Which wires give constant, ignition and ground on a 2008 Toyota Avalon?
On a 2008 Toyota Avalon, take constant power from the Black wire at the white 8-pin plug on the ignition harness, pin 7, ignition from the Yellow wire at the white 8-pin plug on the ignition harness, 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 plugSystem voltage:12VIgnition type:Key start (this page)
Where do I get constant, ignition and ground on a 2008 Toyota Avalon?
Constant and ignition are on one plug at the ignition harness.
Option 1 Main option
Ignition harness plug
White 8-pin plug on the steering column.
Constant
Black
White 8-pin plug on the ignition harness, pin 712V battery feed.
Ignition
Yellow
White 8-pin plug on the ignition harness, pin 6Ignition 1, hot with the key in run. Ignition 2 is Green on pin 4.
Accessory
Fuse tap
Not in the guideNo accessory wire is listed. Use a fuse tap.
Ground
Body ground
Bare metal under the dashNo ground wire in the guide. Never the battery negative post.
Starter wires are Blue on pin 8 and Red on pin 1. Never tap them.
Option 2 Accessory
Fuse tap
For an accessory feed.
Accessory
Fuse tap
Interior fuse panelNo accessory wire in the guide. Find a slot hot in accessory and run.
Use an add-a-fuse.
From Fortin's install guide for the 2008 to 2009 Avalon with a key (guide 81141).
Where are the turn signal, reverse and light wires on a 2008 Toyota Avalon 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
Blue
White 20-pin parking 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 2008 to 2009 Avalon with a key (guide 81141).
Where are the brake, door, speed and CAN wires on a 2008 Toyota Avalon for advanced 360 multicam and video telematics installs?
Circuit
Wire color
Location and what it does
BrakePositive +Not yet checked
Blue/Black
White 25-pin plug at the junction blockPositive with the pedal down. Meter it first.
DoorsNegative -Not yet checked
Blue
Blue 20-pin plug at the driver kick panelDriver door pin. Meter it first.
CAN dataNot 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 2008 to 2009 Avalon with a key (guide 81141). Wires marked Not found were not in the guide.
Where are the fuse boxes and ground points on a 2008 Toyota Avalon?
Ground pointsBare body metalNever the battery negative post.
Locations from Fortin's install guides.
Where is the OBD-II port on a 2008 Toyota Avalon?
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 2008 Toyota Avalon?
This page2008Toyota Avalon.
Same power wires2005, 2006, 2007, 2009, 2010, 2011, 2012Fortin shows the same ignition plug for 2005 to 2012. The body wires change by year.
Help build this pageWant to be famous?Share a wire color, a photo or a tip for this vehicle, and your name goes on this page.
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This page covers the 2008 Toyota Avalon full-size sedan with a key start.
The wire colors come from Fortin's install guide, read wire by wire. Our own team has not yet metered these on a 2008 Avalon.
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 2008 Toyota Avalon wiring
What wire is constant power on a 2008 Toyota Avalon?
Black at the white 8-pin plug on the ignition harness, pin 7. 12V battery feed. Meter it before you tap it.
What wire is ignition on a 2008 Toyota Avalon?
Yellow at the white 8-pin plug on the ignition harness, pin 6. Ignition 1, hot with the key in run. Meter it before you tap it.
Where is the brake wire on a 2008 Toyota Avalon?
Blue/Black (positive +) at the white 25-pin plug at the junction block. Positive with the pedal down. 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 2008 Toyota Avalon 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.
★
Founding contributor spot: openThe first installer to confirm a wire or send photos for the 2008 Toyota Avalon gets their name here, and it stays here.
★
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.
