3rd-Gen Tacoma OEM Mic Adapter

And thank you so much for building this really cool adapter. Still no issues at all with the max 10 amp add a fuse holder I replaced your ATC one with. The head unit hasn't blown the 10 amp fuse yet, doubt it will. Even if it does I'll just risk it and put a 15 amp (as the Sony had from factory) mini fuse in the socket, on such a short cable run I doubt It'd really matter.

 

Man I would buy this in a heartbeat. Aftermarket mics look so janky.

Any idea when/if these will be back in stock?

 

Yes, 2020 introduced etune 3 and CarPlay/AA. The 2019’s will be the same as 2016/2017/2018.

I'm wary of overstepping on OP's thread but I thought it might be worth mentioning that your radio circuit is fused upstream of your head unit in the in-cab fuse box. It might be as low as 7.5 amps there. Perhaps that helps you with any discomfort about your 15 amp to 10 amp fuse swap? I wouldn't worry about it no matter what, and the smaller gauge wire is no problem for a short run to a < 2 amp device.

 

So, it is entirely possible (even easy) to stuff an aftermarket mic in the OEM mic location _if_ you take the time to route the cord up the pillar and over the headliner. That's how mine is, sits in fine with some closed cell foam sandwiching it in place, works great. The OEM mic is a bit cleaner, snaps in nice, and allows quick release so it's a superior option if audio clarity is the same. I plan to test that out a bit before deciding.

Just wanted you to know there is a good alternative to an aftermarket microphone in a visible location.

One really nice thing about this product is it eliminates the time wasted doing all of that.

 

You're welcome!

Regarding the 10-amp/15-amp fuse, the amperage ratings on add-a-fuse/add-a-circuit fuse taps are for the auxiliary circuit, which in this case, is connected to the Tombit mic adapter, which only draws ~13 milliamps (0.013 amps.) The innards of the fuse tap contain metal contacts that are directly connected to the primary fuse and one leg of the auxiliary fuse. The limiting factor in these taps is the gauge of the wire that's connected to the other leg of the auxiliary fuse and that comes out of the tap to supply power to the auxiliary circuit. The manufacturer puts a max amperage rating on there because they don't want someone trying to power an amplifier that needs 30-amps from the auxiliary side of the fuse tap, especially when the primary circuit might only be rated for 10 or 15 amps.

The general rule of thumb regarding add-a-fuse/add-a-circuit fuse taps is to be sure to use an auxiliary fuse with an amperage that's rated significantly less than the primary fuse so as not to stress the circuit the tap is connected to. Personally, I tend to limit my use of fuse taps to auxiliary circuits that draw 3 amps or less. If I start needing more power than that, I start thinking about using a relay in lieu of a fuse tap.

All that to say, it'd be perfectly acceptable to put your 15-amp fuse into the primary circuit slot of the fuse tap. Hope that helps!

-Tom

 

Currently working on procuring more PCBs and harnesses. With the semiconductor shortage I need to make a slight revision to the PCB before sending it off to the board house.

The PCBs and the harnesses are always the long pole in the tent so once I hear back from the board house I'll have a much better idea of when these will be available again.

I'll drop a note in this thread to update folks when I know more.

Thanks,
Tom

 

Ahh son of a b****! Damn you, Toyota. I mean, kudos for updating Entune, but damnit the wiring harness won't work with this adapter!

I don't want you (WickedAx) to eat payment and shipping costs because I took a risk and ordered. I'll just sell my unit to a forum member to recoup my costs, and wait for you to make another adapter. You cool if I sell this myself to someone?

 

If Tom(bit) is cool with it, I'll sell you my unit at cost. I did't install it yet, but was just informed it won't work with my 2020. I'm still buying one when a 2020 version comes out, the quality of the part is top notch. DM me if you're interested

 

Solid offer, thanks man!

After reading your comment (and skimming OP) it seems this might only work with 2019 and below?

My truck is a 2021, if it works with that I absolutely will take you up.

 

Good job op. Love to see the beginnings of something new, flourish. Keep goin!

 

You're in the same boat as me, I'm afraid. No worky on a 2021 (yet?).

 

Sorry the delay in responding, @MahTV as I just saw this. I don't have any issue with this.

Thanks for asking!

-Tom

 

@WickedAx, you think the adapter is functional for a 2020, but it's just a matter of changing jumper positions on the wiring harness? I'm using a maestro, so I can patch into it's harness between the HU and jump wires with your adapter, if you know the positions. I'm happy to be a guinea pig here.

 

Received my Tombit on Friday and installed it today (Saturday) on a 2019 Tacoma without any issue on a Joying HU.

Verified OEM mic was working by covering up HU mic. Picks up drivers speech much better.

Great product! Thank you Tom.

 

You're welcome! I'm glad to hear you're happy with it! Thanks for the feedback!

 

Hi @MahTV,

Yes, I do think the adapter will be functional with the 2020 trucks (and later model years) once I procure a new harness. After reviewing the vehicle wiring diagrams for these later model years, it's apparent that not only did Toyota change the OEM head unit and consequently the display and radio receiver harness, they've also added a telematics unit as an option to some trucks. This telematics transceiver module is for Toyota's SOS system (similar to GM's OnStar system.) Toyota's SOS system has been around for the last decade and has been offered in various Toyota models over the years, but was just integrated into Tacomas with the 2020 (and later) model years.

According to the wiring diagrams, trucks with the SOS functionality have the SOS telematics transceiver in between the telephone/mic module and the OEM head unit. I'm still researching but at this point, it looks like the power requirements of the telephone/mic module have remained the same and it appears the only change I'll need to make to the adapter is to source a new harness that supports the new display/radio receiver harness connector (for both the head unit and vehicle sides) and pinout. I'm currently working on this and as soon as I'm able to procure some of these new harnesses, I'll be happy to send you a unit to test with. Not sure how long that will be but I'll be sure to reach out once I've got a prototype unit ready.

Regarding patching into the maestro harness, I tend to avoid encouraging this because 1) I don't know a person's skill level and 2) I'd feel awful if someone fried their Maestro or worse, their truck's electronics. It's also the reason why I discourage people from cutting the add-a-fuse and modifying it to pull power from somewhere else in the vehicle. Fact is, I'm sure the majority of the folks on this forum are easily capable of doing that but again, I don't know who is/who isn't.

Thanks for reaching out!

-Tom

 

Good to know the reason. I bought a 15 amp mini add-a-fuse and was going to change the connector to work with a Kenwood head unit, similar to what a poster above did. I plan to solder the wires together and shrink tube the connection. I’ll let you know how it goes. With the fuses and the ground, I’m not terribly concerned about frying the electrical system, but fingers crossed!

 

Awesome man. If you just wanted to send the harness component, I can at least strip from your original <2020 harness and T-tap into the new one you provide. You've done all the hard work with the circuit, and I should just dig into the wiring harness schematics and see which pin-outs to target, but you've got the hours into the research.

The Maestro harness is just a bridge, and the pins to the mic are unused slot. It's really not be a thing to plug into, I'll just pull your pins and pop them in the new sockets. You PM me the pin digits, and I'll take on the risk and let you know the results. Either way

 

Shhh.. I didn't tell him I was doing this too so the adapter will work for my Excelon.

 

Following this tread.
Hopeful for a 2020 radio adapter.