Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC2021TERRAIN SLT, 4WDREPAIR AND DIAGNOSISELECTRICALBODY ELECTRICALELECTRICAL COMPONENT LOCATOR AND HARNESS ROUTING VIEWS
2021 GMC Terrain SLT, 4WD
Electrical Component Locator And Harness Routing Views
2021 GMC Terrain SLT, 4WDSECTION Electrical Component Locator And Harness Routing Views
- Schematic Wiring Diagrams
- Harness Routing Views
- Front Fascia Harness Routing (Chevrolet)
- Front Fascia Harness Routing (GMC)
- Forward Lamp Harness Routing
- Cooling Fan Harness Routing
- Fuel Injector Harness Routing - Rear of the Engine (LTG)
- Engine Harness Routing - Left Front of the Engine (LTG)
- Engine Harness Routing - Left Front of Engine (LYX)
- Engine Harness Routing - Left Rear of Engine (LYX)
- Engine Harness Routing - Right Front of Engine (LYX+F48)
- Engine Compartment Harness Routing - Left Side of the Engine Compartment
- Engine Compartment Harness Routing - Right Side of the Engine Compartment
- Instrument Panel Harness Routing (Chevrolet)
- Instrument Panel Harness Routing (GMC)
- Inside Rear View Mirror Harness Routing
- Rain/Ambient Light Sensor Module Harness Routing (CE1)
- HVAC Harness Routing
- Console Harness Routing (Chevrolet)
- Console Harness Routing (GMC)
- Headliner Harness Routing
- Rear Roof Antenna Cable Routing
- Driver Seat Harness Routing (1 of 2)
- Driver Seat Harness Routing (2 of 2)
- Passenger Seat Harness Routing (1 of 2)
- Passenger Seat Harness Routing (2 of 2)
- Left Rear Seat Harness Routing
- Right Rear Seat Harness Routing
- Body Harness Routing - Left Front of the Passenger Compartment
- Body Harness Routing - Right Front of the Passenger Compartment
- Driver Door Trim Panel Harness Routing (Chevrolet)
- Driver Door Trim Panel Harness Routing (GMC)
- Driver Door Harness Routing (Chevrolet)
- Driver Door Harness Routing (GMC)
- Passenger Door Trim Panel Harness Routing (Chevrolet)
- Passenger Door Trim Panel Harness Routing (GMC)
- Passenger Door Harness Routing
- Body Harness Routing - Left Rear of the Passenger Compartment
- Body Harness Routing - Right Rear of the Passenger Compartment
- Left Rear Door Harness Routing
- Right Rear Door Harness Routing
- Body Harness Routing - Underbody
- Body Harness Routing - Left Rear Underbody
- Body Harness Routing - Right Rear Underbody
- Fuel Tank Harness Routing
- Liftgate Harness Routing (Chevrolet)
- Liftgate Harness Routing (GMC)
- Rear Chassis Harness Routing
- Rear Fascia Harness Routing
- License Lamp Harness Routing (GMC)
- Harness Routing Views
- Component Locator
- Front of Vehicle/Engine Compartment Component Views
- Powertrain Component Views
- Top of the Engine (LTG) 1 of 2
- Top of the Engine (LTG) 2 of 2
- Right Front of the Engine (LTG)
- Rear of the Engine (LTG)
- Left Rear of the Engine (LTG)
- Top of the Engine (LYX)
- Right Front of the Engine (LYX)
- Front of the Engine/Heated Oxygen Sensor (LYX+MNK)
- Rear of the Engine (LYX)
- Bottom of Engine (LYX)
- Right Front of the Transmission (M3D/M3H/M3U)
- Right Rear of the Transmission (MNH/MNK)
- Left Front of the Transmission/Input Speed Sensor (MNH/MNK)
- Left Front of the Transmission (MNH/MNK)
- Left Front of the Transmission/Transmission Range Control Module (EPH)
- Power Transfer Unit Shift Actuator (F48)
- Instrument Panel/Center Console Component Views
- Instrument Panel and Shift Lever
- Middle of the Instrument Panel/Accent Lighting
- Left Side of the Instrument Panel
- Right Side of the Instrument Panel/Accent Lighting
- Behind the Instrument Panel (Chevrolet)
- Behind the Instrument Panel (GMC)
- Lower Left of the Instrument Panel/Data Link Connector
- Steering Wheel (GMC with UVD) 1 of 2
- Steering Wheel (GMC with UVD) 2 of 2
- Electrical Component Locator And Harness Routing Views
- Steering Wheel (Chevrolet) 2 of 2
- Steering Wheel Controls
- HVAC Assembly
- Top and Rear of the Center Console (Chevrolet)
- Top and Rear of the Center Console (GMC)
- Front of the Center Console (GMC)
- Front of the Center Console Storage Compartment
- Rear of the Center Console Storage Compartment
- Underneath the Center Console
- Passenger Compartment/Roof Component Views
- Front of the Passenger Compartment
- Left Front of the Passenger Compartment (1 of 2)
- Left Front of the Passenger Compartment (2 of 2)
- Inside Rearview Mirror
- Rain/Ambient Light Sensor Module (CE1)
- Under the Center Console/Keyless Entry Antenna
- Under the Center Console/Inflatable Restraint and Body Control Module
- Right Side of the Passenger Compartment
- Driver Seat (1 of 3)
- Driver Seat (2 of 3)
- Driver Seat (3 of 3)
- Passenger Seat (1 of 4)
- Passenger Seat (2 of 4)
- Passenger Seat (3 of 4)
- Passenger Seat (4 of 4)
- Left Rear Seat
- Right Rear Seat
- Headliner (C3U)
- Headliner (except C3U)
- Rear Roof Antenna
- Left Rear of the Passenger Compartment
- Right Rear of the Passenger Compartment
- Door Component Views
- Luggage Compartment/Rear of Vehicle Component Views
- Front Luggage Compartment
- Left Side of the Luggage Compartment
- Upper Right Rear of the Luggage Compartment
- Left Rear of the Vehicle
- Rear of the Vehicle/Behind the Fascia
- Rear Luggage Compartment/Inside of the Liftgate
- Rear of the Vehicle/Liftgate
- Rear of the Vehicle/Fascia
- Rear of the Vehicle/Trailer Connector (V92)
- Wheels/Vehicle Underbody Component Views
- Ground Views
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.