Which wires give constant, ignition and ground on a 2020 Honda Civic?
On a 2020 Honda Civic, take constant power from the Green wire at the brown 5-pin plug on the ignition switch harness, pin 1, ignition from the Blue wire at the brown 5-pin plug on the ignition switch harness, pin 2, 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:Ignition switch or body control moduleSystem voltage:12VIgnition type:Key or push-button
Where do I get constant, ignition and ground on a 2020 Honda Civic?
Key-start and push-button Civics use different plugs. Pick the box that matches the car.
Option 1 Key start
Ignition switch plug
Brown 5-pin plug on the key cylinder harness.
Constant
Green
Brown 5-pin plug on the ignition switch harness, pin 112V battery feed.
Ignition
Blue
Brown 5-pin plug on the ignition switch harness, pin 2Hot with the key in run.
Accessory
White
Brown 5-pin plug on the ignition switch harness, pin 4Accessory.
Starter is Yellow on pin 5. Never tap it.
Option 2 Push-button
Body control module
Upper left of the dash.
Constant
Red
Body control module, upper left of the dash, gray 28-pin plug12V battery feed.
Ignition
Pink
Body control module, upper left of the dash, gray 36-pin plugIgnition 1. Ignition 2 is Light Gray on the black 32-pin plug.
Starter is Yellow on the gray 36-pin plug. Never tap it.
From Fortin's Civic install guides for 2016 to 2021: 57761 (key start) and 70781 (push-button).
Where are the turn signal, reverse and light wires on a 2020 Honda Civic 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
Gray
White 12-pin plug at the parking light switch, pin 8 (key start). Push-button: gray 28-pin plug at the body control module.Ground 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 Civic install guides for 2016 to 2021: 57761 (key start) and 70781 (push-button).
Where are the brake, door, speed and CAN wires on a 2020 Honda Civic for advanced 360 multicam and video telematics installs?
Circuit
Wire color
Location and what it does
HornNegative -Not yet checked
Tan
White 20-pin plug at the steering column (key start)Horn switch input.
CAN dataDataNot yet checked
Pink (high)
Blue (low)
Immobilizer 7-pin plug (key start) or blue 36-pin body control module plug (push-button)Never cut or splice the CAN wires.
DoorsNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
BrakeNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
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 Civic install guides for 2016 to 2021: 57761 (key start) and 70781 (push-button). Turn, headlight, reverse, dome, door, brake and speed wires were not found.
Where are the fuse boxes and ground points on a 2020 Honda Civic?
Steering columnIgnition switch plugKey-start power, 2016 to 2021.
DashBody control modulePush-button power.
Ground pointsBare body metalNever the battery negative post.
Locations from Fortin's install guides.
Where is the OBD-II port on a 2020 Honda Civic?
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 2020 Honda Civic?
This page2020Honda Civic, gas.
Same wiring2016, 2017, 2018, 2019, 2021Fortin uses the same guides for these years.
Changes2022New generation with different plugs and colors.
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This page covers the 2020 Honda Civic (gas).
The wire colors come from Fortin's install guides, read wire by wire. Our own team has not yet metered these on a 2020 Civic.
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 2020 Honda Civic wiring
What wire is constant power on a 2020 Honda Civic?
Green at the brown 5-pin plug on the ignition switch harness, pin 1. 12V battery feed. Meter it before you tap it.
What wire is ignition on a 2020 Honda Civic?
Blue at the brown 5-pin plug on the ignition switch harness, pin 2. Hot with the key in run. Meter it before you tap it.
Which years share wiring with the 2020 Honda Civic?
2016, 2017, 2018, 2019, 2021. Fortin uses the same guides 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 2020 Honda Civic 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 2020 Honda Civic 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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Your name, right on this page, for everyone who uses it to see. Add your tip and your photos in one box.
