An intentional electromagnetic interference (IEMI) source has been reconstructed by using the dipole moment. The automotive simulations with the equivalent dipole can accurately characterize the costly IEMI experiments. Based on the measurement, the least square method is applied in source reconstruction. Importing the reconstructed source and the full-scale car model in simulation tool, fields inside the car are obtained. By comparing the simulation result with the experiment data, the automotive simulation model for IEMI is validated.