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

Whats covered in this guide:
Running Homelink and Temp output to the 2012 Mirror in the 2009+ trucks.

What's not covered:
How to install the mirror itself. This is covered in other places on the forum. I'm also not going to go over the wiring diagram itself or how to disassemble your truck. These will be the pinouts only. The wiring diagrams can be difficult to read and it's my goal not to confuse you.

Parts Needed:
For Reg cab only:
1x Pin kit for connector A-14 P/N 82998-12870 + Press Sleeve (Crimp) 8299-12020
For all trucks:
2x Pin kit for connector I8 82998-24290 + Press sleeve 8299-12020
(these are used to get a wire into the connector, their use is pretty straight forward, you crimp in your wire and insert it into the blank pin where specified)
Some Automotive thin gauge stranded wire available at any autoparts store. You'll need about 10 feet for Regular cab trucks. Much less for V6 trucks.
Various taps/crimp connectors.

In 05-08 trucks, the temp sender will not work, at least I haven't found a way to make it work. It's a two wire resistor type temp sensor meaning you have two wire inputs (+/-) that need to be connected to the temp display.

2009+ Trucks looks for a temp on a single wire in pin 12 of connector I8, this connector is found in the headliner of all 2009+ trucks (reg cab, dbl, access). This is the connector you'll plug into your new mirror to get your 2012 mirror working with the back up camera.

The only problem is the 2009, 2010 and 2011 are missing this circuit from I8. These circuits exist in the v6 trucks in plug A28 Pin 5 that plugs in to your overhead console to display temp. This circuit is completely missing from the regular cab trucks. FEAR NOT MORTALS FOR I HAVE A SOLUTION FOR ALL OF YOU!

On the V6 trucks you simply tap into the wire that runs to your overhead console temp display(Pin 5, connector A 28) and run it down to pin 12 of your I8 Connector. Very simple.



For the Regular cabbers like myself, we'll need to get a little more involved. You can get the temp signal from Pin 27 of Connector A-14 at the A/C Amplifier. The bad news, is this connector is up under the dash. You'll need to run this wire through the dash to the pillar and up into the headliner to get it over to pin 12 on connector I8.



To get homelink to work you need to run 12v+ Constant to Pin 8 of the I8 Connector, I'll leave it up to you where you want to get this from. I recommend the cabin light, that way if you need to open your garage without the key in the ignition you can. You may choose to run this to ignition powered source so if someone breaks into your truck they can't get into your house without the key.


Hope this helps. Let me know if you have any specific questions about the modification. I figure if it's there, it should be fully functional. If you somehow manage to destroy or fry your truck, that's your problem. I'm assuming you have some basic automotive electrical skills.

 

Great guide!

 

subbed.

 

Nice write-up! Even after 6 months of driving this truck, I still find myself looking at the mirror to see what the outside temp is since that's how my last vehicle ('04 Wrangler) had it. This mod is definitely on my list.

 

Also, if you're looking for the cover that covers the wire from the mirror to the headliner, the part number is 87818-04010, shouldn't run you more then 8 dollars, if you pay more they're ripping you off!

 

To get Homelink to work with the ignition "on" can i just tap into the thick green wire in the I8 connector and bridge it to pin 8? If that makes sense..

 

Blackseven, many thanks for posting this as I have been wanting to try this for some time.

One quick question, is the A-14 connector tough to find and identify? Any quick tips?

 

Pull off your glove box and look up under there, there will be a black box with a connector plugged into it, That should be A-14.

 

Many thanks Mike - I look forward to ordering the parts and getting this done!

 

I just tried this mod on my 2010 4cyl access cab and it didn't work (at least the temperature does not read out and there are only 2 bars where the temp should be displayed). The compass and backup display does work.

To confirm, you use 2 terminal repair wires (Part #'s 82998-24290, 82998-12870), connect these to pin 27 on A-14 and pin 12 on I-8 and then run a thin gauge wire between the 2 connections.

For pin 27 on A-14 is there any other existing wires in the connector? It's really tough to determine the pin #'s on the connector - the one I used was free but had wires on either side.

Any advice you can give?

 

bump for an answer

 

Sorry we were talking via pm. I tried using a 2012 temp sender to see if I could solve the problem. Thats not the solution. They're the same part. I need an oscilloscope to really find the problem ... And correct it. I think its a difference between what the ac amplifier is putting out and what the mirror is looking for signal wise. If I had a 2012 wiring manual I could probably come up with a solution. I only have the 2009 manual.

 

sounds good. I know im in no rush but i would like to know what comes of it whenever you figue it out

 

How much does the wiring manual cost? Can you buy portions/sections of it? Please let me know as I'm really interested in finding out if getting the temperature to work is possible.

 

Normally it would be here: http://www.helminc.com/helm/search_service_owner.asp?Style=helm&class_2=TOY

But I don't even see the 2012 listed yet.

The 2009 manual I have I got lucky and picked it up on ebay for about 40 dollars. Alternatively the techinfo.toyota.com site will give you access for 15 bucks for 48 hours. It has the information, but I've extremely frustrated using this site as I can't save anything if I need to reference it again later. So I refuse to use it at this point. They may feel their information is invaluable, but I paid alot of money for my truck. I feel that this information should be free to owners.

 

When the 2012 diagrams do come out, and you feel confident that you would be able to figure out how to get the temperature readout to work, then I would be willing to throw in a few bucks for the diagrams.

 

i cant seem to locate the:
"Press sleeve 8299-12020" on Champion, can someone point me to this part?

 

I am having more issue with the mirror's harness trying to figure out what the 12 wires are for. I need the pins for connector I8 detailed. I don't see them.

 

There are 9 wires used in the 2012 I8 connector on the truck. There are 12 pins in the mirror harness which all go into the mirror and are filled. This leaves 3 unused wires. The wires in the mirror harness unused are as follows:

Pin #4: Orange
Pin#5: Red
Pin#10: Purple

Now to figure out what what the mirror wold use these for as the truck doesn't seem to output to them as factory configured. I wish gentex had pinouts for these mirrors on their site.

 

I cut a Target pill bottle (plastic) in half (or more) and painted it black until I found the cover. I think I paid like $13. or so.