Ultimate TUNDRA Wiring Diagrams Collection

Glad we could help!

 

Hi,
Cross-posting here from 3rd gen section (as I just realized this sub exists and you guys are most likely much better trained at this than all the cool kids complaining about their 3rd gens).

Anyway,
Can you please go over my homework and perhaps steer me in the right/better direction?
I've added mirror puddle LED lights (just like my 2017 Platinum had) and want them to turn on when the truck is unlocked, go off when locked and be in sync with that switch.

I'm looking to find which exact wire(s) provides 12V+ to the white cargo light (built into the 3rd brake light assembly), or the light that is in the tailgate door handle assembly (so that I can tap into it for my puddle lights).
If we can find which wire, and possibly at either driver or passenger side footwell wiring loom(s) it would be awesome.

They are controlled by a switch inside, where you can pick OFF, DOORS, ON, so that the lights come on when a door is open, and when the truck is unlocked.

Pics for reference; these are the lights which I need 12V+ from:




I got a reply in that thread, and did some of my own investigating, but I wanted to ask you guys if this the right direction - or is there an easier and better source of this wire to tap, without taking 1/2 the truck apart.

Here's what we came up with (see pics below).
Am I right (or wrong) thinking along these lines:
"Am I correct thinking that I need to pick up the "pink" wire on SI1 connector at passenger A-pilar, to have a somewhat accessible tap...or am I reading this wrong?

That LA-SB wire at S12 changes to violet, then pink as S10 to SI1......is this what I'm looking for (somewhere accessible, without tearing down 1/2 the truck)?"
See below, and thanks again.




Or...I am better off (and easier too) picking up the WHITE wire at IN1 on the passenger side foot well connector?




Sorry for a long post, but does this all make sense, or should I be looking elsewhere and at other location/wire?
Thank you for any and all help.
-99

 

Solved.
Pin#2 (white wire) on IN1 connector at the passenger foot well is the wire I needed (this provides power for the tailgate courtesy light).

Mirror courtesy/puddle light install+wiring thread coming soon (in 3rd gen section).
Thanks.
-99

 

Nice.
Been fighting a at work this week and haven’t had time to sit and digest your request, so glad that you figured it out!

 

Hi Casey, Thank you very much for posting these schematics. I just acquired a 2001 Tundra. The wire harness has been chewed by rats on the driver side inner fender well under the vacum/evap device up to the firewall. I am having pretty good luck putting it back together, but there are a couple of wires that do not make sense to me. They are identical color codes coming from the same direction. essentially two identical wires both headed to the firewall. ON the schematics i see the color code labeling, but mine also has dots on many wires...they have a main color, different stripe, and many have dots every inch....either 1 dot or 2 dots close to one another. The vacumn container is missing its two pressure sensor plugs and i believe there is a optional blank plug that is missing the connector there. Any advice you might have to offer or insight i would trully appreciate. I am soldering and heat shrinking my splices. The wires that dont have a mate passing through to the other end of the chewed area is giving me problems though.

 

Unfortunately, the only thing to do would be to hunt down any wires that match the color that would be in that vicinity (by using the schematics and the wiring connector locations) and then finding the other end and testing for continuity using a multimeter back from the bare wire to any of the points that might match.

As for the "dots" - I'm not sure I know what you're talking about. It's not uncommon for wires to have markings on them for things like length off the reel or other markings so that might be it.

 

Currently I am trying to figure out the color of the wires that would be expected to plug into V5 (vsv). I have a rudimentary grasp of schematics, but get lost moving between so many pages.

 

Hi, need help with hard wire a light bar on 2023 tundra Platinum HV. Need help with wire color to tap in for light bar. Thanks

 

Rule #1 - never go by wire color. Only go by connector and terminal (pin) number. There are rolling color changes and even colors incorrectly identified in these EWDs but the pin-outs remain much more consistent.
Rule#2 - these EWDs are here for you to download and search and learn how to use in planning or troubleshooting your own installations.

Not knowing anything about what your light bar is, what function you are trying to use it for, how you are wanting to wire it (auxiliary switch, switch controller of some kind, directly wired into other lights and what lights those might be), it's pretty close to impossible to give you an answer.

This thread is to provide some of the tools you need to find your answer once you know what it is you are actually trying to accomplish. I would recommend starting a new thread asking your specific questions and someone should be able to provide guidance directly associated with what you are trying to do.

 

I found the tail light connector for my project 3rd gen Tundra and I have 2 questions: 1)what's the purpose of the Lavender aluminum wire? It's a 12v wire but it says somewhere not to splice or get any signal from it.

2)what does WEL stands for on the picture?

 

Not much to go off of from the snip you posted, and I don't know the systems all that well in the Gen 3, but I'll take a stab and a few things.

1 - the snip you posted is from the "Interior Light" diagram, which includes the courtesy lights. My GUESS is that the tail-light assembly in the Gen 3 has some sort of courtesy light function and "WEL" would be "Welcome". spitballing here solely based on my experience with Toyota EWDs.

2 - not sure where you are finding that the wire is lavender aluminum. The "LA" is quite simply Toyota's abbreviation for "Lavender" because they use "L" for Blue (because "B" is Black). Again - I don't know the finite details on the Gen 3 to know IF or WHERE they may have used aluminum wire, but that's not what the "A" is in the wire color designation.

3 - Not sure where you found not to splice or get signal from a specific wire. I'm not aware of that data being in the EWDs.

4 - the purpose of the wire coming out of terminal 3 in connectors T4 and R2 (which may be White/Black or Lavender, depending on trim and features, and even has some discrepancies across a couple of the other diagrams) is GROUND. You can follow it in the wiring diagrams to main ground point "PC" that appears to be under the passenger side rear of the cab.

 

In the 2021 Tundra Introduction section,

Copper wires
B=Black W=White BR=Brown
L=Blue V=Violet SB=Sky Blue
R=Red G=Green LG=Light Green
P=Pink Y=Yellow GR=Gray O=Orange BE=Beige
DG=Dark Gray

Aluminum wires
LA=Lavender

NOTICE:
Do not splice into aluminum wires for power sources or signals.
Painted wiring

 

Awesome. Guess I should read the intro again

My bet on the note regarding splicing aluminum wires would be related to the fact aluminum wire doesn't have the same strength/integrity as copper wires. Processes and precautions for dealing with Al wire are much different than Cu. Why the hell they would use Al for any wire in these trucks is beyond me (other than minute weight savings and some cost savings I guess).

 

Wouldn’t WELL and WELR be wheel well Left and wheel well Right? (Not knowing where this schema snip is from. Are those the LED light assembly’s in the bed?

 

That snip is from the illumination diagram - those are the rear tail light assemblies being shown though

 

When multiple 'J' numbers are listed for connector such as on audio head unit (2015 Tundra specifically) there is a letter in parens such as J116(A), J133(C), J135(E), J136(F), J151(K), K1(M), K3(N), L1(Q). How is that deciphered? I can not find a key in the pdf.

 

That letter corresponds to the letter in the circle where the wire connects to the "block" in the diagrams. Also important is to review the (*) notations.




For example, in the screen shots above:
The pink "IG" (ignition) wire goes into the head unit on Terminal/Pin 1, Connector "E" for Vehicles denoted with *1 -> So the "*1" is for vehicles that have factory Navigation, and "E" is then referencing connector J135.
The same wire for NON-Navigation vehicles is Terminal 1 in Connector J139 (I).

Hope that helps!

 

Are you sure they’re aluminum conductors and not tinned copper?

I work in R&D in the wire and cable industry. I do A LOT of work with automotive wiring from many/most OEMs. In my 25 years experience I have NEVER seen an aluminum conductor in a cable manufactured for an automotive application, nor have I even heard of anybody considering it.

 

From the EWD Introduction on the TIS website.

 

Interesting. I wonder what the application is.

I’m out of work right now with a back injury, but when I get back I’m going to have to do a little research.

 

So far I've only seen it pop up in the 2022+ trucks, and so far only in some of the wiring going to the tail-light assemblies. But I haven't spent very much time actually pouring over the 2022+ diagrams either.

 

Thank you! How did you know I was interested in the parking brake signal? lol

 

You just said you were looking at the radio for the 2015 and that's the first part of that diagram. But, given recent activity surrounding car audio head units, I am not surprised!

 

Getting a little off topic, but anybody here confirm if parking brake signal is simply switch closure to ground? I'm pretty sure it as there is only one conductor at the pedal. I'm installing an Alpine bundle and some functions want the parking brake to be on. I never use the brake and I would like to access those features sometimes while moving. So I'm thinking to add a switch to let me spoof the brake signal into the head unit. Anybody else try this yet?

 

It's simply a grounded signal but for the Alpine there's also a timing component to WHEN that ground is applied.

Pick up a PAC TR1 or similar device off ebay marketed for "Alpine Video Bypass Module" and wire it in. You can probably find the PAC TR1 at a local stereo shop even.
Pac TR1 Navigation or Video Bypass Universal Trigger Output Module 609098818452 | eBay

 

Thank. I know the Alpine I think wants to see brake go on-off-on
[edit] follow up in case anyone is interested. The recommended PAC-TR1 is wired up and solves my problem. Configuration is Alpine ILX-F509, with Alpine DVR-C320R dash cam. I can indeed get to settings and display dash cam video while moving with this setup. The rear dash cam camera can see the bed the way I have it pointed and still see horizon behind me. Perfect. Thanks for the help RainMan

 

This is a fantastic resource! Thanks for posting. I think I found what I need, but I'm a noob when it comes to understanding some of it. I was planning on tapping into the center stop light circuit to enable the 3rd brake light on my GFC topper. I'd heard tales of error messages and problems attempting to connect to the tail light or trailer lighting, so I figured this might be a safe bet. I found the circuit and am hoping for some help to make sure I don't eff it up. My plan is to locate connector N43 and tap the wire located at pin 20 and run that back to the topper wiring. I was planning on finding a suitable ground at the back of the truck and attaching it there instead of the co-located ground at the connector. From how it looks to me, I should be able to find N43 and the blue wire (pin 20-will still confirm pin) under the passenger side. Am I reading this right? If there is a better option, I would love to hear about that as well. I've searched around about what folks have done, but it is still unclear to me. Thanks in advance for any help! BTW, I'm driving a 2023 Hybrid Crew Max

Willy

 

wow. I think I am way off the mark. I can't identify the connector and the pinouts don't agree with what I expected. Any help would be appreciated!

willy

 

Sorry for the slow reply - been tied up all week.
From your first post, yes, it would appear that N43 is a junction connector located where you indicated (looks like in a cluster of other connectors - though it is not the normal "harness-to-harness" junction connector). I would probably opt for finding wire-wire connector NO3 (where the pink and yellow harnesses connect to each other) and grabbing pin 9 there (it looks like that connector is OUTSIDE the cab, or at least is a sealed connector). Of course, it's all the same circuit, so I'm not really sure what errors people are getting or why, but I'm also not seeing anything electrically that would indicate tapping the TBL instead of the tail light or trailer brake light wiring would be any different (except that you do not want to TAP any aluminum wires). But that is why I would make a "vampire" harness at one of the junction connectors like PR1 or PT1 so that I'm not actually tapping any wires and instead am pulling off with a break-out junction.

 

Thanks for the info! I'm going to reassess my plan and will probably try your approach either trying a tap or building a vampire. I appreciate your help!

willy