I need help to fix the issue I have with 2011 bmw x3 28ix(n52).
The symptom is engine crank but no start.
Code from ISTA:
1B5102 Terminal 15_3, line from CAS, electrical Short circuit to earth
1C5104 Terminal 15N<03: No voltage
1C5104 BSD, message; oil condition sensor: Missing
so I took out the Integrated Supply Module and sperate it to replace box.
oh no... BMW sodered the fuse to the board so that no one can replace it.
I managed to replace the fuse and the car start right away. I thought it is easy fix and called it a day but no.
I locked the door and left for a while. I tried to start it again, I won't start.
The issue came back again.
I pull the code and yes, it's same code. I opened box again and check the fuse, it's blown.
I checked the wire diagram and all lines are connected to DME.
I checked all wires from the fuse box(Integrated Supply Module) to DME and it is all good. No short circuits.
I called a couple of guys to get some advises and they said it may be DME itself. I was rushing to replace DME with used one(programed as well) because I need a car asap.
Replacing DME does not help. I still have same issue.
I'm looking at either Valvetronic Motor or water pump.
The reason is that there is very heavy load that blow the #3 fuse(15 amp) when the car wakes up.
also, the box is control of the power of ignition, fuel injection, and Valvetronic motor according to the document from BMW.
I need your help to resolve the issue.
Please let me know your idea or solution may help me to resolve it.
thank you for reading.