F10 520d fails to start, no engine cranking, drivetrain stabilisation failure, and flat tire monitoring issue.

[Ziinsig]

Greetings everyone,

I am experiencing a problem with my F10 520d; it exhibits no cranking or starting. The only errors shown on the dashboard are:

    Drivetrain Stabilisation (DSC) malfunction Flat Tyre Monitor (FTM) malfunction

(and some illumination deficiencies due to the use of LEDs)

The vehicle fails to crank or start, while the ignition activates properly. I have conducted a scan of the vehicle, and the trouble codes are shown below.

The problem occurred last week when I had a slow puncture fixed while the ignition was on. Following the installation of the tire, the vehicle began to misfire, accompanied by DSC, FTM, and battery malfunctions. After parking, the automobile failed to restart. I left it for a little while, and it resumed functioning without any issues. Over many days, the issue persisted, but I ultimately managed to start the vehicle by either rousing it from sleep mode or swiftly deactivating the DSC prior to driving. The last instance in which I successfully used it included jump-starting the vehicle. However, it then stalled while I was driving and has not begun since; I had to arrange for recovery to return home, since I was far from my residence, which necessitated the journey.

I have attempted the following so far:

    Replaced the battery; nevertheless, it had no effect. Notably, my old battery had a value of 11-11.8v, perhaps indicating a parasitic drain.
    Disconnected the battery for 15 minutes; the device still did not start.
    Attempted to jump-start again; it is no longer effective.
    I replaced the aftermarket instrument cluster with the original, however it did not provide any improvement.
    Disassembled my aftermarket infotainment system; it yielded no improvement.
    I have attempted to reset the vehicle several times, but the drivetrain problem and FTM issue persist.
    Disconnected IBS sensor; the system remains unresponsive.

My perspective:

    There may be a faulty ground connection, but I am uncertain where to begin troubleshooting. Any suggestions?
    The wheel sensor has malfunctioned after the tire repair, resulting in a series of complications. I have purchased the replacement component and am awaiting its arrival; it is the next item on my agenda for replacement.
    My DME may be nonfunctional.
    My IVM may be nonfunctional.

Before investing further funds, does anybody have suggestions for effectively troubleshooting this issue?

[Startle]

ISTA assists by generating test plans, enabling you to identify issues and discern common connections in circuit diagrams.

[Ziinsig]

Indeed, you are correct on ISTA. I have had the misfortune of my laptop battery failing simultaneously with my car's breakdown, necessitating the makeshift connection of four extension wires to power the laptop from my vehicle. I believe I am approaching the problem; I first believed I had discovered the solution, but I am no longer quite certain.

ISTA's operations provided a more explicit understanding of the situation.

[Ziinsig]

I own an aftermarket screen that explains the absence of the CID; yet, ISTA indicates that the vehicle has lost contact with the DDE and EKPS.

    S0237: Communication with EKPS is not feasible. S0392: Communication with Engine Electronics is not possible.

I needed to verify if the fuse linked to the DDE had blown in this wiring diagram.

[Ziinsig]

[Ziinsig]

However, I neglected to remember that all the schematics pertain to LHD vehicles, and while opening the box on that side, I inadvertently accessed the compartment that holds, I think, the gasoline relay. The box was partially filled with water, resulting in severe corrosion of the relay terminals and relay owing to total submersion.

[Ziinsig]