How to Use Factory AUX Harness in 2024 Tacoma SR5 4x4 (No Pigtails or AUX Buttons, No Firewall Wiring Needed)?

[patriotgiants]

Hey everyone,

I have a 2024 Tacoma SR5 4x4 that came with the factory auxiliary harness (Locations A & B), but it did not include pigtails or factory-installed AUX buttons. Since the harness is already installed, I want to figure out how to use it without running additional wiring through the firewall.


What I Know So Far:

Location A (Engine Bay) has power and is designed for connecting accessories.

Location B (Cabin - Behind Trim Panel) is also powered, capped from the factory, and can be used for switches.

I do not have factory AUX buttons, so I need to figure out how to control these circuits using the existing harness.


What I Need Help With:


1. How do I properly connect accessories (like ditch lights) using only the existing harness?


2. How do I control the circuits without factory AUX buttons?


3. For anyone with the factory AUX buttons installed:

Can you share a picture of your switch panel so I can see what it looks like? does it directly connect to Location B, or is there another module in between?

Goal:

I want to use the factory harness as Toyota intended, without running new wires through the firewall. Any help, wiring diagrams, or photos would be greatly appreciated!


Thanks in advance!

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[patriotgiants]

This is what the back of the panel looks like for me. Any chance you see the wiring needed from the picture?

 

[varography]

Hey everyone,

I have a 2024 Tacoma SR5 4x4 that came with the factory auxiliary harness (Locations A & B), but it did not include pigtails or factory-installed AUX buttons. Since the harness is already installed, I want to figure out how to use it without running additional wiring through the firewall.


What I Know So Far:

Location A (Engine Bay) has power and is designed for connecting accessories.

Location B (Cabin - Behind Trim Panel) is also powered, capped from the factory, and can be used for switches.

I do not have factory AUX buttons, so I need to figure out how to control these circuits using the existing harness.


What I Need Help With:


1. How do I properly connect accessories (like ditch lights) using only the existing harness?


2. How do I control the circuits without factory AUX buttons?


3. For anyone with the factory AUX buttons installed:

Can you share a picture of your switch panel so I can see what it looks like? does it directly connect to Location B, or is there another module in between?

Goal:

I want to use the factory harness as Toyota intended, without running new wires through the firewall. Any help, wiring diagrams, or photos would be greatly appreciated!


Thanks in advance!

YESSS I WAS JUST COMING TO THIS CONCLUSION AS WELL!!!

 

[patriotgiants]

My fuse box has spots for the AUX, but the fuses are not there. On the trims that are not a 4 x 4, that harness is not there and they don’t have the spots in the fuse box for it.

So Toyota must have made it possible for us to be able to utilize that somehow.

 

[Delta1Seven]

My fuse box has spots for the AUX, but the fuses are not there. On the trims that are not a 4 x 4, that harness is not there and they don’t have the spots in the fuse box for it.

So Toyota must have made it possible for us to be able to utilize that somehow.

Curious if you solved this.

 

[patriotgiants]

no I have not haha. It’s still a mystery to me why would they include the harness but not a way to add aux switches.

 

[daytonaviolet]

This is thread is related

https://www.tacoma4g.com/forum/threads/factory-do-it-yourself-aux-switchs.21304/

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