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Which wires give constant, ignition and ground on a 2020 Chevrolet Traverse?
On a 2020 Chevrolet Traverse, take constant power from the Red/Green or Red/Blue wire at the blunt-cut brake controller wires inside the driver side of the dash, below the headlamp switch (if equipped, and dead until it is connected at the underhood fuse block), ignition from the Purple/Black wire at the BCM plug X3, green 25-pin, pin 6, and ground to the Black wire at the same bundle of four wires. Meter every wire first.
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 truck in front of you.
This page covers the 2020 Chevrolet Traverse.
Every Traverse of this body has push-button start, so there is no key switch to tap. Ignition, brake and CAN wires are at the BCM beside the center console, from one maker guide. Constant, ground and the lamp wires come from the brake controller and trailer wiring in the GM owner manual, which not every vehicle has. Our own team has not yet metered these on a 2020 vehicle.
OBD-II portUnder the dash, left of the steering wheel
Best power spotBCM at the center console
System voltage12V
Ignition typePush-button
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Where do I get constant, ignition and ground on a 2020 Chevrolet Traverse?
Take constant, ignition and ground from the same area where you can.
Option 1 Ignition
BCM at the center console
Right side of the center console, behind the front floor console side panel.
Constant
Not found
Not foundNo constant wire was found at the BCM. Use option 2 or a fuse tap.
Ignition
Purple/Black
BCM plug X3, green 25-pin, pin 6Hot in run.
Ground
Body ground
Body metal under the dashClean, bare metal only. Never the battery negative post.
GM says a leaking A/C drain hose can wet the BCM plugs on these years, and that static can damage the BCM. Touch bare metal before you unplug anything. GM bulletin 19-NA-271 also takes an ignition feed from a Violet/Black wire at pin 1 of plug M73B under the passenger seat, on vehicles with ventilated seats only.
Option 2 Constant and ground
Brake controller wires
If equipped. Four capped wires taped to the harness under the driver side of the dash.
Constant
Red/Green or Red/Blue
Blunt-cut brake controller wires inside the driver side of the dash, below the headlamp switch (if equipped, and dead until it is connected at the underhood fuse block)Battery feed. The manual gives two possible colors. Meter it first: GM leaves this wire unconnected at the fuse block.
Ground
Black
Same bundle of four wiresGround wire for a brake controller.
From the GM owner manual. Not every Traverse has these wires. The other two are Blue (to the trailer brakes) and White/Blue (brake signal).
Ignition wire from the iDatalink install guide for 2018 to 2021. Brake controller wires from the GM owner manual.
What are the turn signal, reverse and light wires on a 2020 Chevrolet Traverse?
Circuit
Wire color
Location and what it does
Left turnPositive +Not yet checked
Yellow/Blue
7-pin trailer harness at the rear, tied to the frame (if equipped), circuit 1Combined left stop and turn output for a trailer, from the GM owner manual. No turn signal wire inside the vehicle was found.
Right turnPositive +Not yet checked
Green/Brown
7-pin trailer harness at the rear, tied to the frame (if equipped), circuit 5Combined right stop and turn output for a trailer, from the GM owner manual. No turn signal wire inside the vehicle was found.
Park lightPositive +Not yet checked
Gray/Brown
7-pin trailer harness at the rear, tied to the frame (if equipped), circuit 2Tail and parking lamp output for a trailer. At the BCM the park light trigger is Green/Gray, negative, on plug X1 (white 26-pin), pin 22.
HeadlightNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
ReversePositive +Not yet checked
White/Green
7-pin trailer harness at the rear, tied to the frame (if equipped), circuit 3Reverse lamp output for a trailer. No reverse wire inside the vehicle was found.
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: the GM owner manual (trailer wiring). Park light trigger from the iDatalink install guide for 2018 to 2021.
Where are the brake, door, speed and CAN wires on a 2020 Chevrolet Traverse?
Circuit
Wire color
Location and what it does
BrakePositive +Not yet checked
Blue/Yellow (BCM)
White/Blue (brake controller wire)
BCM plug X2, blue 27-pin, pin 7. Or the blunt-cut brake controller wires under the driver side of the dash, if equippedHot with the pedal pressed. BCM wire from iDatalink, brake controller wire from the GM owner manual.
DoorsNot foundNot yet checked
Not found
Not foundNo door wire was found. Remote start modules read door status as data through the BCM.
Parking brakeNot foundNot yet checked
Not found
Not foundThe parking brake is electric. No wire was found.
HazardNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Trailer brake outputPositive +Not yet checked
Blue
Brake controller wires under the driver side of the dash, and circuit 6 of the 7-pin trailer harnessFeeds the trailer brakes from a brake controller. Not a vehicle signal.
SeatbeltNot 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.
TachNot foundNot yet checked
Not found
Not foundNo tach wire was found. Remote start modules read engine speed as data.
CAN busDataNot yet checked
Blue (high)
White (low)
BCM plug X1, white 26-pin, pins 25 and 24From one maker guide. The 2018 Traverse has these wires on plug X2 instead, so go by plug and pin. Never cut or splice them. GM warns that a tracker left on the OBD port can keep the data bus awake and drain the battery.
Sources: the iDatalink install guide for 2018 to 2021 (BCM wires) and the GM owner manuals for 2018 to 2023 (trailer and brake controller wires). Doors, parking brake, hazard, seatbelt, speed and tach were not found. No source gave CAN wires at the OBD port.
Which years share wiring with the 2020 Chevrolet Traverse?
This page2020Covered by the maker guide for 2019 to 2021.
Same wiring2019 and 2021iDatalink lists 2019 to 2021 as one install. The GM owner manuals print the same trailer and brake controller colors for each of these years.
Not this page2018 or 2022 and newer2018 has the CAN wires on a different plug. No BCM source was found for 2022 and 2023.
Where are the fuse boxes and ground points on a 2020 Chevrolet Traverse?
InteriorInside the center console, passenger sideOpen the access door with a coin. Fuse names include F37 (power outlet, wireless charger, accessory) and F2 (diagnostic link).
Under the hood and rearDriver side of the engine bayA third fuse block sits behind a trim panel on the driver side of the rear cargo area. GM says the rear cargo power outlet is always powered.
Ground pointsClean body metalNo named ground point was found. Never use the battery negative post.
Fuse box locations from the 2018 and 2019 GM owner manuals. No fuse amp ratings were found, so read the lid label before you use a slot.
Where is the OBD-II port on a 2020 Chevrolet Traverse?
OBD II
Diagnostic portOBD-II port: under the dash, left of the steering wheelPlug-in GPS trackers and OBD harnesses connect here. Check the port before you plan the install.
Common questions about 2020 Chevrolet Traverse wiring
What wire is constant power on a 2020 Chevrolet Traverse?
Red/Green or Red/Blue at the blunt-cut brake controller wires inside the driver side of the dash, below the headlamp switch (if equipped, and dead until it is connected at the underhood fuse block). Battery feed. Meter it before you tap it.
What wire is ignition on a 2020 Chevrolet Traverse?
Purple/Black at the BCM plug X3, green 25-pin, pin 6. Hot in run. Meter it before you tap it.
Where is the reverse wire on a 2020 Chevrolet Traverse?
White/Green (positive +) at the 7-pin trailer harness at the rear, tied to the frame (if equipped), circuit 3. Reverse lamp output for a trailer. Meter it before you tap it.
Where is the brake wire on a 2020 Chevrolet Traverse?
Blue/Yellow (BCM) and White/Blue (brake controller wire) (positive +) at the BCM plug X2, blue 27-pin, pin 7. Or the blunt-cut brake controller wires under the driver side of the dash, if equipped. Hot with the pedal pressed. Meter it before you tap it.
Where is the CAN bus on a 2020 Chevrolet Traverse?
Blue (high) and White (low) at the BCM plug X1, white 26-pin, pins 25 and 24. From one maker guide.
Which years share wiring with the 2020 Chevrolet Traverse?
2019 and 2021. iDatalink lists 2019 to 2021 as one install.
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