Electrical uses/limits for Aux Switches/Inverter

[TacoTime]

There is interesting info in the user manual for those interested in using Aux Switches and Inverter for camper outfitting or other uses.

Owners manual

Aux Switches: Page 488

• Aux only operates with ignition on and may turn off with low 12v battery voltage.
• Connections are plugs with waterproof caps that are removed to be used with a Toyota accessary wiring harness pigtail (assumed parts Dept.)
• Circuits: Diagram on page 489
  • AUX1 - 15amps
  • AUX2 - 10amps
  • AUX3 - 5amps
• Diagram shows that AUX1-3 have wired all three circuits stubbed to these locations.
  • Under hood driver side front.
  • Driver seat kick panel.
• There is also a 20amp wire run from under hood driver side front to the bed by the tailgate. This wire run looks like it can be plugged into the under hood driver side front to power. It also looks like if one wants to do a second battery under hood or other, they could use this wire run for that separate from AUX control. This wire run has a 20amp fuse under rear seat.

Inverter: Page 483

• There seems to be some operational discrepancies between YouTube videos on the 400W features and the manual. Someone will have to test once they have a truck. It is notable that if start/stop is engaged (assuming non-hybrid) then the power will cut if the engine stops. (Expected)

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[Nixamantacoma]

Thanks for sharing this. I was looking for this information a few days ago. The salesman at the dealership did not know the answer to the location of the aux wiring.

 

[StreeTaco]

FYI in case you missed it.

As stated in manual…

 

[Hannzie]

FYI in case you missed it. Makes me think the hybrid’s inverter may be the same way 600w/2400w

As stated in manual…

It remains 2400w while driving or parked for the hybrids. Chief engineer explains it. go to 10 minutes in on the video.

 

[M1KL83]

Any updates on these pre-wired aux switches? Following to see how creative minds put these to good use.
I was nearly set on Offroad 6mt but recently found out Sport + 6mt in Canada includes the 3 aux switches. Another tic in the Sport + column.
Thanks for digging up all that valuable information..dealerships had next to no idea.

 

[Jojoedarte]

I’m with you on trying to see what they could actually be used for. I just installed ditch lights from RC and realized these switches are pretty limiting because they are only set up for such low amperage. I didn’t look like they will support the 30 amp light bar requirements.

 

[svaughn76]

I would've liked to have the Aux switches pre installed on my truck but I only took an allocation which didn't have one. Anyone know how I can obtain the cables and aux switches so I can install them in the factory locations. I looked on the accessories and parts page but was unable to locate the part number.

 

[CuriousTaco]

I would've liked to have the Aux switches pre installed on my truck but I only took an allocation which didn't have one. Anyone know how I can obtain the cables and aux switches so I can install them in the factory locations. I looked on the accessories and parts page but was unable to locate the part number.

In the same boat. I was looking around and noticed a few capped connectors in the engine bay and the rear. I couldn't tell if they were for the aux switches. The fuses for the aux switches aren't present where they live in the driver's side engine bay. I think it may be easier to add aftermarket aux switches and run all the wiring DIY instead of trying to integrate the factory equipment.

 

[Bjl0719]

In the same boat. I was looking around and noticed a few capped connectors in the engine bay and the rear. I couldn't tell if they were for the aux switches. The fuses for the aux switches aren't present where they live in the driver's side engine bay. I think it may be easier to add aftermarket aux switches and run all the wiring DIY instead of trying to integrate the factory equipment.

So I took apart the panel where the AUX switches would be if you had it (which I don’t) and I noticed these to plugs going to blank switches, does anyone know what they are for? Of if they go to one of the caped plugs which ones they go to.

 

[CuriousTaco]

So I took apart the panel where the AUX switches would be if you had it (which I don’t) and I noticed these to plugs going to blank switches, does anyone know what they are for? Of if they go to one of the caped plugs which ones they go to.

This question has come up a few times. Myself and others have also discovered these connectors and aren't sure what they go to. Ultimately someone who has access to both an upgrade/premium package truck and base truck would need to validate if terminated connectors in the base truck are the same as the factory aux upgrade switches.

Even if they are the same, there could be other hardware components required to make them functional. When I was looking in the engine bay at the driver side fuse panel it seemed like both the wiring and fuses were missing for the factory aux switches. I don't think anyone has been compelled enough to open up the factory wiring looms and trace the wires to figure out what is what...

 

[MHG]

I am hearing the 2025’s added a 4th switch and increased the amperage.

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