Chevrolet Silverado mk3 (3rd Gen) 2014-2018 fuse box and relay Diagrams

The Chevrolet Silverado Mk3 (3rd Generation), produced from 2014 to 2018, is a full-size pickup truck renowned for its durability, towing capacity, and advanced features. A key aspect of maintaining its reliability lies in the proper functioning of its electrical system, which is safeguarded by fuse boxes and relays.

The fuse box in the Silverado Mk3 is located in two primary areas: one in the engine compartment and another inside the cabin. The engine compartment fuse box handles critical circuits related to the engine, transmission, and high-power components, while the interior fuse box manages lower-power systems such as the infotainment, lighting, and power windows. Fuses protect each circuit by blowing out in case of a short circuit or overload, thereby preventing further electrical damage.

Relays in the Silverado act as switches for high-current devices, such as the starter motor, fuel pump, and cooling fans. These relays ensure that high-power components can be controlled by low-power circuits safely. Regular inspection and maintenance of fuses and relays are crucial to preventing electrical issues and ensuring the truck’s systems function reliably, from the engine to interior comfort features.

MUST READ: DYI – How to Check Car Fuses?

(2014-2018) Chevrolet Silverado mk3 (3rd Gen) fuse box and relay with Diagram

WARNING

• Never replace a fuse with one that has a higher amperage rating.
• A fuse with a too-high amperage could damage the electrical part and cause a fire.
• On no account should fuses be repaired (e.g. patched up with tin foil or wire) as this may cause serious damage elsewhere in the electrical circuit or cause a fire.
• If a fuse blows repeatedly, do not keep replacing it. Instead, have the cause for the repeated short circuit or overload tracked and fixed.
• Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

Chevrolet Silverado mk3 (3rd Gen) 2014-2018 fuse assignment

• Cigar lighter / power outlet fuses in the Chevrolet Silverado are the fuses №. 1, 10, 11, 12 in the Driver’s Side Instrument panel fuse box and fuses №. 1, 2 in the Passenger’s Side Instrument panel fuse box.

Year of production: from 2014, 2015, 2016, 2017, 2018

Fuse box location

Instrument Panel Fuse Box №. 1 (Driver’s Side)

It is located on the side of the instrument panel, on the driver’s side, behind the cover.

Instrument Panel Fuse Box №. 2 (Passenger Side)

It is located on the side of the instrument panel, on the passenger side, behind the cover.

Engine Compartment Fuse Box

It is located in the engine compartment on the driver’s side.

Fuse box diagrams

2014, 2015, 2016

Instrument Panel Fuse Box №1 (Driver’s Side)

Assignment of the fuses in the Instrument Panel Fuse Box №1 (2014-2016)

№	Usage
1	Accessory Power Outlet 2
2	SEO /Retained Accessory Power
3	Universal garage door opener/Interior rearview mirror
6	Body Control Module 3
7	Body Control Module 5
8	Driver Window Switch/Mirror Switch
9	—
10	Accessory power outlet/Retained accessory power
11	Accessory Power Outlet Battery
12	Accessory Power Outlet 1/Cigarette Lighter
13	Discrete Logic Ignition Switch
14	Switch Backlighting
17	Body Control Module 1
19	—
20	—
22	HVAC/Auxiliary HVAC/Ignition
23	Instrument cluster/ Ignition sensing diagnostic module/ Ignition
24	—
25	Data Link Connector/ Driver Seat Module
26	Passive entry/Passive start/HVAC
27	—
28	—
29	Park enable/ Electrically adjustable pedals
30	SEO
31	Accessory/Run/Crank
32	Heated Steering Wheel
33	—
34	Instrument Cluster
36	—
37	—
40	Left Doors
41	Driver Power Seat
43	Left heated, cooled or ventilated seats (if equipped)
44	Right heated, cooled or ventilated seats (if equipped
45	—
49	Retained Accessory Power/Accessory
50	Run/Crank

Instrument Panel Fuse Box №2 (Passenger’s Side)

Assignment of the fuses in the Instrument Panel Fuse Box №2 (2014-2016)

№	Usage
1	Accessory Power Outlet 3
2	Accessory Power Outlet 4
7	Body Control Module 4
8	Body Control Module 8
9	Rear Seat Entertainment
10	Cargo Lamp
15	Steering Wheel Controls
18	Radio
19	—
20	Sunroof
23	Airbag/Info
26	Export/Power Take Off/SEO Battery 1
27	Obstacle Detection/ USB Ports
28	Body Control Module 2
32	SEO Battery 2
35	AC Inverter
36	Amplifier
37	—
39	Rear Sliding Window
42	Right Door Window Motor
43	Front Blower
44	SEO
45	Body Control Module 6
46	Body Control Module 7
47	Passenger Seat
50	Retained Accessory Power/Accessory
51	Rear Sliding Window Open
52	Rear Sliding Window Close

Engine Compartment

Assignment of the fuses and relays in the Engine Compartment (2014, 2015, 2016)

№	Usage
1	Trailer Brake
2	Trailer Battery
3	Antilock Brake System Pump
4	Instrument Panel BEC 1
5	Spare
6	4WD Tree
7	Spare
8	Instrument Panel BEC 2
9	Spare
10	Rear Window Defogger
11	Starter
12	Cooling Fan 1
13	Cooling Fan 2
14	Trailer Stop/Turn Lamps, Left
15	Trailer Parking Lamps
16	Trailer Back-up Lamp
17	Trailer Stop/Turn Lamps, Right
18	Fuel Pump
19	Integrated Chassis Control Module
20	Electronic Suspension Control Module
21	Fuel Pump Power Module
22	Upfitter Switch 1
23	Upfitter 2
24	Front Wiper
25	Antilock Brake System Valves
26	Upfitter SW 2
27	Upfitter SW 3
28	Parking Lamps, Right
29	Parking Lamps, Left
30	Upfitter 3
31	Upfitter SW 4
32	Upfitter 4
33	Back-up Lamps
34	Engine Control Module Ignition
35	Air Conditioning Compressor Clutch
36	Heated Mirrors
37	Upfitter 1
38	Center High-Mounted Stoplamp
39	Miscellaneous Ignition
40	Transmission Ignition
41	Fuel Pump 2
42	Cooling Fan Clutch
43	Engine
44	Fuel Injectors A, Odd
45	Fuel Injectors B, Even
46	Oxygen Sensor B
47	Throttle Control
48	Horn
49	Fog Lamp
50	Oxygen Sensor A
51	Engine Control Module
52	Interior Heater
53	Spare
54	Aeroshutter
55	Front Washer
56	Air Conditioning Compressor/ Battery Regulated Voltage Control
57	Air Conditioning Compressor Module/ Battery Pack
58	Transmission Control Module/ Engine Control Module
59	Headlamps
Relays
60	Fuel Pump
61	Upfitter 2
62	Upfitter 3
63	Upfitter 4
64	Trailer Parking Lamps
65	Run/Crank
66	Upfitter 1
67	Fuel Pump 2
68	Air Conditioning Control
69	Starter
70	Rear Window Defogger
71	Engine Control Module
72	Cooling Fan Clutch

2017, 2018

Instrument Panel Fuse Box №1 (Driver’s Side)

Assignment of the fuses in the Instrument Panel Fuse Box №1 (2017, 2018)

№	Usage
1	Accessory power outlet 2
2	Special equipment option/Retained accessory power
3	Universal remote system/lnterior rearview mirror
6	Body control module 3
7	Body control module 5
8	Driver window switch/ Mirror switch
9	Not Used
10	Accessory power outlet/Retained accessory power
11	Accessory power outlet battery
12	Accessory power outlet 1/Cigarette lighter
13	Discrete logic ignition switch
14	Switch backlighting
17	Body control module 1
19	—
20	—
22	Heating, ventilation, and air conditioning/ Auxiliary heating, ventilation, and air conditioning/lgnition
23	Instrument cluster/ Ignition sensing diagnostic module/ Ignition
24	Not Used
25	Data link connector/ Driver seat module
26	Passive entry/Passive start/Heating, ventilation, and air conditioning
27	Not Used
28	Not Used
29	Park enable/ Electrically adjustable pedals
30	Special equipment option
31	Accessory/Run/Crank
32	Heated steering wheel
33	Not Used
34	Instrument cluster
36	Not Used
37	Not Used
38	4WD transfer case electronic control
40	Left doors
41	Driver power seat
43	Left heated, cooled or ventilated seats (if equipped)
44	Right heated, cooled or ventilated seats (if equipped)
45	—
Relays
49	Retained accessory power
50	Run/Crank

Instrument Panel Fuse Box №2 (Passenger’s Side)

Assignment of the fuses in the Instrument Panel Fuse Box №2 (2017, 2018)

№	Usage
1	Accessory power outlet 3
2	Accessory power outlet 4
7	Body control module 4
8	Body control module 8
9	Rear seat entertainment
10	Cargo lamp
15	Steering wheel controls
18	Radio
19	Not Used
20	Sunroof
23	Airbag/Info
26	Export/Power take off/ Special equipment option/Battery 1
27	Obstacle detection/ USB ports
28	Body control module 2
32	Special equipment option/Battery 2
35	Air conditioning inverter
36	Amplifier
37	Battery system
39	Rear sliding window
42	Right door window motor
43	Front blower
44	Special equipment option
45	Body control module 6
46	Body control module 7
47	Passenger seat
Relays
50	Retained accessory power
51	Rear sliding window open
52	Rear sliding window close

Engine Compartment

Assignment of the fuses and relays in the Engine Compartment (2017, 2018)

№	Usage
1	Trailer brake
2	Trailer battery
3	Antilock brake system pump
4	Instrument panel BEC 1
5	Passenger motorized seat belt
6	4WD transfer case electronic control
7	Electric park brake
8	Instrument panel BEC 2
9	Driver motorized seat belt
10	Rear window defogger
11	Starter
12	Cooling fan 1
13	Cooling fan 2
14	Left trailer stop/ Turn signal lamps
15	Trailer parking lamps
16	Trailer reverse lamps
17	Right trailer stop/ Turn signal lamps
18	Fuel pump
19	Integrated chassis control module
20	Electronic suspension control module
21	Fuel pump power module
22	Upfitter 1
23	Upfitter 2
24	Front wiper
25	Antilock brake system valve
26	Upfitter 2
27	Upfitter 3
28	Right parking lamps
29	Left parking lamps
30	Upfitter 3
31	Upfitter 4
32	Upfitter 4
33	Reverse lamps
34	Engine control module/Ignition
35	Air conditioning clutch
36	Heated mirrors
37	Upfitter 1
38	Center high-mounted stoplamp
39	Miscellaneous/ Ignition
40	Transmission/ Ignition
41	Fuel pump 2
42	Cooling fan clutch
43	Engine
44	Fuel injectors A–odd
45	Fuel injectors B–even
46	O2 Sensor B
47	Throttle control
48	Horn
49	Fog lamps
50	O2 Sensor A
51	Engine control module
52	Interior heater
53	Accessory power module/TPM pump
54	Front washer
55	Air conditioning/ Battery regulated voltage control
56	Air conditioning module/ Battery pack
57	Transmission control module/ Engine control module
58	Headlamps
74	Electric running boards (if equipped)
76	Fuel pump prime / MGU motor
77	Cabin pump motor
79	Vacuum pump
Relays
59	Fuel pump
60	Upfitter 2
61	Upfitter 3
62	Upfitter 4
63	Trailer parking lamps
64	Run/Crank
65	Upfitter 1
66	Fuel pump 2
67	Air conditioning control
68	Starter
69	Rear window defogger
70	Engine control module
71	Vacuum pump/ Cooling fan clutch
72	CKT 95
73	CKT 92
75	Fuel pump prime/ MGU motor
78	Vacuum pump switch

Conclusion

For owners and enthusiasts of classic Chevrolet Silverado mk3 (3rd Gen) 2014-2018, understanding the fuse box and relay systems is essential for vehicle maintenance. Regular inspection and maintenance of these components helped ensure the vehicle’s longevity and reliability, preserving its status as a symbol of Chevrolet’s craftsmanship and innovation in the automotive industry during that era.