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05 + Tacoma IFS T case swap wiring instructions

August 25, 2017

So you have swapped out your electronic T case in your 2005 Tacoma for the FJ Cruiser T case but you need to get your front Differential to work again. 

 

 

 

Here are the instructions to get that front ADD to work.

 

First we’ll swap some wires around to get your sensor lights to work.  There are two variations depending on Model year of your Tacoma.  Basically you will need to cut the 4wd indicator light wire, 4lo indicator light wire, 4wd sensor wire and 4lo sensor wire then connect them to the appropriate wires.

 

Here are the two plugs at the 4wd computer found behind the glove box you'll need to find the wires you'll need to cut and use.

 

 

 

05-08 Tacoma wiring

Connect 4wd sensor wire (red w/ blue stripe - B 22) to the 4wd light wire (solid red - A 19)

Connect 4lo sensor wire (yellow w/ black stripe - B 17) to the 4lo light wire (brown w/ white stripe - A 11)

 

08-11 Tacoma wiring

Connect 4wd sensor wire (red w/ blue stripe - B 22) to the 4wd light wire (grey w/ black stripe - A 19)

Connect 4lo sensor wire (yellow w/ black stripe - B 17) to the 4lo light wire (brown w/ white stripe - A 11)

 

The final step is to confirm that you have the sensors installed and connected properly at the transfer case.

The 4wd sensor will go into the passenger side of the transfer case and the plug should have two wires (red w/ blue stripe and white w/ black stripe).

The 4lo sensor will go into the drivers side of the transfer case, be careful though as it will go into the opening closest to the front of the truck, and the plug should have two wires (yellow w/ black stripe and white w/ black stripe).


Now you can turn on the ignition and test to make sure the dash lights work correctly when you shift the transfer case.

LEAVE BOTH CONNECTORS UNPLUGGED FROM THE 4WD ECU!

 

THIS NEXT SECTION IS FOR ALL OF THOSE THAT HAVE MADE THIS SWAP INTO AN IFS TRUCK.

 

Ok so now that you've got your dash lights working properly you need to be able to engage the ADD for the front differential. Here we will outline the simplest way to achieve this however I'm sure there are quite a few different options as far as switches go.

 

This write up will describe how to wire it using a Carling DPDT Momentary switch (Double Pole Double Throw Momentary switch).

 

 RockSolidToys Has the Carling switch you’ll need for this swap. Just email us at wyatt@rocksolidtoys.com    or call 714-460-3491 Monday Through Friday 9:00am to 5:pm PST.

 

All the wires you will need to tap into are located in the same two plugs you disconnected from the 4wd ECU in the previous post.

 

If you purchase the switch from RockSolidToys we will send a diagram that illustrates whats what for the switch connections, and will label each connection with a number. This write up will use those numbers to correspond with each wire it connects to.

 

Here is the illustration of the switch.

 

Diagram of the two plugs removed from the 4wd ECU

You will need to take the solid red wire and the black w/ white stripe wire and branch each of them into a Y, each wire will need to terminate in two separate spots on the switch.


All Tacomas 05-11

# on plug diagram - wire color - location in factory plug

1 -red - B 3
2 - purple (IGN +) - A 5
3 - black w/ white stripe - B 4
4 - black w/ white stripe - B 4
5 - white w/ black stripe (GRND -) - A 6
6 - red - B 3


The next step will be an indicator light to tell you when the ADD is "locked" or "unlocked". You can either use the indicator light that's built into the switch or wire up your own light for this.

To use the light that is built into the switch these are the terminations you'll need to make.

7 - light green w/ black - B 26
8 - purple (IGN +) - A 5

If you choose to use your own indicator light you will need to power the light with an IGN hot wire, then run the ground wire to the light green w/ black stripe wire.


Now turn on the ignition and test it out. You should be able to rock the switch one way, hold it for a few seconds until the indicator light comes on then release. The ADD is now "locked" for 4wd. Then rock the switch back the other direction and hold for a few seconds and the indicator light should go off.

The ADD is now "unlocked" for 2wd.



LEAVE BOTH CONNECTORS UNPLUGGED FROM THE 4WD ECU!

 

So there you go.  You are now set to wheel without worry of having your t case stuck in 2wd leaving you stranded in the middle of no where.

 

For more information on this or if you need the complete harness and switch for your vehicle, please contact us at info@rocksolidtoys.com or call us Monday through Friday 9:00am to 5:00pm PST.

 

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