Which wires give constant, ignition and ground on a 2019 Mazda CX-9?
On a 2019 Mazda CX-9, take constant power from the Green wire at the white 24-pin plug on the start-stop unit, under the steering column, pin 12, ignition from the Light Blue wire at the white 24-pin plug on the start-stop unit, under the steering column, pin 10, and ground to the Pin 13 wire at the white 24-pin plug on the start-stop unit, under the steering column, pin 13. 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:Start-stop unit plugSystem voltage:12VIgnition type:Push-button (this page)
Where do I get constant, ignition and ground on a 2019 Mazda CX-9?
Constant, ignition, accessory and ground are on one plug at the start-stop unit.
Option 1 All the power
Start-stop unit plug
White 24-pin plug under the steering column.
Constant
Green
White 24-pin plug on the start-stop unit, under the steering column, pin 1212V battery feed.
Ignition
Light Blue
White 24-pin plug on the start-stop unit, under the steering column, pin 10Hot with the button on.
Accessory
Gray
White 24-pin plug on the start-stop unit, under the steering columnAccessory. The start button wire on this plug is also Gray, so meter it.
Ground
Pin 13
White 24-pin plug on the start-stop unit, under the steering column, pin 13Ground pin on the same plug. Or use bare body metal.
Starter is Yellow/Black. Never tap it.
Option 2 Backup
Fuse tap
If you would rather not open the column.
Ignition
Fuse tap
Interior fuse panelBackup: a slot that is dead off and hot on.
Use an add-a-fuse.
From Fortin's install guide for the 2016 to 2020 CX-9 with push-button start (guide 65551).
Where are the turn signal, reverse and light wires on a 2019 Mazda CX-9 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
Blue
Black
White 8-pin plug inside the parking light switch, pins 1 and 2Fortin marks this optional. Meter it first.
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 2016 to 2020 CX-9 with push-button start (guide 65551).
Where are the brake, door, speed and CAN wires on a 2019 Mazda CX-9 for advanced 360 multicam and video telematics installs?
Circuit
Wire color
Location and what it does
CAN dataDataNot yet checked
Pink (high)
Green/Red (low)
White 24-pin plug on the start-stop unit, under the steering column, pins 7 and 8Never 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 install guide for the 2016 to 2020 CX-9 with push-button start (guide 65551). Wires marked Not found were not in the guide.
Where are the fuse boxes and ground points on a 2019 Mazda CX-9?
Steering columnStart-stop unit plugPower and CAN.
DashParking light switchParking light wires.
Ground pointsPin 13 or body metalNever the battery negative post.
Locations from Fortin's install guide.
Where is the OBD-II port on a 2019 Mazda CX-9?
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 2019 Mazda CX-9?
This page2019Mazda CX-9.
Same wiring2016, 2017, 2018, 2020Fortin uses the same guide for these years.
Not covered2015 and older, 2021 and newerNot on this page.
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This page covers the 2019 Mazda CX-9 midsize 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 2019 CX-9.
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 2019 Mazda CX-9 wiring
What wire is constant power on a 2019 Mazda CX-9?
Green at the white 24-pin plug on the start-stop unit, under the steering column, pin 12. 12V battery feed. Meter it before you tap it.
What wire is ignition on a 2019 Mazda CX-9?
Light Blue at the white 24-pin plug on the start-stop unit, under the steering column, pin 10. Hot with the button on. Meter it before you tap it.
Which years share wiring with the 2019 Mazda CX-9?
2016, 2017, 2018, 2020. 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 2019 Mazda CX-9 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 2019 Mazda CX-9 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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