sienna 2015 starts for 3-5 seconds and turns off. using t harness from MPC and RF442

Question

Sienna shuts off in 3-5 seconds, using a T-harness and RF442 kit. I only did a plug and play no splicing of any wires and flashed using the flashlink 4. Second issue, My RF keys start and remote start both my lexus and sienna, installed back to back and somehow they pick up on both signals. Need help, do not know where to start.