Squirrel Attack on ECM wiring Harness

I am new to forum. Working on my Dad's (96 years old) 2007 Tundra. Squirrels have chewed through the ECM wiring harness. As best I can see Toyota has used the same colored and marked wiring in the harness multiple times making this repair much more difficult. I found the electrical diagrams on the previous threads. I could not find a true electrical schematic on the actual ECM wiring harness, so I can trace out the pin locations. Any help would be appreciated.

 

Post lots of photos is the connector the wiring goes to and the break/damage in the wiring. I will pull up and post the right diagram

 

Hi Jeff
Thanks for the reply. Most of the damage is in front of the passenger side firewall between the A24 ECM connector on the firewall and the the A 45 junction box on the passenger fender well. I will take a closer view tomorrow of the area. I have disconnected the connecer to make it easier to w

 

Yes pretty common area to see rodent damage and a pain to access.

There are some junction connectors behind the passenger side floor kick panel, like under and to the right of the glove box on the side wall of the cab. You can unplug these and pull the entire harness out through the firewall into the engine bay. Will make it much easier to work on. Take pictures as you take it apart. Will help make sure you get all the junctions back together correctly

 

Thanks Jeff
I saw the connectors on the inside of the firewall. I have enough wire to splice without disconnecting the connectors. I uploaded a new photo. The issue I am having is there are like several wires with the exact same color and markings. (2 red, 2 blue, 2 white, 2 brown, 2 pink. 2 orange, all with the same two silver dots close together as a marking. The only way I can see to match these wires up with the correct counterpart is to be able to trace the pin location from one connector to the pin location on another connector. I have not been able to find that level of detail in any schematic yet. Local dealer was not of any help. They had the same schematics shared on this site. Any suggestions appreciated

 

The wiring diagrams on this site are as good as it gets. Those come directly from Toyota. Unfortunately this repair will be pretty time consuming.

You are most likely going to have to use a voltmeter with the continuity setting to put on lead on a wire, then go back to the junctions connectors with the other lead and just start testing pins until you hear a beep or see resistance go to 0. This will show you where the end of that wire falls in the junction. Then you will have to identify it and go hunt up where the other end is supposed to be. You can test on the other end the same way for continuity.

Once you have a match on both ends, splice them together and move on to the next one. Like I said it can be done but will just take time.

I personally think it would be faster to pull all the junction connectors through the firewall so you can easy trace them without having to go back in forth between the cab and the engine bay.

 

Update on Squirrel Attack. Finally had time to sit down and go through wiring schematics provided on the site. Although a bit cumbersome to get through all the info needed was indeed there. I started with the A 24 connector and used this as my starting point. I created a spreadsheet that I have uploaded that helped me. Basically listed all the A24 pins in first column, corresponding wire color in second column, third column was if wire was damaged/cut by squirrels, fourth column was destination/origin of the wire (next connector). Fortunately most of the damage was limited to just a few connectors. I did a search on the wiring schematic PDF for A24 and used this list to find all the needed connector information. I then created a separate tab for each connector and added a snipit of the connector and the connector location in the truck. This provided easy reference for me. Creating the file took just about time as repairing the damage. All repaired today and truck running fine. Thanks for the help Jeff and hope no one has the use the file, but if you have to hope it helps.