (10)
7Y7 BATTERY-1100 CCA, DUAL BATTERY
SYSTEM
7Y8 BATTERY-1300 CCA, DUAL BATTERY
SYSTEM
7Y9 BATTERY-2250 CCA, THREE BATTERY
SYSTEM
8E4 FUEL-ADDITIONAL - 5 GALLONS
8E8 BUMPER FRT-PAINTED, BLACK
8F2 ORNAMENTATION-NONE
8H5 BUMPER FRT-NONE
8X8 LABEL INFORMATION-LABEL, FASTEN
SEAT BELTS (SEO)
9B9 GOVERNOR-VEHICLE TOP SPEED LIMIT -
70 MPH (SEO)
9C2 GOVERNOR-VEHICLE TOP SPEED LIMIT -
65 MPH (SEO)
RPO Description
9D4 GOVERNOR-VEHICLE TOP SPEED LIMIT -
55 MPH (SEO)
9D6 GOVERNOR-VEHICLE TOP SPEED LIMIT -
79 MPH (SEO)
9D7 GOVERNOR-VEHICLE TOP SPEED LIMIT -
75 MPH (SEO)
9D9 MIRROR I/S R/V-(NONE)
9G8
EQUIPMENT-DAYTIME RUNNING LAMP &
HEADLAMPS CONTROL - NONE (SEO)
(DO NOT USE AFTER MY23)
9L3 TIRE SPARE-NONE
9L7 EQUIPMENT-ACSRY WRG JUNC BLK
9S1 TRIM OVERRIDE-VINYL COVERING, SEAT
(2 PASSENGER) (SEO)
9U3 TRIM OVERRIDE-CLOTH COVERING,
SEAT (2 PASSENGER) (SEO)
9V5 COLOR-WOODLAND GREEN (SEO)
9W3 COLOR-WHEATLAND YELLOW, LEAD
FREE (SEO)
9W4 COLOR-TANGIER ORANGE, LEAD
FREE (SEO)
A31
WINDOW-POWER OPERATED, ALL
DOORS (DO NOT USE ON NEW/MAJOR
PROGRAMS)
A52 SEAT-FRT BENCH
A68 SEAT RR-SPLIT, FOLDING
A95 SEAT-FRT BKT, HIGH BACK, DRIVER &
PASS RECL
AAC PARTS PKG-SHIPPED LOOSE
ACO IDENTIFICATION-ACCESSORY CATALOG
OFFERING
AE7 SEAT-FRT SPLIT, DRIVER, PASS
AG1
ADJUSTER FRT ST-POWER, MULTI-
DIRECTIONAL, DRIVER (DO NOT USE ON
NEW PROGRAMS AFTER MY18)
AKO WINDOW TYPE-PRIVACY
AKP WINDOW TYPE-SOLAR ABSORBING
ANC SALES PACKAGE-SHUTTLE BUS
ANK SALES PACKAGE-NON-CONFORMING
SCHOOL BUS
APL SEAT PASSENGER-(NONE)
AQQ
LOCK CONTROL, ENTRY-REMOTE
ENTRY, EXTENDED RANGE (MY 09 AND
FUTURE)
ATZ SEAT RR-NONE
AU3 LOCK CONTROL-SIDE DR, ELEC
AY0
RESTRAINT SYSTEM-SEAT, INFLATABLE,
DRIVER & PASS FRT, SEAT SIDE,
ROOF SIDE
AY1
RESTRAINT SYSTEM-SEAT, INFLATABLE,
DRIVER ONLY FRT, SEAT SIDE,
ROOF SIDE
BG9 COVERING FLOOR-RUBBER
BTN EQUIPMENT-POST BATTERY, THREADED
BTV REMOTE START-VEHICLE
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual

1-6 General Information
RPO Description
C49 DEFOGGER-RR WINDOW, ELECTRIC
C5B GVW RATING-15,000 LBS
C5D GVW RATING-22,500 LBS (10,206 KG)
C67 HVAC SYSTEM-AIR CONDITIONER FRT,
ELECTRONIC CONTROLS
C7P GVW RATING-16,000 LBS
C7R GVW RATING-16,500 LBS
C7Y GVW RATING-14,001 LBS
C99 SWITCH-INFL RST I/P MDL MAN
SUPPRESSION
C9U GVW RATING-22,940 LBS (10,387 KG)
CV3 COUNTRY-MEXICO
D07 CONSOLE-FRT COMPT, FLOOR, CUSTOM
DB9 GVW RATING-23000 LBS (10433 KG)
DD4 GVW RATING-17,000 LBS
DD5 GVW RATING-21,000 LBS
DD7 GVW RATING-23,500 LBS
DD8 MIRROR I/S R/V-LT SENSITIVE
DF2 MIRROR O/S-LH & RH, WIDE LOAD,
FOLDING, STAINLESS STEEL
DGD
MIRROR O/S-MAN ADJ, MAN FOLD, FLAT/
DRVR, FLAT/PASS, WFOV DRVR/PASS,
102" (SEO)
DGL
MIRROR O/S-MAN ADJ, MAN FOLD, FLAT/
DRVR, FLAT/PASS, WFOV DRVR/PASS,
96" (SEO)
DH6
MIRROR I/S FRT VAN-LH & RH,
SUNSHADE, ILLUM (DO NOT USE NEXT
NEW MAJOR)
DP9 MIRROR PROVISIONS-HOUSING,
CHROME
DPN
MIRROR O/S-LH & RH, WIDE LOAD,
VERTICAL GLASS, MAN EXTENDING,MAN
FOLDING, HEATED, TURN SIG IND,
REMOTE CONTROL
DRZ MIRROR I/S R/V-LT SENSITIVE, FULL
VIDEO DISPLAY
E01 STEPS-ASSIST
E0N STEPS-ASSIST ALUMINUM
E20 HANDLE O/S DOOR-CHROME
ED5 WHEELBASE-201 INCH
ED9 WHEELBASE-165 INCH
EF7 COUNTRY-UNITED STATES OF
AMERICA (USA)
EM1 WHEELBASE-199 INCH
EQB WHEELBASE-219 INCH
ER2 WHEELBASE-189 INCH
F0C AXLE END FRAME-49 INCH
F0D AXLE END FRAME-63 INCH
F0G AXLE END FRAME-83 INCH
F0I AXLE END FRAME-75 INCH
F0K AXLE END FRAME-91 INCH
RPO Description
F59 STABILIZER SHAFT FRT-
F95 SUSPENSION FRONT-6,000 LB,
TAPERED LEAF
FBC WHEELBASE-243 INCH
FF3 SEAL-OIL, WHEEL FRT
FG0 HUB-FRONT, OIL FILLED SYNTHETIC
FHX VEHICLE FUEL-DIESEL B20
FK6 SUSPENSION FRONT-7,000 LB,
TAPERLEAF, I-BEAM
FN1 AXLE REAR-10,000 LB (4,536KG)
FNP FENDERS-FRONT EXTENSIONS -
PAINTED
FNV WHEELBASE-175 INCH
FNX FENDERS-FRONT EXTENSIONS
FPF EQUIPMENT-EMISSION-DIESEL DPF
MANUAL REGENERATION
FPN WHEELBASE-231 INCH
FQT WHEELBASE-141 INCH
FRP WHEELBASE-235 INCH
FSN SUSPENSION FRONT-8,000 LB (3,629 KG),
TAPERED LEAF
FTA AXLE FRONT-7,000 LB., FRONT NON
DRIVING
FTB AXLE FRONT-7,500 LB., FRONT DRIVING
FTD AXLE FRONT-6,000 LB., FRONT NON
DRIVING
FTL AXLE FRONT-8,000 LB., FRONT NON
DRIVING
FTN LUBRICANT-FRT AXLE, SYNTHETIC
FTO LUBRICANT-RR AXLE, SYNTHETIC
FTV
SUSPENSION FRONT-7,500 LB, TAPERED
LEAF, SHACKLE TYPE, PARABOLIC
SPRING
FU7 SUSPENSION REAR-15,500 LB (7,031 KG),
MULTILEAF
G1K PRIMARY COLOR-EXTERIOR, SACR'E
BLUE MET(409Y)
G2X PRIMARY COLOR-EXTERIOR, HAVANA
MET-1 (439C)
G40 SUSPENSION REAR-12,000 LB, AIR
G68 SHOCK ABSORBERS-RR, HD, TRUCK
G7C PRIMARY COLOR-EXTERIOR, PULL ME
OVER RED SOLID (130X)
G80 AXLE POSITRACTION-LIMITED SLIP
G86 AXLE-LIMITED SLIP
G9K PRIMARY COLOR-EXTERIOR, SATIN
STEEL GRAY MET-3 (464C)
GA0 PRIMARY COLOR-EXTERIOR, SOME
KINDA BLUE MET -1 (619D)
GAN PRIMARY COLOR-EXTERIOR,
SWITCHBLADE SILVER MET (G) 636R
GAZ PRIMARY COLOR-EXTERIOR, SUMMIT
WHITE (G) 8624
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual

General Information 1-7
RPO Description
GB8 PRIMARY COLOR-EXTERIOR, BLACK
MEET KETTLE MET (384A)
GBA PRIMARY COLOR-EXTERIOR, BLACK
(G) 8555
GH5 EQUIPMENT ADDITIONAL-CANADA
GJI PRIMARY COLOR-EXTERIOR, DARK
SHADOW MET -1 (626D)
GL4 AXLE REAR-11,000 LB (4,990 KG)
GP1 SUSPENSION REAR-13,500 LB, AIR
GP8 SUSPENSION REAR-15,500 LB, AIR
GPA PRIMARY COLOR-EXTERIOR, GASOLINE
MET-2 (457B)
GR3 SUSPENSION REAR-11,000 LB (4,990 KG),
MULTILEAF
GR4 SUSPENSION REAR-13,500 LB,
MULTILEAF
GS6 PRIMARY COLOR-EXTERIOR, SCORPION
MET -1 (634D)
GZG GVW RATING-19,500 LBS
GZH GVW RATING-21,500 LBS
GZJ GVW RATING-18,000 LBS
GZX GVW RATING-17,500 LBS
H0U INTERIOR TRIM CONFIG-CLOTH, LEVEL
2, JET BLACK
H2Q INTERIOR TRIM CONFIG-VINYL, LEVEL 1,
JET BLACK /DK ASH
H2R INTERIOR TRIM CONFIG-CLOTH, LEVEL
1, JET BLACK/ DK ASH
H2S INTERIOR TRIM CONFIG-CLOTH, LEVEL
2, JET BLACK / DK ASH
HD1 AXLE REAR-15,000 LB (6,804 KG),
DANA S130
HD2 AXLE REAR-13,500 LB (6,124 KG),
DANA S110
IO3 RADIO-INFOTAINMENT SYSTEM -
BASE HMI
IO5
RADIO-INFOTAINMENT SYSTEM -
UPLEVEL HMI, ENHANCED
CONNECTIVITY
IO6
RADIO-INFOTAINMENT SYSTEM -
UPLEVEL HMI, ENHANCED
CONNECTIVITY, EMBEDDED NAVIGATION
IOB
RADIO-INFOTAINMENT SYSTEM -
MIDLEVEL HMI, MIDLEVEL
CONNECTIVITY
ITT MARKET BRAND-INTERNATIONAL TRUCK
J21 ENGINEERING YEAR-2021
J27 AXLE REAR-15,500LB
J48
BRAKE SYSTEM-HYDRAULIC, HEAVY
DUTY STSTEM, ABS (DNU NEXT NEW
MAJOR)
J69 BRAKE PARKING-MECHANICALLY
OPERATED
JG1 SHAFT-PROP, ALUMINUM
RPO Description
JL1 BRK APL CTRL FEATURE-INTEGRATED
TRAILER BRAKE
JPY AIR DRYER-HEATED
JPZ VALVE-AIR SUSPENSION AIR RELEASE
JTR
PROVISIONS-TAIL LAMP - WIRING
HARNESS SPECIAL (DO NOT USE,
SEE BFO)
K05 HEATER ENG-BLOCK
K34 CRUISE CONTROL-AUTOMATIC,
ELECTRONIC
K40 ENGINE BRAKE-EXHAUST
K4C CHARGER-INDUCTIVE PORTABLE
WIRELESS DEVICE
KA1 HEATER SEAT FRT-DRVR & PASS
KBG SHIFT CONTROL-AUTOMATIC
TRANSMISSION, FUEL SENSE BASIC
KBK SHIFT CONTROL-AUTOMATIC
TRANSMISSION, PERFORMANCE
KG4 GENERATOR-150 AMP
KHB GENERATOR-150 AMP AND 220
AMP, DUAL
KI4 RECEPTACLE I/P-ELECTRICAL, 110 VOLT
KL6
PROVISIONS-TAIL LAMP, LOCATION
INSIDE OF FRAME (DO NOT USE,
SEE BFO)
KT0 HOSE-HEATER, SILICONE
KUD CLAMP-HEATER HOSE, BELLEVILLE
WASHER TYPE
KUT AIR COMPRESSOR-ACCESSORY DRIVE
KW5 GENERATOR-220 AMP
L5D ENGINE-DIESEL, 8 CYL, 6.6L, DI, V8,
TURBO, DURAMAX, GEN 5, VAR. 3
LVA GOVERNOR-VEHICLE TOP SPEED LIMIT -
60 MPH (SEO)
MA6 TRANSMISSION-AT6, A1700PTS
MB6 TRANSMISSION-AT6, A2700PTS
MBV TRANSMISSION-AT6, A2750RDS
MBW TRANSMISSION-AT6, A2750MH
MBX TRANSMISSION-AT6, A2750HS
MBY TRANSMISSION-AT6, A2750EVS
ME0
TRANSMISSION-AUTO 6 SPD, ALLISON,
A1750MH, 3.10 1ST 1.80 2ND, 1.40 3RD,
1.00 4TH, 0.70 5TH, 0.60 6TH GEN 1
MF0
TRANSMISSION-AUTO 6 SPD, ALLISON,
A2700MH, 3.10 1ST 1.80 2ND, 1.40 3RD,
1.00 4TH, 0.70 5TH, 0.60 6TH GEN 1
MG0
TRANSMISSION-AUTO 6 SPD, ALLISON,
A2700EVS, 3.10 1ST 1.80 2ND, 1.40 3RD,
1.00 4TH, 0.70 5TH, 0.60 6TH GEN 1
MH1
TRANSMISSION-AUTO 6 SPD, ALLISON,
A1700EVS, 3.10 1ST 1.80 2ND, 1.40 3RD,
1.00 4TH, 0.70 5TH, 0.60 6TH GEN 1
MHV
TRANSMISSION-AUTO 6 SPD, ALLISON,
A1750EVS, 3.10 1ST 1.80 2ND, 1.40 3RD,
1.00 4TH, 0.70 5TH, 0.60 6TH GEN 1
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual

1-8 General Information
RPO Description
MI0
TRANSMISSION-AUTO 6 SPD, ALLISON,
A1750RDS, 3.10 1ST 1.80 2ND, 1.40 3RD,
1.00 4TH, 0.70 5TH, 0.60 6TH GEN 1
MIA
TRANSMISSION-AUTO 6 SPD, ALLISON,
A2700RDS, 3.10 1ST 1.80 2ND, 1.40 3RD,
1.00 4TH, 0.70 5TH, 0.60 6TH GEN 1
MIU
TRANSMISSION-AUTO 6 SPD, ALLISON,
A1700RDS, 3.10 1ST 1.80 2ND, 1.40 3RD,
1.00 4TH, 0.70 5TH, 0.60 6TH GEN 1
MIX
TRANSMISSION-AUTO 6 SPD, ALLISON,
A1700MH, 3.10 1ST 1.80 2ND, 1.40 3RD,
1.00 4TH, 0.70 5TH, 0.60 6TH GEN 1
MJ0
TRANSMISSION-AUTO 6 SPD, ALLISON,
A1750HS, 3.10 1ST 1.80 2ND, 1.40 3RD,
1.00 4TH, 0.70 5TH, 0.60 6TH GEN 1
MTZ
PROVISIONS-TAIL LAMP, LOCATION
OUTSIDE OF FRAME (DO NOT USE,
SEE BFO)
MWA
TRANSMISSION-AUTO 6 SPD, ALLISON,
A1700HS, 3.10 1ST, 1.80 2ND, 1.40 3RD,
1.00 4TH, 0.70 5TH, 0.60 6TH, GEN 1
MWB
TRANSMISSION-AUTO 6 SPD, ALLISON,
A2700HS, 3.10 1ST,1.80 2ND,1.40 3RD,
1.00 4TH,0.70 5TH,0.60 6TH, GEN 1
N12 EXHAUST SYSTEM-REAR EXIT
N2L FUEL TANK-REAR TANK 40 GAL (151L)
N33 STEERING COLUMN-TILT TYPE
N4C CERTIFICATION-EMISSION, USA 50
STATE
N4E EMISSION SYSTEM-USA, 50 STATE
NAV PLANT CODE-NAVISTAR, SPRINGFIELD,
OH, USA
NK5 STEERING WHEEL-STANDARD
NP5 STEERING WHEEL-LEATHER WRAPPED
NPJ EXHAUST SYSTEM-SIDE EXIT, LH
NPK EXHAUST SYSTEM-SIDE EXIT, RH
NPR EXHAUST SYSTEM-SIDE EXIT, RH,
LOCATION BEHIND REAR WHEEL
NQF TRANSFER CASE-ELECTRIC SHIFT
CONT, TWO SPEED, ALUM
NSQ FUEL TANK-DUAL, FRONT 25 GAL (94.6L),
REAR 40 GAL (151L)
NVK FUEL TANK-FRONT, 25 GAL (94.6L)
NXG FUEL-ADDITIONAL - 20 GALLON
NXO FUEL-ADDITIONAL- 40 GALLONS
NZZ SALES PACKAGE-SKID PLATE, "OFF
ROAD" SPORT
P0D GUARD-GRILLE SCREEN - INSECT
PROTECTION
P0E GUARD-GRILLE SCREEN - EMBER
PD7 WHEEL SPARE-(NONE)
PTO ENGINE CONTROL-POWER TAKE OFF
(PTO) CONTROLS
PTX ENGINE CONTROL-POWER TAKE-OFF
(PTO), CONTROLS - NONE
PWQ WHEEL-19.5 X 6.75, J, STEEL, DESIGN 1
RPO Description
PWR WHEEL-19.5 X 6.75, J, STEEL, DESIGN 2
PWS WHEEL-19.5 X 6.75, J, STEEL, DESIGN 3
PWV WHEEL-19.5 X 6.75, J, ALUMINUM,
DESIGN 1
PWY WHEEL SPARE-19.5 X 6.75, J, STEEL,
DESIGN 1
PWZ WHEEL SPARE-19.5 X 6.75, J, ALUMINUM,
DESIGN 1, FRONT
PXB WHEEL SPARE-19.5 X 6.75, J, ALUMINUM,
DESIGN 1, REAR
Q91 CAP-VALVE, TIRE, AIR-THRU DESIGN 1
Q92 CAP-VALVE, TIRE, AIR-THRU DESIGN 2
RDI ACCESSORY-KEYLESS ENTRY
RWI ACCESSORY-BODY SIDE MOLDINGS -
CHROME
RWK ACCESSORY-BODY SIDE MOLDINGS -
PAINTED
RWR ACCESSORY-CAMERA - REAR VISION
RY7 ACCESSORY-DOOR HANDLES -
ALTERNATE FINISH 1
S0P ACCESSORY-INSERT - FLOOR CONSOLE
S6M ACCESSORY-RADIO KIT - NAVIGATION
S6P ACCESSORY-REMOTE START KIT
S6W ACCESSORY-SEAT COVER - MUDDER
(PROTECTIVE)
S6Z ACCESSORY-SEAT COVER - TAILORED -
ALTERNATE MATERIAL
SFJ ACCESSORY-WINDOW SHADES -
REFLECTIVE
SFV ACCESSORY-WIRELESS NETWORK
INTERFACE MODULE
SFW CALIBRATION-BACK UP ELECTRICAL
ALARM (SEO)
SIF ACCESSORY-RSE - PORTABLE MEDIA
CONNECTIVITY PACKAGE
SYT ACCESSORY-SILL PLATES - ALTERNATE
FINISH
T3A BUMPER PROVISIONS-FRONT, 4"
EXTENSION
T3U LAMP FRT FOG-FRT FOG
T3V LAMP-CHMSL - CENTER HIGH MOUNT
STOP LIGHT
TG5 PLAYER-COMPACT DISC AND MP3
TGK COLOR COMBINATION-SOLID, SPECIAL
PAINT
TR1 LAMP-TAIL & STOP (DO NOT USE,
SEE BFO)
TRW PROVISIONS-LAMP, ROOF MOUNTED
U01 LAMP-FIVE, ROOF MARKER, TRUCK
U04 HORN-SINGLE NOTE
U05 HORN-DUAL
U19 SPEEDOMETER-INST, KILO & MILES, KILO
ODOMETER
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual

General Information 1-9
RPO Description
U2J DIGITAL AUDIO SYSTEM-S-BAND - NONE
U2K DIGITAL AUDIO SYSTEM-S-BAND
U73 ANTENNA-FIXED, RADIO
UDA COMMUNICATION SYSTEM-VEHICLE,
DEACTIVATED
UDC DISPLAY INSTRUMENT-DRIVER INFO
ENHANCED (ONE COLOR GRAPHIC)
UDD
DISPLAY INSTRUMENT-DRIVER INFO
ENHANCED (MULTI COLOR STANDARD
GRAPHIC)
UE0 COMMUNICATION SYSTEM-VEHICLE -
NONE (DO NOT USE NEXT NEW MAJOR)
UE1 COMMUNICATION SYSTEM-VEHICLE,
ONSTAR
UEA TAIL LAMP-(NONE) (DO NOT USE,
SEE BFO)
UEH PROVISIONS-ELECTRICAL SWITCH
BANK (SEO)
UF3 SWITCH-HIGH IDLE
UGE LAMP-RR TAIL, LED (DO NOT USE,
SEE BFO)
UH4 SWITCH-HEADLINER SWITCH BANK
UK3 CONTROL-STEERING WHEEL,
ACCESSORY
UMN SPEEDOMETER-INST, MILES & KILO,
MILES ODOMETER
UNL EQUIPMENT-AUX, 3' FRONT HEAD/
TURN LAMP
UQ3 SPEAKER SYSTEM-ENHANCED AUDIO
UQ5 SPEAKER SYSTEM-4, DUAL FRT DR MTD,
DUAL EXTD RGE QTR MNTD
UTJ THEFT DETERENT-ELECTRICAL,
UNAUTHORIZED ENTRY
UTQ ALARM, HORN-CONTENT THEFT
DETERENT, DISABLED (SEO)
UVC VISION-REAR VIEW, MONO, ANALOG
UY7 WIRING HARNESS-TRUCK TRAILER, HD
UZF ALARM B/U-ELECTRICAL,
V22 GRILLE-RADIATOR, CHROME
V23 GUARD-GRILLE SCREEN - STONE
PROTECTION
V33 TOOL KIT-ROAD, EMERGENCY
V46 BUMPER FRT-CHROME
V76 HOOK-TOW
V8C VEHICLE STATEMENT-VEHICLE LABEL
CONTENT - NO CERT STATEMENT
V8D VEHICLE STATEMENT-VEHICLE LABEL
CONTENT - U.S. FMVSS
VBJ ACCESSORY-UNDERSEAT STORAGE
VK3 LICENSE PLATE FRONT-FRT
MOUNTING PKG
VKW ACCESSORY-ORGANIZER - FRONT
CONSOLE
RPO Description
VKY ACCESSORY-DOOR HANDLES -
ALTERNATE FINISH - CHROME
VND GOVERNOR-VEHICLE TOP SPEED LIMIT -
50 MPH (SEO)
VT7 OWNERS MANUAL-ENGLISH LANGUAGE
VTG ACCESSORY-INTERIOR TRIM KIT
VTS OWNERS MANUAL-SPANISH LANGUAGE
VV4 COMMUNICATION EQUIP-MOBILE
INTERNET CONNECTIVITY
VWX GRILLE-BASE VEHICLE
VXT VEHICLE TYPE-INCOMPLETE
VYU PROVISIONS-SNOW PLOW PREP
WC2 SALES PACKAGE-RENTAL SALES
PACKAGE
WFZ SALES PACKAGE-LEASE SALES
PACKAGE
WMU VIN MODEL YEAR-2021
WN9 PROCESSING-SPECIAL DELIVERY
REQUSTED, NOT LEAD UNIT
WOJ ACCESSORY-DOOR COVER - PET
PROTECTOR - DESIGN 1
WRD WIRING PROVISIONS-UPFITTER
X88 MARKET BRAND-CHEVROLET
XDK TIRE FRONT-225/70R19.5 G 126/128 L BW
HWY GDY
XDL TIRE FRONT-225/70R19.5 G 126/128 N BW
HWY CTL
XDV TIRE FRONT-225/70R19.5 H 130/128 L BW
HWY CTL
XDY TIRE FRONT-225/70R19.5 G 126/128 N BW
TL GDY
XHD TIRE FRONT-225/70R19.5 G 128 N BW
TRN CTL
XL7 FREQUENCIES RATING-315 MHZ, LONG
DISTANCE
YAL TIRE REAR-225/70R19.5 G 126/128 L BW
HWY GDY
YAM TIRE REAR-225/70R19.5 G 126/128 N BW
HWY CTL
YAO TIRE REAR-225/70R19.5 G 126/128 N BW
TL GDY
YAP TIRE REAR-225/70R19.5 H 130/128 L BW
HWY CTL
YE9 PACKAGE, CONVENIENCE-COMFORT &
DECOR LEVEL #3
YF2 SALES PACKAGE-AMBULANCE UPFITTER
YHD TIRE REAR-225/70R19.5 G 128 N BW
TRN CTL
YM8 IDENTIFICATION-LIMITED
PERSONALIZATION OPTION (LPO)
ZBC TIRE SPARE-225/70R19.5 H 130/128 L BW
HWY CTL
ZBK TIRE SPARE-225/70R19.5 G 126/128 L BW
HWY GDY
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual

1-10 General Information
RPO Description
ZBP TIRE SPARE-225/70R19.5 G 126/128 N BW
TL GDY
ZBR TIRE SPARE-225/70R19.5 G 126/128 N BW
HWY CTL
ZHD TIRE SPARE-225/70R19.5 G 128 N BW
TRN CTL
ZY1 COLOR COMBINATION-SOLID
ZY2 COLOR COMBINATION-TWO TONE
ZY3 COLOR COMBINATION-TWO TONE,
SPECIAL
ZY4 COLOR COMBINATION-TWO TONE,
DELUXE
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual

Table of Contents 2-1
Section 2
Body Systems
Air Compressor - Auxiliary.................... 2-3
Schematic and Routing Diagrams ...............2-3
Auxiliary Air Compressor Schematics . . . . . . . . . . . . 2-4
Fixed and Moveable Windows ................ 2-5
Moveable Window Schematics . . . . . . . . . . . . . . . . . . 2-6
Defogger Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Description and Operation ......................2-10
Power Windows Description and Operation . . . . 2-10
Rear Window Defogger Description and
Operation ...................................... 2-11
Horns and Pedestrian Alerts ................ 2-13
Schematic and Routing Diagrams ..............2-13
HornSchematics ............................... 2-14
Description and Operation ......................2-15
Horns System Description and Operation . . . . . . 2-15
Lighting ........................................ 2-16
Schematic and Routing Diagrams ..............2-16
Headlights/Daytime Running Lights (DRL)
Schematics .................................... 2-17
Fog Lights Schematics . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
Exterior Lights Schematics . . . . . . . . . . . . . . . . . . . . . 2-20
Interior Lights Schematics . . . . . . . . . . . . . . . . . . . . . . 2-28
Interior Lights Dimming Schematics . . . . . . . . . . . . 2-32
Description and Operation ......................2-37
Exterior Lighting Systems Description and
Operation ...................................... 2-37
Interior Lighting Systems Description and
Operation ...................................... 2-39
Mirrors ......................................... 2-41
Schematic and Routing Diagrams ..............2-41
Inside Rearview Mirror Schematics . . . . . . . . . . . . . 2-42
Outside Rearview Mirror Schematics . . . . . . . . . . . 2-43
Description and Operation ......................2-45
Automatic Day-Night Mirror Description and
Operation ...................................... 2-45
Outside Mirror Description and Operation . . . . . . 2-45
Trailering Systems ........................... 2-47
Schematic and Routing Diagrams ..............2-47
Trailering Systems Schematics . . . . . . . . . . . . . . . . . 2-48
Description and Operation ......................2-51
Trailering Description and Operation . . . . . . . . . . . 2-51
Vehicle Access ............................... 2-56
Schematic and Routing Diagrams ..............2-56
Door Lock/Indicator Schematics . . . . . . . . . . . . . . . . 2-57
Hood Latch Schematics . . . . . . . . . . . . . . . . . . . . . . . . 2-62
Description and Operation ......................2-63
Door Ajar Indicator Description and
Operation ...................................... 2-63
Hood Ajar Indicator Description and
Operation ...................................... 2-63
Power Door Locks Description and
Operation ...................................... 2-63
Wipers and Washers ......................... 2-66
Schematic and Routing Diagrams ..............2-66
Wiper/Washer Schematics . . . . . . . . . . . . . . . . . . . . . . 2-67
Description and Operation ......................2-69
Wiper/Washer System Description and
Operation ...................................... 2-69
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual

2-2 Table of Contents
BLANK
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual

Air Compressor - Auxiliary 2-3
Air Compressor - Auxiliary
Schematic and Routing Diagrams
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual

2-4 Air Compressor - Auxiliary
Auxiliary Air Compressor Schematics (Air Dryer (JPY))
5531782
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual

Air Compressor - Auxiliary 2-5
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual

Fixed and Moveable Windows 2-5
Fixed and Moveable Windows
Schematic and Routing Diagrams
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual

2-6 Fixed and Moveable Windows
Moveable Window Schematics (Driver Door (A31))
5531783
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual

Fixed and Moveable Windows 2-7
Moveable Window Schematics (Passenger Door (A31))
5531784
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual