There is not a relay specifically for the BCM. I attached the wiring diagram to show the three fuses that the BCM has. This vehicle has the BCM and Junction block connected. They can be separated but they are installed as one unit.
Are you looking to disable the theft system or trying to do something else. Most likely the start then shutting off about 1 second later (if that is what yours is doing) is most likely caused by the theft system. It will allow it to fire then it will shut it off.
If this is the case, we need to figure out why the theft system is active. I included the description of the system to try and help better understand what it is doing.
Have you tried unlocking the vehicle from multiple doors using the key including the trunk? This is a way to disarm it.
Let me know and we can go from there. Thanks
Images (Click to enlarge)
Saturday, July 13th, 2019 AT 7:49 AM