Which wires give constant, ignition and ground on a 2021 Toyota Sienna?
On a 2021 Toyota Sienna, take constant power from the Red wire at the OBD-II port, pin 16, ignition from the White wire at the junction block white 25-pin plug, left of the driver side ECU, and ground to the White/Black wire at the body ECU black 30-pin plug, driver side. 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:OBD port and ECUSystem voltage:12VIgnition type:Push-button
Where do I get constant, ignition and ground on a 2021 Toyota Sienna?
The 2021 and newer Sienna is hybrid only. Constant is at the OBD-II port, ignition at the driver side ECU area.
Option 1 Constant and ground
OBD port and ECU
Under the dash, driver side.
Constant
Red
OBD-II port, pin 1612V battery feed. Fortin prints Red for 2021 and Black for 2022.
Ground
White/Black
Body ECU black 30-pin plug, driver sideGround.
CAN is on the black 30-pin ECU plug too.
Option 2 Ignition
Junction block and ECU
Left of the driver side ECU.
Ignition
White
Junction block white 25-pin plug, left of the driver side ECUIgnition 1.
Ignition 2
Black
Body ECU white 23-pin plug, driver sideIgnition 2.
Starter is Purple on the black 54-pin ECU plug. Never tap it.
From Fortin's install guide for the 2021 to 2025 Sienna (guide 101551).
Where are the turn signal, reverse and light wires on a 2021 Toyota Sienna 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 2021 to 2025 Sienna (guide 101551).
Where are the brake, door, speed and CAN wires on a 2021 Toyota Sienna for advanced 360 multicam and video telematics installs?
Circuit
Wire color
Location and what it does
LiftgateNegative -Not yet checked
Red
Body ECU white 27-pin plug, driver sideTrunk / liftgate input.
HornNegative -Not yet checked
Green
Black 14-pin plug at the steering column switchHorn switch input.
CAN dataDataNot yet checked
Light Green (high)
White (low)
Body ECU black 30-pin plug, driver sideNever 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.
Vehicle speedNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Source: Fortin's install guide for the 2021 to 2025 Sienna (guide 101551). Turn, headlight, reverse, dome, brake and speed wires were not found.
Where are the fuse boxes and ground points on a 2021 Toyota Sienna?
Steering columnIgnition or column plugPower on 2013 to 2020 vans.
Driver sideBody ECU and junction blockPower on 2021 and newer.
Ground pointsBare body metalNever the battery negative post.
Locations from Fortin's install guides.
Where is the OBD-II port on a 2021 Toyota Sienna?
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 2021 Toyota Sienna?
This page2021Toyota Sienna.
Nearby years2018, 2019, 2020, 2022, 2023, 2024Power colors stay the same 2013 to 2020. 2021 and newer is a new hybrid van.
CheckKey or buttonPick the box on this page that matches how the van starts.
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This page covers the 2021 Toyota Sienna minivan.
The wire colors come from Fortin's install guides, read wire by wire. Our own team has not yet metered these on a 2021 Sienna.
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 2021 Toyota Sienna wiring
What wire is constant power on a 2021 Toyota Sienna?
Red at the OBD-II port, pin 16. 12V battery feed. Meter it before you tap it.
What wire is ignition on a 2021 Toyota Sienna?
White at the junction block white 25-pin plug, left of the driver side ECU. Ignition 1. Meter it before you tap it.
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 2021 Toyota Sienna 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 2021 Toyota Sienna 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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Your name, right on this page, for everyone who uses it to see. Add your tip and your photos in one box.
