FMU Wiring Question

[Devbot]

To those with a field monitor unit, I'm having some confusions when it comes to the air temp sensor and how you guys wired it in;
So I'm aware the yellow/black and blue wires are what lead to the sensor, but how is one supposed to connect these wires if they're missing the pigtail? I know there's a way around it as many have bought their sensor brand new from Toyota but seemingly nobody mentions what they actually did to hook it up. The most I've seen in way of an explanation is literally this single picture in this YT write up, of what looks to be butt splicers or something connected to the pins.
Is this something along the lines of what you guys did, or did you just source the pigtail and go from there? I've searched all over trying to find the female end and have only come up empty handed, so if it's the latter option I could use some direction for where to look. It sucks when half the write-ups out there are 10 years old and now missing the photos they posted :doh:
The aforementioned picture:

 

[HiluxSurf SSR-G]

i think, most of those who installed the FMU bought it together with the sensor coming with a pigtail harness. So all they had to do was splice the wires.
perhaps you can trace the part number of the connector from the EWD of the specific vehicle where that sensor is used

 

[Devbot]

i think, most of those who installed the FMU bought it together with the sensor coming with a pigtail harness. So all they had to do was splice the wires.
perhaps you can trace the part number of the connector from the EWD of the specific vehicle where that sensor is used

The problem with that is, or at least what I've run into so far, is the pigtail was never sold as a part and has no corresponding p/n, and if I'm not mistaken it's apart of the main body harness. If so, the only option would be to find someone who has snipped off this very particular section from the rest of a complete harness off a JDM vehicle for some strange reason and has decided to try and sell it secondhand... which is pretty unlikely in my eyes. In fact I don't think I've seen a single used one for sale over the past couple weeks I've been gathering info, only new parts for sale. I would imagine that's because they're reportedly destroyed very often and very easily in collisions, or at least that's what the FMU importers/exporters say. But then again, people had to have gotten them that way in the past so perhaps I'm overthinking it here.
If I'm not mistaken I believe the sensor was used on Hilux's, Surfs and Prados, but I'm not entirely sure because it's apparently information Toyota refuses to disclose, or at least makes it very hard to find. Not a single parts dealer mentions what used this sensor - literally any other ambient temp sensor Toyota has made? No problem. This one in particular? Asking a little much here, I guess.
Searching part numbers gets you relatively nowhere as Toyota used very similar part numbers for various other sensors (mostly coolant from the looks of it), AND seemingly used a new ambient temp sensor on every car they've made; of course none of which use the same plug and are all different sizes with different keyways. So google just ends up throwing you handfuls of parts that aren't related at all, and then tons of recommendations based off these irrelevant parts.

 

[UnderFire]

The same unit and sensor was used in some Subaru Foresters sold state-side. There is a lot more information under Subaru forums.

 

[Devbot]

The same unit and sensor was used in some Subaru Foresters sold state-side. There is a lot more information under Subaru forums.

So I looked into this, which lead me to a different style of sensor used by all the Japanese companies as well as GM, and long story short I ended up on some Ukrainian forum discussing these sensors as it now has several part numbers; 077500-5191, 25687483, 88625-32171, 88625-48021, and 88790-22131 to name a few. All of course with varying prices for whatever reason, from $13 to $45. :tsk:
Anybody using one of these, just to confirm?

 

[HiluxSurf SSR-G]

yes, you're right. the sensor is only used on Hilux Surfs (N185) and Prados (J95).
dunno about the Subaru version though.

 

[HiluxSurf SSR-G]

from a friend who works at a Toyota dealer:

Connector P/N --> 90980-11255
Wire 1 --> negative
Wire 2 --> positive

1 & 2 are indicated in the connector at the end where the wire goes into the connector. You may need a magnifying glass to see it
Hope the info is correct. good luck!!

 

[Devbot]

from a friend who works at a Toyota dealer:

Connector P/N --> 90980-11255
Wire 1 --> negative
Wire 2 --> positive

1 & 2 are indicated in the connector at the end where the wire goes into the connector. You may need a magnifying glass to see it
Hope the info is correct. good luck!!

Unbelievable, thank you so much. :clap2::clap2::clap2:

 

[spartacus]

Unbelievable, thank you so much. :clap2::clap2::clap2:

This thread might help.
Electrical help - exterior ambient air temp sensor wire

 

[Devbot]

This thread might help.
Electrical help - exterior ambient air temp sensor wire

Oh my god I feel like a dumbass, I totally forgot that plug already exists on my harness :doh::doh: Since I don't have a Limited I tucked it away a long time ago and forgot about it. Welp, I'm already in it now as I bought a connector this morning so guess it will remain tucked. Thank you anyways! Those sensors are much cheaper than the one I bought so if it dies out in the future I might snip that end and do it over

 

[phattyduck]

Yup, use the sensor that is on your vehicle - the wires run up into the cabin in the factory loom already for you!

The factory AC temp sensor for the limited has a different key, but once that is taken off it plugs right in.

I had an extra harness, so I put pins in the dash side of the connector, so it even runs through the factory plug...

-Charlie

 

[Devbot]

Yup, use the sensor that is on your vehicle - the wires run up into the cabin in the factory loom already for you!

The factory AC temp sensor for the limited has a different key, but once that is taken off it plugs right in.

I had an extra harness, so I put pins in the dash side of the connector, so it even runs through the factory plug...

-Charlie

Oh so if I still have that connector in place I can plug in the sensor and use it as is, and avoid having to tap in a new one directly to the white plug? That's pretty convenient if so. I was under the impression you'd have to tap one in directly even if you still had that connector attached
Or are you just saying the legwork of routing the wires is done for you, and it still needs to be ran to the white plug? Sorry if this is a dumb question

 

[phattyduck]

Or are you just saying the legwork of routing the wires is done for you, and it still needs to be ran to the white plug? Sorry if this is a dumb question

With an SR5, the wires end right at the plug where the dash harness and engine bay harness connect. You will need to get the connection from there up to the FMU itself with new wires in the a-pillar. You need to run a speedo wire up there too, so it shouldn't be that much extra work.

Heck, I don't have a sunroof, so I had to run a bunch of wires up there... (and it was hard to find a non-sunroof FMU housing)

-Charlie

 

[HiluxSurf SSR-G]

OT sorry.
May I know what is that black circular thing with a plus sign to the right of the pic?

 

[Devbot]

OT sorry.
May I know what is that black circular thing with a plus sign to the right of the pic?

I've also always wondered what that doodad is, it's in the passenger wheel well

 

[HiluxSurf SSR-G]

isn't that in the driver side?

I've also always wondered what that doodad is, it's in the passenger wheel well

 

[Devbot]

isn't that in the driver side?

Oops yeah driver, got all turned around in my head

 

[blarchitect]

this single picture in this YT write up, of what looks to be butt splicers or something connected to the pins.

I took that picture many many years ago. You are correct that is butt connectors. The sensor has spade connectors only.

 

[phattyduck]

OT sorry.
May I know what is that black circular thing with a plus sign to the right of the pic?

Vacuum canister for the ADD system on the '96-'00 4Runners. The front diff actuator is all electric on the 01/02's.

-Charlie

 

[Devbot]

I took that picture many many years ago. You are correct that is butt connectors. The sensor has spade connectors only.

Oh no shit? Small world, it is :boink: