Which wires give constant, ignition and ground on a 2018 Nissan Altima?
On a 2018 Nissan Altima, take constant power from the White wire at the body control module behind the instrument cluster, white 15-pin plug, pin 5, ignition from the White wire at the body control module behind the instrument cluster, black 40-pin plug, 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
Where do I get constant, ignition and ground on a 2018 Nissan Altima?
Every power wire is at the body control module behind the instrument cluster. Two different wires are White, so go by the plug.
Option 1 Constant
White 15-pin plug
At the body control module.
Constant
White
Body control module behind the instrument cluster, white 15-pin plug, pin 512V battery feed.
Ground
Body ground
Bare metal under the dashNo ground color printed. Never the battery negative post.
Meter before you tap.
Option 2 Ignition
Black 40-pin and 24-pin plugs
Same module.
Ignition
White
Body control module behind the instrument cluster, black 40-pin plugIgnition 1. The 12V wire is also White, on the white 15-pin plug, so go by plug.
Ignition 2
Pink
Body control module behind the instrument cluster, black 24-pin plugIgnition 2.
Accessory
Red
Body control module behind the instrument cluster, black 40-pin plugAccessory.
Starter is Brown on the black 40-pin plug. Never tap it.
From Fortin's install guide for the 2013 to 2018 Altima with push-button start (guide 66421).
Where are the turn signal, reverse and light wires on a 2018 Nissan Altima 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 lightNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
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 2013 to 2018 Altima with push-button start (guide 66421).
Where are the brake, door, speed and CAN wires on a 2018 Nissan Altima for advanced 360 multicam and video telematics installs?
Circuit
Wire color
Location and what it does
Driver doorNegative -Not yet checked
Brown
Body control module behind the instrument cluster, gray 24-pin plugGround when the driver door is open.
Hazard switchNegative -Not yet checked
Yellow
Body control module behind the instrument cluster, green 40-pin plugHazard switch input, not a lamp output.
CAN dataDataNot yet checked
Blue (high)
Pink (low)
Body control module behind the instrument cluster, black 24-pin plugNever cut or splice the CAN wires.
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 2013 to 2018 Altima with push-button start (guide 66421). Turn, park, headlight, reverse, dome, brake and speed wires were not found.
Where are the fuse boxes and ground points on a 2018 Nissan Altima?
DashBody control moduleBehind the cluster (2013 to 2018) or left of the column (2019 and newer).
DiagnosticOBD-II portPower on 2019 and newer.
Ground pointsBare body metalNever the battery negative post.
Locations from Fortin's install guides.
Where is the OBD-II port on a 2018 Nissan Altima?
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 2018 Nissan Altima?
This page2018Nissan Altima, push-button.
Same wiring2013, 2014, 2015, 2016, 2017Fortin uses the same guide for these years.
Not this page2019 to 2025Different generation, different plugs.
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This page covers the 2018 Nissan Altima sedan 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 2018 Altima.
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 2018 Nissan Altima wiring
What wire is constant power on a 2018 Nissan Altima?
White at the body control module behind the instrument cluster, white 15-pin plug, pin 5. 12V battery feed. Meter it before you tap it.
What wire is ignition on a 2018 Nissan Altima?
White at the body control module behind the instrument cluster, black 40-pin plug. Ignition 1. Meter it before you tap it.
Which years share wiring with the 2018 Nissan Altima?
2013, 2014, 2015, 2016, 2017. 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 2018 Nissan Altima 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 2018 Nissan Altima 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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