Bit Serial Data Interface Bmw 3
Hello, I have a 2006 bmw 525 E60. Car came in with a start and stall condition CAS/EWS system checked out ok, after clearing multiple codes 2 kept coming back 2f0d radiator shutter and 2e7c bit serial data.
This car is not fitted with shutter control i assume this is an erroneous code. Concentrating on 2e7c. Unplugged the water pump car starts and runs. Plugged a new water pump while engine is running. Engine shuts right down.
Thinking maybe I have 2 water pumps with the same problem connected a blower motor on the water pump circuit runs the motor no problem. Intermittently having the alternator plugged in causes the same problem. Now I unplug BSD components 1 by 1 clearing each time 2e7c keeps coming back. All BSD's now unplugged still get 2e7c. All body ground connections are ok. Positive cable recall was done, checked positive connection at jumper location. Anything I'm missing aside from wiring which as far as I can tell is ok.
Any help in this matterv would be greatly appreciated.Thank you. Hello, I have a 2006 bmw 525 E60. Car came in with a start and stall condition CAS/EWS system checked out ok, after clearing multiple codes 2 kept coming back 2f0d radiator shutter and 2e7c bit serial data. This car is not fitted with shutter control i assume this is an erroneous code. Concentrating on 2e7c.
Unplugged the water pump car starts and runs. Plugged a new water pump while engine is running. Engine shuts right down. Thinking maybe I have 2 water pumps with the same problem connected a blower motor on the water pump circuit runs the motor no problem. Intermittently having the alternator plugged in causes the same problem. Now I unplug BSD components 1 by 1 clearing each time 2e7c keeps coming back.
All BSD's now unplugged still get 2e7c. All body ground connections are ok. Positive cable recall was done, checked positive connection at jumper location. Anything I'm missing aside from wiring which as far as I can tell is ok.
Any help in this matterv would be greatly appreciated.Thank youWelcome to the forum Jack.Have a question here. You said all BSD's are all unplugged. Can you elaborate exactly what you mean by this? What have you actually unplugged.The reason I ask is because the BSD cable (Bit-Serial Data Interface) system parameters including the the BSD cable consists of:1.
Bit-serial data interface BSD3. IBSI think this is where the problem could possibly be.
The 2e7c is a bit serial data interface signal error. Its plausible it could be a BSD wire failure. I would check these component connections, starting at the battery from the IBS to BSD connector, alternator connector and at the DME plug connections. Thank you for the reply acoste, that was helpful to know, Thank you for your reply H F, components disconnected are IBS,coolant pump, alternator, and oil condition sensor.
DME still plugged in, maybe I should try disconnecting that and see if the code returns, although I don't think I'll have communication then. All connections tight no corrosion. Thanks againAs long as there is a disconnect to any system components, whether you unplugged or there is a break in the actual BSD wire, the code will continue to pop up.
Due to a data interface communication loss between the IBS,alternator to the DME via the BSD cable wire. In other words, the DME is not receiving any information from the bsd and causing the error.In my opinion, if all component connection plugs are ruled good, you most likely have a broken or faulty BSD wire some where down the line, causing a break in the data interface communication to the DME. Thanks again, I found the water pump faulty and replaced. 2e7c does not come back and now have 2 new codes 2e84 coolant pump communication and 2ef5 map thermostat, activation.
Car will still start and stall when water pump plugged in runs fine unplugged. I'm going to start checking harness wiring. I'll let you know if I figure this out.Thermostat and the water pump share a 30A fuse F02 in the engine compartment near the DME.Check the fuse and make sure the water pump is not stuck. It can get stuck when dry. I checked the wiring diagram and on this model there are 2 separate BSD wires.One goes from the DME straight to the water pump. (26th pin on the X60007 connector on the DME.
X60007 is a 26 pin 'natural' color connector, purple wire)The other one connects the DME, alternator, oil level sensor, IBS together.This is why the DME is able to tell that the communication with the water pump has problems. Otherwise this would be a generic BSD communication error.It did throw a generic 2e7c, a bit serial data interface signal error. I had a feeling, there could be a second data wire cause of the 2e84 communication error. Good find on the second BSD wire:thumbup: You confirmed what I was thinking. These two bsd wire errors must some how have a correlation with each other. Tested every fuse including the 5 in the e box and other 2 in DME case.Load tested purple wire from pump to DME okPower at water pump and thermostat.Put all back together.
2e7c Bit Serial Data Interface Signal
All communication faults gone now left with 2e8e IBS and 2f0d Radiator shutter.I'm thinking I lost the other codes for now because the IBS is now offline.load tested grey IBS wire from DME to IBS connector okNew battery and registeredGuess I'm replacing the IBS. Then I can get the snow ball rolling again.Check the IBS cable positive terminal wire, its possible its not getting any power.I have my doubts that if you're not experiencing any of the common IBS symptoms. Like battery discharging, sleeping and wake up, that the IBS is faulty. So I think it will be interesting if the error will clear installing a new IBS, even though the tell tails of a faulty IBS are missing.I would confirm first before committing to a new IBS that,The car enters sleep mode and The car receives a terminal 15 wake /up signal and starts.There are certain characteristic symptoms of a failing Intelligent Battery Sensor which are:1- Battery drain2- 15 wake up signal fault3- If the IBS is shorted to ground, a DME fault code will display 'Voltage Fault DME ON'.
TheIBS will be unable to wake up the DME.4- If the IBS is shorted to B+, a DME fault code will display 'Voltage fault, DME not ON' andno charging current. The vehicle will not enter sleep mode.So usually thats what goes on whit a bad IBS cable. But, hope the error clears with anew ibs. Keep us posted. I know this thread is old, but just to let you know what happened to me: 2e7c bsd generic error, oil level not working, IBS not working.
Alternator was charging only 13.1v and battery died after a day. Unplugged BSD lien from alternator, now oil level works and i can see IBS data in INPA. Going to replace the regulator with a new one and see the result.Some of the things connected to BSD line can confuse the DME if they break, so all things will shutdown or working very strange (like water pump running for a long time).
Now after i disconnected BSD from alternator i get a specific 2e98 generator communication error, but when i plug it in it breaks all the components communication on this network.LATER EDIT: as an additional sign that regulator is fatigued, when you pull out the BSD cable from the alternator, it should start charging 14.2 as its designed for that voltage. This did not happen for me, only 12.9/13 volts on idle and max 13.4 when revving it hard. Actually where i am now i did not find any aftermarket regulator so i ended up buying BMW regulator for $150. (which is a BOSCH, by the way). It'll arrive tomorrow and with a bit of luck i will reinstall the alternator as on this operation i also changed the pulley next to alternator and accessory belt.
Will post the results after i finish. Removing the alternator was really easy, just unbolt the 4 bolts (on 530i, anyway) and it will go down along with the belt.
I reckon that i will have a little work to do on putting it back as i don't have a socket to release the tension pulley.Problem is weather isn't helping (40+ celsius.). Ok so i am backchanged the regulator, installed, everything ok, 14.5v charging, dropping to 13.9v. Went again after 4 hours, surprise: 12.6, maximum 13.1 while revving the engine. Again, oil level fault on idrive. I disconnect bsd line from alternator, still the same charge (no charge, maxim 13.1v) and still error on oil level.I disconnect IBS, oil level starts working, i connect the bsd line to alternator, still the same 12.7-13.1oil level working, after some time, it stopped working even without IBS and alternator BSD line.
I am assuming the water pump needs to be replaced, also on LCI, i don't think that removing the BSD line from alternator will output 14+v but maxium 13.2v, that means that i changed the regulator for nothing. Either way, it's above 12.8 at idle and 13.2 when revving, so this means alternator is not faulty as i measured the diode block before installing the regulator which is new, Bosch, also the rotor contacts were fine.Now i get 27ec with alternator and ibs disconnected, no specific error about not seeing the alternator or ibs or both. It's general communication error which probably means that either water pump or oil level sensor are faulty.
Bit Serial Data Interface Bmw 3 2
I don't know where the connector is on upper cables for the water pump to eliminate the issue completely, someone can help? Car is 530i LCI with N52 engine. Ok, car came out from the indy, everything is fine.- 27EC code was generated by the water pump, although it was working, probably at 100% all the time because of lack communication with DME. Started to throw this code after 10 minutes of idle at 41+ celsius degrees outside, so basically when the water pump started to flow coolant. Changed water pump and thermostat, no code.- battery discharge was caused by faulty starter!!!, even after the guys changed water pump, the car wouldn't crank and battery was below 11volts.- installed new Bosch starter, car works like a charm again.