Which wires give constant, ignition and ground on a 2023 GMC Terrain?
On a 2023 GMC Terrain, take constant power from the Gray/Brown or Red/Gray wire at the blue 27-pin plug on the body control module, pin 1, ignition from the Purple/Black wire at the green 25-pin plug on the body control module, pin 6, and ground to clean, bare body metal. Meter every wire first.
Meter every wire before you tap it. Colors change with trim and build date.
OBD-II port:Under the dash, driver sideBest power spot:Body control moduleSystem voltage:12VIgnition type:Push-button (this page)
Where do I get constant, ignition and ground on a 2023 GMC Terrain?
Constant and ignition are on the body control module plugs under the driver dash.
Option 1 Main power
Body control module
Driver side, under the dash.
Constant
Gray/Brown or Red/Gray
Blue 27-pin plug on the body control module, pin 112V battery feed. Fortin lists two possible colors, so meter it.
Ignition
Purple/Black
Green 25-pin plug on the body control module, pin 6Hot with the button on.
Ground
Body ground
Bare metal under the dashNo ground color printed. Never the battery negative post.
The start button wire is Blue/Green on pin 17. Never tap it.
Option 2 Backup
Fuse tap
For accessory power.
Accessory
Fuse tap
Interior fuse panelNot in the guide. Find a slot that is hot only in accessory and run.
Use an add-a-fuse.
From Fortin's install guide for the 2018 to 2023 Terrain with push-button start (guide 61281).
Where are the turn signal, reverse and light wires on a 2023 GMC Terrain for advanced 360 multicam and video telematics installs?
Circuit
Wire color
Location and what it does
Left turnNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Right turnNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Park lightNegative -Not yet checked
Green/Gray
White 26-pin plug on the body control module, pin 22Ground when the parking lights are on.
HeadlightNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
ReverseNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Dome lightNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Each chip shows the main insulation color with its stripe. Source: Fortin's install guide for the 2018 to 2023 Terrain with push-button start (guide 61281).
Where are the brake, door, speed and CAN wires on a 2023 GMC Terrain for advanced 360 multicam and video telematics installs?
Circuit
Wire color
Location and what it does
CAN dataDataNot yet checked
Green (single wire)
Blue 27-pin plug on the body control module, pin 22Single-wire GM data bus. Never cut or splice it.
DoorsNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
BrakePositive +Not yet checked
Blue/Yellow
Blue 27-pin plug on the body control module, pin 712V when the brake pedal is pressed.
Parking brakeNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Vehicle speedNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Source: Fortin's install guide for the 2018 to 2023 Terrain with push-button start (guide 61281). Wires marked Not found were not in the guide.
Where are the fuse boxes and ground points on a 2023 GMC Terrain?
Driver dashBody control moduleConstant, ignition, park light, CAN.
DashInterior fuse panelAccessory by fuse tap.
Ground pointsBare body metalNever the battery negative post.
Locations from Fortin's install guides.
Where is the OBD-II port on a 2023 GMC Terrain?
OBD II
Diagnostic portOBD-II port: under the dash, driver sidePlug-in GPS trackers and OBD harnesses connect here. Check the port before you plan the install.
Which years share wiring with the 2023 GMC Terrain?
This page2023GMC Terrain.
Same wiring2018, 2019, 2020, 2021, 2022Fortin uses the same guide for these years.
Other years2013, 2014, 2015, 2016, 2017Different colors. Check the page for your year.
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This page covers the 2023 GMC Terrain compact SUV with push-button start.
The wire colors come from Fortin's install guide, read wire by wire. Our own team has not yet metered these on a 2023 Terrain.
Written by API Signal, fleet GPS and camera installers for 35+ years across Georgia, South Carolina and North Carolina, installing every major telematics and camera brand. Every wire on this page lists its source.
Test every wire with a meter before you tap it
No wiring information is ever guaranteed. Colors and locations change with trim, options and build date, and the manufacturer can change them in the middle of a model year. We share this as a starting point for installers, and you are responsible for confirming every connection on the vehicle in front of you.
Common questions about 2023 GMC Terrain wiring
What wire is constant power on a 2023 GMC Terrain?
Gray/Brown or Red/Gray at the blue 27-pin plug on the body control module, pin 1. 12V battery feed. Meter it before you tap it.
What wire is ignition on a 2023 GMC Terrain?
Purple/Black at the green 25-pin plug on the body control module, pin 6. Hot with the button on. Meter it before you tap it.
Where is the brake wire on a 2023 GMC Terrain?
Blue/Yellow (positive +) at the blue 27-pin plug on the body control module, pin 7. 12V when the brake pedal is pressed. Meter it before you tap it.
Which years share wiring with the 2023 GMC Terrain?
2018, 2019, 2020, 2021, 2022. Fortin uses the same guide for these years.
Help build this page
Had the panels off on one of these? Show the next installer what you found.
No one has sent photos for the 2023 GMC Terrain yet, so yours could be the first. Every photo, wire color and tip we use goes on this page with your name on it, and it saves the next installer time under the dash.
1. Snap it
The plugs, tap points, fuse boxes and ground points. Phone photos are fine.
2. Send it
Tap "Add yours" at the top of this page. Your tip and your photos go in the same box.
3. See your name on it
We check every tip, then post it here "Compliments of" you, by name.
Compliments of
The installers who helped build this page.
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Founding contributor spot: openThe first installer to confirm a wire or send photos for the 2023 GMC Terrain gets their name here, and it stays here.
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Every tip we use gets a creditThe wire you checked is marked "Checked on a vehicle, compliments of" you.
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