What warning lights are present (or intermittently present) on the Instrument Cluster? ABS? DSC?
BMW Part# 61366915327 is a Relay used on several engine systems such as VVT. I do NOT see any relationship to DSC/ABS issues:
http://www.realoem.com/bmw/enUS/part...&q=61366915327
If I were diagnosing the issue you describe, I would want to know:
1) WHEN were the codes saved in memory (at what mileage/km);
2) WHAT FF Data (Freeze Frame Data) other than mileage is available for each code?
3) Does Each Code light a warning light on the Instrument Cluster?
4) Is EACH code currently present?
5) If you clear the codes, can you drive for a distance before any warning light appears, and when a light appears, what codes are present (along with FF Data)?
I would want to know if the problem is an intermittent wiring/connector fault, or constant, and the data described above is used for that purpose.
INPA would tell you all the answers to questions above. If Pro Tool is any good, it should too, but I use INPA & NOT Pro Tool, so can't say. INPA will also give you "Real-Time" readout of wheel speed and Rotation Direction of EACH wheel, so you can see if each wheel speed sensor and its associated wiring is working, at least intermittently.
First thing I would do is check the Fuse, F22, that provides power to the Longitudinal Dynamics Management (LDM). That circuit is shown on this TIS circuit diagram, and the LDM Installation Location is shown in the next link:
https://www.newtis.info/tisv2/a/en/e...nt-ldm/ehJTo63
https://www.newtis.info/tisv2/a/en/e90-325i-lim/SDIfnXV
Reason to check that, and if fuse intact, check Connectors indicated in schematic, is that your first code, D35B, is saying that the DSC is NOT getting a signal or "message" from the LDM ( at LEAST sometimes ;-), which it should receive via the PT CAN BUS. Here is the Circuit diagram for the PT CAN BUS, showing the Red, and Blue/Red wires between X14282 at the LDM, and Connector X18303 at the DSC (check continuity of wiring, connectors DISCONNECTED & battery disconnected):
https://www.newtis.info/tisv2/a/en/e...x10545/f3dkLXn
Here is the "Connector View" for Connector X14282 at the LDM:
https://www.newtis.info/tisv2/a/en/e...i-lim/CSzCi4FI
Please let us know what you find,
George