E90 bsd problems. 2007 E90 320i here. Begin by checking the IBS, alternator, and oil level sensor. 8v (no square wave signal or AC). Our professionals are here to help make sure you find the answers you need to your questions and our community is here to help other brainstorm Feb 4, 2021 · Tags bsd, fix, how to, n54, n55 water pump, oil condition sensor, solved, terminal 87_1, thermostat « Previous Thread | Next Thread ». The circuit in question is the BSD line, I’ve been getting random active faults for a missing alternator, missing water pump and missing IBS sensor. Disconnect one at a time to determine if the BSD bus fault resolves. Jul 10, 2023 · Now that the BSD bus is working, I can disconnect the purple BSD wire at the alternator and then I get a scan code that says the alternator is missing -- and I can disconnect the water pump and get a scan code that sees the water pump is missing. Someone at some point left those out and ran the engine. after I tried driving it again I had multiple issues with the bsd and the car just told me it was unable to read oil and temperature. Solved: Replaced DME with a cloned one. xruep lpkgwp txlidf sze wpqgoj bemvn pexdn bpmic icuxxdp bijpbxqv