Which wires give constant, ignition and ground on a 2012 Toyota Corolla?
On a 2012 Toyota Corolla, take constant power from the Blue or White wire at the white 8-pin ignition harness plug, steering column, pin 7, ignition from the Brown or Gray wire at the white 8-pin ignition harness plug, steering column, pin 6, 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 harness or OBD-II portSystem voltage:12VIgnition type:Key and push-button (this page)
Where do I get constant, ignition and ground on a 2012 Toyota Corolla?
Key start: one plug at the key cylinder. Push-button: constant at the OBD-II port, ignition from a fuse tap.
Option 1 Key start
Ignition harness plug
White 8-pin plug on the key cylinder.
Constant
Blue or White
White 8-pin ignition harness plug, steering column, pin 712V battery feed. Meter it: the color varies.
Ignition
Brown or Gray
White 8-pin ignition harness plug, steering column, pin 6Ignition 1. Hot with the key in run.
Ground
Body ground
Bare metal under the dashNo ground wire in the guide. Never the battery negative post.
Starter is Black on pin 8. Never tap it. Ignition 2 is Green or White on pin 4.
Option 2 Push-button
OBD-II port
Constant on pin 16.
Constant
Lt.Green or Green
OBD-II port, pin 1612V battery feed.
Ignition
Fuse tap
Interior fuse panelNo ignition wire in the push-button guide. Use a slot that is dead off and hot on.
Ground
Body ground
Bare metal under the dashNo ground wire in the guide. Never the battery negative post.
Never tap the start button wire.
Key start from Fortin's install guide for the 2010 to 2013 Corolla with a key (guide 92091). Push-button from Fortin's install guide for the 2009 to 2013 Corolla with push-button start (guide 91911).
Where are the turn signal, reverse and light wires on a 2012 Toyota Corolla 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
Brown (push-button, pin 18) or White or Brown (key)
White 20-pin light switch harnessNegative parking light. 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 2010 to 2013 Corolla with a key (guide 92091) and Fortin's install guide for the 2009 to 2013 Corolla with push-button start (guide 91911).
Where are the brake, door, speed and CAN wires on a 2012 Toyota Corolla for advanced 360 multicam and video telematics installs?
Circuit
Wire color
Location and what it does
CAN dataDataNot yet checked
Lt.Green (high)
White (low)
OBD-II port, pins 6 and 14Never cut or splice the CAN wires.
DoorsNegative -Not yet checked
Purple
Driver running board harnessDriver door, from the push-button guide. Ground when the door is open.
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 2010 to 2013 Corolla with a key (guide 92091) and Fortin's install guide for the 2009 to 2013 Corolla with push-button start (guide 91911). Wires marked Not found were not in the guides.
Where are the fuse boxes and ground points on a 2012 Toyota Corolla?
Driver dashOBD-II portPush-button constant and CAN.
Ground pointsBare body metalNever the battery negative post.
Locations from Fortin's install guides.
Where is the OBD-II port on a 2012 Toyota Corolla?
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 2012 Toyota Corolla?
This page2012Toyota Corolla.
Same wiring2010, 2011, 2013Fortin uses the same guides for these years.
Newer Corolla2014 and newerDifferent wiring. Check the page for your year.
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This page covers the 2012 Toyota Corolla sedan with a key start or push-button start.
The wire colors come from Fortin's install guides, read wire by wire. Our own team has not yet metered these on a 2012 Corolla.
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 2012 Toyota Corolla wiring
What wire is constant power on a 2012 Toyota Corolla?
Blue or White at the white 8-pin ignition harness plug, steering column, pin 7. 12V battery feed. Meter it before you tap it.
What wire is ignition on a 2012 Toyota Corolla?
Brown or Gray at the white 8-pin ignition harness plug, steering column, pin 6. Ignition 1. Meter it before you tap it.
Which years share wiring with the 2012 Toyota Corolla?
2010, 2011, 2013. 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 2012 Toyota Corolla 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 2012 Toyota Corolla 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.
Want to be famous?
Your name, right on this page, for everyone who uses it to see. Add your tip and your photos in one box.
