Which wires give constant, ignition and ground on a 2021 Hyundai Sonata?
On a 2021 Hyundai Sonata, take constant power from the Red wire at the black 4-pin plug at the front of the dash fuse box, pin 4, ignition from the Red wire at the white 58-pin plug at the front of the fuse box, 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:Dash fuse box plugsSystem voltage:12VIgnition type:Push-button
Where do I get constant, ignition and ground on a 2021 Hyundai Sonata?
Power is at the dash fuse box plugs on this push-button Sonata.
Option 1 Push-button
Dash fuse box
Plugs on the front of the fuse box.
Constant
Red
Black 4-pin plug at the front of the dash fuse box, pin 412V battery feed.
Ignition
Red
White 58-pin plug at the front of the fuse boxIgnition. Meter it: it shares the Red color with the constant on the other plug.
Accessory
White
White 58-pin plug at the front of the fuse boxAccessory.
Ground
Body ground
Bare metal under the dashNo ground color printed.
The starter wire is Yellow (2016-2019) or Yellow/Black (2020 and newer). Never tap it.
Option 2 Backup
Fuse tap
For switched power.
Ignition
Fuse tap
Interior fuse panelBackup: a slot that is dead off and hot on.
Use an add-a-fuse.
From Fortin's Sonata install guides (guide 102031).
Where are the turn signal, reverse and light wires on a 2021 Hyundai Sonata 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 lightDataNot yet checked
Pink
White 16-pin plug at the steering column, pin 10Data (MUX) wire, not plain 12V. Never use it as a 12V sense.
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 Sonata install guides (guide 102031).
Where are the brake, door, speed and CAN wires on a 2021 Hyundai Sonata for advanced 360 multicam and video telematics installs?
Circuit
Wire color
Location and what it does
CAN dataDataNot yet checked
Orange (high)
Blue (low)
White 16-pin plug at the back of the fuse boxNever 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 Sonata install guides (guide 102031). Turn, headlight, reverse, dome, door, brake and speed wires were not found.
Where are the fuse boxes and ground points on a 2021 Hyundai Sonata?
Ground pointsBare body metalNever the battery negative post.
Locations from Fortin's install guides.
Where is the OBD-II port on a 2021 Hyundai Sonata?
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 2021 Hyundai Sonata?
This page2021Hyundai Sonata, gas.
Nearby years2018, 2019, 2020, 2022, 2023Plugs change in 2018 (key) and 2020 (push-button). Check the page for your year.
Not this pageSonata HybridHybrids use different Fortin guides.
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This page covers the 2021 Hyundai Sonata sedan (gas).
The wire colors come from Fortin's install guides, read wire by wire. Our own team has not yet metered these on a 2021 Sonata.
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 2021 Hyundai Sonata wiring
What wire is constant power on a 2021 Hyundai Sonata?
Red at the black 4-pin plug at the front of the dash fuse box, pin 4. 12V battery feed. Meter it before you tap it.
What wire is ignition on a 2021 Hyundai Sonata?
Red at the white 58-pin plug at the front of the fuse box. Ignition. Meter it before you tap it.
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 2021 Hyundai Sonata 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 2021 Hyundai Sonata 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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