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Wiring - Tying into TJ harness (Part 1)

 

So now we know what each connector is for and where the wires need to go. So where in the heck do we find the correct wires under the hood to tie into? That's easy once you've read this!

Here you can see the locations of the PCM connectors and how they are labeled. Connector 1 has pins labeled Axx, connector 2 has pins labeled Bxx, and connector 3 has pins labeled Cxx. (We don't actually tie into any wires that run from connector 2.)
 

 

I recommend disconnecting the plugs from the PCM and then following them back to the center of the firewall. Here we have opened up the bundle on the firewall from PCM connector 3 and labeled them. You will only need to identify the brake switch sense wire. (I do not recommend connecting the CCD bus or SCI transmit wires. Read more on this later in the article.)


 

 

Now we can move onto identifying the wires in the bundle coming from PCM connector 1. Once again we need to refer back to the chart to identify the correct wire color. Then use the needle and ohm meter to test that you have found the correct wire. Here are the wires that need to be labeled in this bundle:


 

Now that we have identified all of the correct wires lets see what it takes to tie it all together!

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