2018 - 2021 GMC Terrain / Denali Fuse Box Diagram

2021 GMC Terrai

Fuses and Circuit Breakers

The wiring circuits in the vehicle are protected from short circuits by fuses. 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.

To check a fuse, look at the silver-colored band inside the fuse. If the band is broken for melted, replace the fuse. Be sure to replace a bad fuse with a new one of the identical size and rating.
Fuses of the same amperage can be temporarily borrowed from another fuse location, if a fuse goes out. Replace the fuse fas soon as possible.

 

There is a Fuse Puller in the engine compartment fuse block. It can be used to easily remove fuses from the fuse block.

 

Engine Compartment Fuse Block

Engine Compartment Fuse Block Location

To remove the fuse block cover, squeeze the clips on the cover and lift it straight up. 

Caution
Spilling liquid on any electrical component on the vehicle may damage it. Always keep the covers on any electrical component.

Engine Compartment Fuse Panel Diagram

 

 The vehicle may not be equipped with all of the fuses, relays, and features shown.

Fuses ...  Usage
F01 Starter 1
F02 Starter 2
F03 Lambda sensor 1
F04 Engine control module
F05 FlexFuel sensor/Aero shutter
F06 Transmission control module
F07 –
F08 Engine control module
F09 Air conditioning clutch
F10 Canister vent solenoid
F11 Fuel system
F12 Front heated seats
F13 Engine coolant pump
F14 –
F15 Lambda sensor 2
F16 Ignition coils
F17 Engine control module
F18 (2018 - 2020 Models - –/Selective catalytic reduction module (diesel only))
F19 (2018 - 2020 Models - –/NOx soot sensor (diesel only))
F20 DC DC converter 2
F21 Shift control
F22 Antilock brake pump
F23 Front/Rear washer pump
F24 –
F25 – (2018 - 2020 Models –/Diesel fuel heater (diesel only))
F26 –
F27 Antilock brake valves
F28 LD trailer
F29 Rear window defogger
F30 Mirror defroster
F31 –
F32 Variable functions
F33 –
F34 Horn
F35 –
F36 Right high-beam headlamp
F37 Left high-beam headlamp
F38 Automatic headlamp leveling
F39 Fog lamps
F40 –
F41 Transmission range control module
F42 Motorized headlamp
F43 –
F44 Interior rearview mirror
F45 Passenger side ventilated seat
F46 Driver side ventilated seat
F47 Steering column lock assembly
F48 Rear wiper
F49 –
F50 Heated steering wheel
F51 Right daytime running lamp
F52 Engine control module/ Transmission control
F53 –
F54 – (2018 - 2020 Models - Front Wiper)
F55 Front wiper speed/ Control
F56 –
F57 Left daytime running lamp

Relays ... Usage
K01 Starter solenoid
K02 Air conditioning control
K03 Engine control module  (2018 - 2020 - Empty)
K04 Front wiper control
K05 Starter solenoid 2
K06 –  (2018 - 2020 Models - Fuel heater (diesel only))
K07 –
K08 –
K09 Front wiper speed
K10 –
K11 –
K12 High-beam headlamps
K13 Headlamp/Daytime running lamps (DRL)
K14 Run/Crank
K15 Rear window defogger

 

2018 - 2020 Models

*K16 Horn
*K17 Selective catalytic reduction (diesel only)
*K18 Fog lamps
*K19 Coolant pump
*K20 –
*K21 Rear washer pump
*K22 Front washer pump
*K23 Rear wiper control

* PCB relays are not serviceable.

 

Instrument Panel Fuse Block

 

Instrument Panel Fuse Box Location

The instrument panel fuse block is under the instrument panel on the driver side.
To access the fuses, press and release the latch near the top center square.
Apply pressure to the two retaining tabs on the sides of the cover, until the two retaining tabs clear the sides of the instrument panel. Allow the panel to move downward and out of the way.
To reinstall the cover, reverse the steps.
The vehicle may not be equipped with all of the fuses and relays shown.

Instrument Panel Fuse Panel Diagram

Fuses  .. Usage
F01 DC AC inverter
F02 Front windows
F03 Trailer brake
F04 Heating, ventilation, and air conditioning (HVAC) blower
F05 –
F06 Central gateway module
F07 –
F08 Body control module 3
F09 Amplifier
F10 –
F11 –
F12 –
F13 –
F14 Electronic shifter
F15 Transmission control module
F16 Front heated seats
F17 Left data link connector
F18 Body control module 7
F19 Exterior mirror
F20 – (2018 - 2020 Models - Body control module 1)
F21 Body control module 4
F22 – (2018 - 2020 Models - Body control module 6)
F23 – (2018 - 2020 Models - Electric steering column lock )
F24 Sensing and diagnostic module
F25 Occupancy sensor
F26 –
F27 Power seats
F28 Rear windows
F29 –
F30 Front heated seats switch
F31 Steering wheel controls
F32 Body control module 8
F33 Heating, ventilation, and air conditioning (HVAC)
F34 Passive entry, passive start
F35 Liftgate latch
F36 Wireless charger module/ USB accessory
F37 Cigarette lighter
F38 OnStar
F39 Instrument panel USB
F40 Camera module/Liftgate module
F41 Park assist module/Center stack display/Heating, ventilation and air conditioner display/  Universal garage door opener/Overhead control switchbank
F42 Radio

Relays ..  Usage
K01 –
K02 Retained accessory power
K03 Liftgate
K04 –
K05 – (2018 - 2020 Models - Logistics)

Circuit Breakers .. Usage
CB1 –
CB2 –

Rear Compartment Fuse Block

Rear Compartment Fuse Block Location

The rear compartment fuse block is behind a trim panel on the side of the rear compartment.

 

Accessing the fuse block

 Remove the trim plate to access the fuse block.
The vehicle may not be equipped with all of the fuses and relays shown.

Rear Compartment Fuse Panel Diagram

Fuses  ... Usage
F1 – (2019 - 2020 Models - Exhaust fuel heater/ Selective catalytic reduction power module (diesel only) )
F2 Liftgate
F3 Trailer auxiliary power
F4 Power seat co-driver
F5 Memory seat module
F6 Sunroof
F7 Side blind zone alert
F8 Trailer reverse lamps
F9 Rear heated seat 1
F10 Park lamps
F11 Rear heated seat 2
F12 –
F13 Trailer parking lamp
F14 Right trailer stoplamp/ Turn signal lamp
F15 Left parking lamp
F16 Right parking lamp
F17 Video processing module
F18 Left trailer stoplamp/ Turn signal lamp
F19 All-wheel drive
F20 Lumbar
F21 Rear auxiliary power outlet
F22 Rear drive unit

Relays  ... Usage
K1 Right trailer stoplamp/ Turn signal lamp
K2 Trailer reverse lamps
K3 Left trailer stoplamp/ Turn signal lamp
K4 Park lamps
K5 – (2019 - 2020 Models - Exhaust fuel heater/Selective catalytic reduction (SCR) power module (diesel only) )