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Which wires give constant, ignition and ground on a 2012 Toyota Tundra?
On a 2012 Toyota Tundra, take constant power from the Black wire at the dash fuse box, white 1-pin plug, pin 1, ignition from the Black wire at the ignition switch, white 8-pin plug, pin 6, 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 2012 Toyota Tundra.
This truck has a G-key. The wire list comes from the 2010 and 2014 sheets, carried to 2012. No Toyota wiring diagram was available to us, so every color here is installer-reported. Our own team has not yet metered these on a 2012 truck.
OBD-II portUnder the driver dash, white plug above the brake pedal
Best power spotDash fuse box and ignition switch
System voltage12V
Ignition typeG-key
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Where do I get constant, ignition and ground on a 2012 Toyota Tundra?
Take constant, ignition and ground from the same area.
Option 1 Easiest
Ignition switch and dash fuse box
Both under the driver side dash, close together.
Constant
Black
Dash fuse box, white 1-pin plug, pin 1Always hot, 140A or 150A. The thick Black wire. The plug is lettered (A) or (DA).
Ignition
Black
Ignition switch, white 8-pin plug, pin 6Hot in run. Light Green on pin 1 is the second ignition wire.
Ground
Body ground
Body metal under the dashClean, bare metal only. Never the battery negative post. No source named a factory ground bolt.
Accessory
Gray
Ignition switch, white 8-pin plug, pin 2Hot in accessory and run.
The starter is Green on pin 7. Never tap the starter. The switch wires are thin, so use the Black fuse box wire for anything that draws real current.
Option 2 Dash cam
Fuse tap
Add-a-fuse taps for a dash cam.
Accessory
Fuse tap
Dash fuse box, ACC 7.5A fuse (#25)Hot in accessory and run. Use an add-a-fuse tap for a dash cam.
Ground
Body ground
Body metal under the dashClean, bare metal only. Never the battery negative post. No source named a factory ground bolt.
Fuse numbers from a transcription of the 2007 to 2013 owner's manual. Check the lid label before you use a slot.
Colors from a 2010 Tundra wire sheet on the12volt (filed for 2007 to 2013) and a 2014 Tundra wire sheet on the12volt (Directed data) and a 2014 install post. The 2015 installers say it matches 2014. The ignition switch colors are the same on every sheet.
What are the turn signal, reverse and light wires on a 2012 Toyota Tundra?
Circuit
Wire color
Location and what it does
Left turnPositive +Not yet checked
Green (front)
Black (rear)
Flasher relay under the driver dash, left of the fuse box, white 18-pin plug, pins 10 and 2Flashes with the left signal. The 2010 sheet says the rear is Pink on the same pin.
Right turnPositive +Not yet checked
Beige (front)
Blue or Light Blue (rear)
Flasher relay, white 18-pin plug, pins 17 and 8Flashes with the right signal.
Park lightPositive +Not yet checked
Light Green
Dash fuse box, white 24-pin plug (B or DB), pin 8Park lamp output. Switch side is Beige (negative) at the Body ECU white 26-pin, pin 23.
HeadlightNegative -Not yet checked
White
Headlight switch or Body ECU, white 28-pin plug, pin 17Headlight switch output. Only the 2010 sheet lists it, so meter it.
ReversePositive +Not yet checked
Blue
Passenger kick, white 20-pin plug, pin 20Hot in reverse. Same wire on 2018 and 2021 sheets.
Dome lightNegative -Not yet checked
Blue
Interior light switch on the dash, black 12-pin plug, pin 11Dome light supervision.
Each chip shows the main insulation color with its stripe. Source: a 2010 Tundra wire sheet on the12volt (filed for 2007 to 2013) and a 2014 Tundra wire sheet on the12volt (Directed data) and a 2014 install post.
Where are the brake, door, speed and CAN wires on a 2012 Toyota Tundra?
Circuit
Wire color
Location and what it does
BrakePositive +Not yet checked
Beige
Brake switch, white 4-pin plug, pin 1Hot with the pedal pressed.
DoorsNegative -Not yet checked
Gray (driver)
Body ECU, white 26-pin plug, pin 24Grounds when the driver door is open. The 2014 sheets list only this door.
Parking brakeNegative -Not yet checked
Beige
Parking brake switch, or dash fuse box white 24-pin plug (B or DB), pin 11Grounds with the parking brake set.
HazardNegative -Not yet checked
Beige
Body ECU on the dash fuse box, white 16-pin plug, pin 4Hazard switch input.
Hood pinNegative -Not yet checked
Purple
Body ECU, white 26-pin plug, pin 16Grounds with the hood open.
SeatbeltNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Vehicle speedAC signalNot yet checked
White
Radio, white 20-pin plug, pin 3Speed signal from the 2010 sheet. Meter it on other years.
TachAC signalNot yet checked
Brown
OBD port, pin 9Engine speed signal. The pin is the same from 2008 to 2018; only the reported color changes.
CAN busDataNot yet checked
Purple (high)
White (low)
OBD port, pin 6 and pin 14From the 2010 sheet. Never cut or splice them.
Sources: a 2010 Tundra wire sheet on the12volt (filed for 2007 to 2013) and a 2014 Tundra wire sheet on the12volt (Directed data) and a 2014 install post (installer-reported). No Toyota wiring diagram was available. Park/neutral and seatbelt were not found.
Which years share wiring with the 2012 Toyota Tundra?
This page2012Carried from the 2010 and 2014 sheets.
Same wiring2010, 2011, 2013, 2014 and 2015The 2010 sheet and the 2014 sheets use the same layout, and 2015 installers say 2015 matches 2014. We found no wiring change at the 2014 refresh.
Where are the fuse boxes and ground points on a 2012 Toyota Tundra?
InteriorDriver side, under the dashACC 7.5A (#25), PWR OUTLET 15A (#5). The Body ECU is attached to this box.
Under the hoodEngine bay fuse boxIGN 10A, STOP 15A, TURN-HAZ 15A, DOME 7.5A.
Ground pointsClean body metalNo named ground point found. Use clean, bare body metal, never the battery negative post.
Fuse list from a transcription of Toyota's 2007 to 2013 owner's manual. Check the lid label before you use a slot.
Where is the OBD-II port on a 2012 Toyota Tundra?
OBD II
Diagnostic portOBD-II port: under the driver dash, white plug above the brake pedalPlug-in GPS trackers and OBD harnesses connect here. Check the port before you plan the install.
Common questions about 2012 Toyota Tundra wiring
What wire is constant power on a 2012 Toyota Tundra?
Black at the dash fuse box, white 1-pin plug, pin 1. Always hot, 140A or 150A. Meter it before you tap it.
What wire is ignition on a 2012 Toyota Tundra?
Black at the ignition switch, white 8-pin plug, pin 6. Hot in run. Meter it before you tap it.
Where is the reverse wire on a 2012 Toyota Tundra?
Blue (positive +) at the passenger kick, white 20-pin plug, pin 20. Hot in reverse. Meter it before you tap it.
Where is the brake wire on a 2012 Toyota Tundra?
Beige (positive +) at the brake switch, white 4-pin plug, pin 1. Hot with the pedal pressed. Meter it before you tap it.
Where is the parking brake wire on a 2012 Toyota Tundra?
Beige (negative -) at the parking brake switch, or dash fuse box white 24-pin plug (B or DB), pin 11. Grounds with the parking brake set. Meter it before you tap it.
Where is the vehicle speed signal on a 2012 Toyota Tundra?
White at the radio, white 20-pin plug, pin 3. Speed signal from the 2010 sheet. Meter it before you tap it.
Which years share wiring with the 2012 Toyota Tundra?
2010, 2011, 2013, 2014 and 2015. The 2010 sheet and the 2014 sheets use the same layout, and 2015 installers say 2015 matches 2014.
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