I ran a scanner on my jeep because it would not start and I had multiple lights on the dash. The scanner showed no communication to anything transmission, air bags, etc. I bought a new Tipm from the dealership and had them program and install it. They came back and told me I needed a headlamp to dash harness and a chassis harness and that would fix it. I wasn't willing to pay them $1500 for the parts and the install so I did it my self and sure enough it didn't fix the problem. I'm thinking its the other harness that runs off of the tipm but I'm not sure what its called. I would love to hear any thoughts/recommendations.