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Which wires give constant, ignition and ground on a 2016 Toyota Corolla?
On a 2016 Toyota Corolla, take constant power from the Blue wire at the ignition switch (key cars), white 8-pin plug, pin 4, ignition from the Gray wire at the ignition switch, white 8-pin plug, pin 3, and ground to clean, bare body metal. Meter every wire first.
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 truck in front of you.
This page covers the 2016 Toyota Corolla sedan.
The Corolla came with a key or push-button start. Key cars take power at the ignition switch plug; push-button cars at the steering lock plug. Body wires come from a 2014 installer list, carried to 2016. Our own team has not yet metered these on a 2016 car.
OBD-II portLocation not confirmed
Best power spotIgnition switch plug or steering lock plug
System voltage12V
Ignition typeKey or push-button
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Where do I get constant, ignition and ground on a 2016 Toyota Corolla?
Take constant, ignition and ground from the same area.
Option 1 Key cars
Ignition switch plug
Key cars. Steering column, white 8-pin plug.
Constant
Blue
Ignition switch (key cars), white 8-pin plug, pin 4Always hot.
Ignition
Gray
Ignition switch, white 8-pin plug, pin 3Hot in run. A second ignition wire, Green, is on pin 8.
Ground
Body ground
Body metal under the dashClean, bare metal only. Never the battery negative post.
Accessory
Black
Ignition switch, white 8-pin plug, pin 7Hot in accessory and run.
The starter is White on pin 2. Never tap the starter. The main battery feed is a White 120A wire on the dash fuse box white 1-pin plug; do not tap it for a small device.
Option 2 Push-button
Steering lock plug
Push-button cars. Under the steering column, black 7-pin plug.
Constant
Blue
Steering lock plug, black 7-pin, pin 7Always hot.
Ignition
Gray
Steering lock plug, black 7-pin, pin 6Hot in run.
Ground
Body ground
Body metal under the dashClean, bare metal only. Never the battery negative post.
From the iDatalink guide for push-button cars. The steering lock is under the steering column.
Key-car colors from the iDatalink install guides for 2014 to 2016, Directed and a 2014 installer list, which agree. Push-button colors from iDatalink.
What are the turn signal, reverse and light wires on a 2016 Toyota Corolla?
Circuit
Wire color
Location and what it does
Left turnPositive +Not yet checked
Yellow
Dash fuse box, white 40-pin plug (3E), pin 26Hot when the left signal flashes. From a 2014 list; the12volt files it under 2014 to 2016.
Right turnPositive +Not yet checked
Light Blue
Dash fuse box, white 40-pin plug (3E), pin 27Hot when the right signal flashes. From a 2014 list; the12volt files it under 2014 to 2016.
Park lightPositive +Not yet checked
Green
Dash fuse box, white 40-pin plug (3E), pin 29Hot with the park lights on. A negative trigger, White, is at the headlight switch, black 20-pin plug, pin 18. From a 2014 list; the12volt files it under 2014 to 2016.
HeadlightNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
ReversePositive +Not yet checked
Red
Dash fuse box, white 40-pin plug (3E), pin 4Hot in reverse. From a 2014 list; the12volt files it under 2014 to 2016.
Dome lightNegative -Not yet checked
Blue
Dash fuse box, white 56-pin plug (3C), pin 54Dome light supervision. From a 2014 list; the12volt files it under 2014 to 2016.
Each chip shows the main insulation color with its stripe. Source: a 2014 Corolla wire list on the12volt.
Where are the brake, door, speed and CAN wires on a 2016 Toyota Corolla?
Circuit
Wire color
Location and what it does
BrakePositive +Not yet checked
Blue
Dash fuse box, white 40-pin plug (3E), pin 11Hot with the pedal pressed. From a 2014 list; the12volt files it under 2014 to 2016.
DoorsNegative -Not yet checked
White
Dash fuse box, white 40-pin plug (3E), pin 34One door trigger wire is listed, not one per door. Meter it with each door. From a 2014 list; the12volt files it under 2014 to 2016.
TrunkNegative -Not yet checked
Light Green
Dash fuse box, white 40-pin plug (3E), pin 38Grounds with the trunk open. From a 2014 list; the12volt files it under 2014 to 2016.
Parking brakeNegative -Not yet checked
Black
Dash fuse box, white 40-pin plug (3E), pin 30Grounds with the parking brake set. From a 2014 list; the12volt files it under 2014 to 2016.
HazardNegative -Not yet checked
Gray
Hazard switch, gray 4-pin plug, pin 4Hazard switch input. From a 2014 list; the12volt files it under 2014 to 2016.
SeatbeltNot 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.
TachAC signalNot yet checked
Gray
OBD port, white 16-pin plug, pin 9Engine speed signal. From a 2014 list; the12volt files it under 2014 to 2016.
CAN busDataNot yet checked
Red (high)
White (low)
OBD port, pin 6 and pin 14iDatalink and Directed agree for 2014 to 2016, key and push-button. Never cut or splice them.
Sources: a 2014 Corolla wire list on the12volt and the iDatalink and Directed install guides for 2014 to 2016. Headlight, seatbelt and speed were not found. Only one door wire is listed.
Which years share wiring with the 2016 Toyota Corolla?
This page2016Maker guides cover this year; body wires carried from 2014.
Same wiring2014 and 2015iDatalink and Directed each list 2014 to 2016 as one install. The body wires come from a 2014 list that the12volt files under 2014 to 2016.
Not this page2017 and newerFacelift. The CAN tap moved to the body ECU plug and no body wire list was found.
Where are the fuse boxes and ground points on a 2016 Toyota Corolla?
InteriorUnder the dash, left side, under a lidGo by the fuse name on the lid: P/OUTLET (15A), ACC (7.5A), OBD (7.5A). Two fuse guides number these slots differently.
Under the hoodLeft side of the engine bayRADIO (20A) and DOME are here.
Ground pointsClean body metalNo named ground point was found. Never use the battery negative post.
Fuse names from fuse guides for 2014 to 2018 cars. They disagree on slot numbers and on some amp ratings, so read the lid label and meter the slot.
Where is the OBD-II port on a 2016 Toyota Corolla?
OBD II
Diagnostic portOBD-II port: location not confirmedLook under the driver side dash first, and send us a photo if you find it.
Common questions about 2016 Toyota Corolla wiring
What wire is constant power on a 2016 Toyota Corolla?
Blue at the ignition switch (key cars), white 8-pin plug, pin 4. Always hot. Meter it before you tap it.
What wire is ignition on a 2016 Toyota Corolla?
Gray at the ignition switch, white 8-pin plug, pin 3. Hot in run. Meter it before you tap it.
Where is the reverse wire on a 2016 Toyota Corolla?
Red (positive +) at the dash fuse box, white 40-pin plug (3E), pin 4. Hot in reverse. Meter it before you tap it.
Where is the brake wire on a 2016 Toyota Corolla?
Blue (positive +) at the dash fuse box, white 40-pin plug (3E), pin 11. Hot with the pedal pressed. Meter it before you tap it.
Where is the parking brake wire on a 2016 Toyota Corolla?
Black (negative -) at the dash fuse box, white 40-pin plug (3E), pin 30. Grounds with the parking brake set. Meter it before you tap it.
Where is the CAN bus on a 2016 Toyota Corolla?
Red (high) and White (low) at the OBD port, pin 6 and pin 14. iDatalink and Directed agree for 2014 to 2016, key and push-button.
Which years share wiring with the 2016 Toyota Corolla?
2014 and 2015. iDatalink and Directed each list 2014 to 2016 as one install.
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