2012 Mirror into 2009+ Truck, wiring in TEMP/Homelink

Edit: I just noticed you had a V6. Post #42 onward really explains what is going on here in the 4 cyl.

 

Yes, I think that misconception started around post 42. It appears however that 4 cyl and 6 cyl have the same issue. I have not found anyone that has gotten this to work regardless of engine size.

The only difference seems to be that one has more wires pre installed.

 

If someone could get in touch with the mirror manufacturer and find out what the expected input range for the thermosistor input that would be a major hurdle covered.

 

I sent and email to Gentex and got this:

Hi Bob,

The temperature feature in the mirror for the 2012 Tacoma is different than previous generations of Gentex' temperature feature mirrors. The temp display is not acting independently with the sensor now, as it is getting information from the vehicle LIN.
It is specific to the 2012 Tacoma and would not work in other vehicles and apparently not compatible with other Tacoma model years either.

We are working on an aftermarket solution to this, using a similar mirror. I'm not sure it is completely set up yet, but should be in the near future.

You could direct people to Mito Corporation (our aftermarket distributor) for solutions in the future.

Mito Corporation
www.mitocorp.com
574-295-2441


Meanwhile, I'm sorry we cannot help further.


Kind regards,

Rob Jenneman
rob.jenneman@gentex.com
Accessory | Aftermarket Business

 

That blows.

 

Correct is is acting off the A/C amp output and I think he means 2009+ here. The ac amp is the same part # throughout and the wiring is almost the same on the v6 models 2009 + except one goes to overhead console and the other to the mirror in the '12

I would tend to disagree here according to post #42. It doesn't work as configured, but it can work given the proper resistance ranges that have been requested. The "apparently comment there means they never tested it so cannot confirm it. I'm pretty sure our tests proved that one sorta wrong. We need an engineer to answer this, but given they are trying to find a solution and making a whole new unit is interesting. He doesn't specify what the new unit to get around the issue is for (2009-2011 or '12 and up)

 

This is a better response than I got when I emailed them a while back. Thanks manho for posting this.

I'm not sure if I'm being a language lawyer here but he mentions 2012 mirrors. I'm wondering if a 2013 mirror will work.

 

Here are some wiring diagrams. Everything looks the same.


2010 ACCESSORY METER
2010 AC
2012 AC

This proves everything up to the AC amplifier is the same. Thermistor values are the same whether you are testing at the thermistor or at the AC amplifier connection.
2010 AC SYSTEM
2012 AC SYSTEM

 

So beyond that what does this mean. I'm not getting it. So this will never work or there still is a workaround perhaps with more information.

 

Well if I can get my hands on a 2012 mirror without paying $600 I'll work on it. Lol. I'm 99% sure the AC amplifier is the culprit. That's an $80 part.

 

I bought mine off of Tacomaworld member "rodrigogudino". He had a bunch of them for sale a while back on the Buy - Sell forum for well under (if I remember right less than 1/2) the $500 price you mentioned.

Maybe try to PM him, he was a very good guy to deal with with excellent communication.

 

I tried messaging him but I believe he is still out of town.

 

An $80 part that is the same in the v6 and 4 cyl. So....please spend that $80 on beer, dinner and the last $3 on making the wiring the proper resistance as this seems to be the issue here.

http://www.tacomaworld.com/forum/4-...le-2-7-4-cylinder-possible-2.html#post5599880

 

Is it the same part number between 2012 and 2011 models? It's not a V6 or 4 cyl issue, it's a year issue.

 

If you wire a 2012 mirror into a v6 2010 tacoma you get proper temp......it's not a year issue it's the wiring issue between the models. Read post #42 again. You may have missed that 4cyl gets a value when outside temp is very low, but it is way off (shows 120+ degrees). This temperature is run off a resistance value. I've seen this happen on my own truck following the original post directions.

Opinion:
The only difference after the AC amp in all these cases is the wiring which alters resistance values. No one has yet to mimic each and every wire connector in the v6 on a 4cyl creating a proper wire resistance as a base for proper diagnosis. Particularly the IN1 and IN2 connectors near the drivers side where the temp wire runs through.

Thanks for adding to the discussion dibble as I don't think anyone is right including myself until I see it work with my own eyes.

Edit: The biggest issue here is we need a v6 to test dibbles suggestion on and we all have 4 bangers

 

Ahhhh ok, I mis-read that then.

What about if we were to measure the resistance between the AC amp and mirror in a 2010 V6, then do the same in a 4 cyl and compare the results?

 

See my edit and the issue with that above.....

 

When looking at the wiring diagrams you can see the temp passes through two separate connectors in the drivers side before heading up the a pillar. All of these combine with the stock wiring must be creating a certain resistance value. Unless there is some resistor pack hidden in all of that jumble. Need a few days with a 2009+ v6.....anyone know somebody?

 

I just measured resistance on the temp line between the AC amp and overhead console on my 2010 V6. It's a straight shot, no added resistance.

EDIT: reading over the entire thread again I know that the temp line between the AC amp and mirror is a straight shot as my measurement shows. (Part of the mod was running a NEW wire for this signal on regular cab trucks). The only other area to look are the temp wires that go from the AC amp to the temperature sensor.

 

Just a though. I'm no automotive electronics expert, far from it. Have you tried grounding the negative terminal and just running the positive to the 2012 display? I have no idea if it would work and you may have already tried it, but if the temp is measured using a thermocouple, perhaps it could be grounded and have the positive connect to the display if the display is also grounded.