BSD Faults

24V E30 · 01-07-2013, 01:01 PM

Hi all New here but not to BMW.

I need some help with a customers 05 330ci ZHP. Ive been pulling my hair for a while on this one
Getting fault codes:
281C Bit Serial Data Signal
281D Bit Serial Data Generator Signal.

Changed 3 diffrent alternators 2 Bosch Reman and 1 Bosch New.
New starter.
New DME.
Checked wiring from Alt to DME, OK.
Grounds are good and clean.
Power wire from Batt all the way to starter/Alt Ok.

The vehicle charges under 12.5V with connector X6524 plugged into Alternator. If i unplug that connector it takes about 2min and then the Alternator starts charging 14V. Charging is the same Voltage at Battery, Boost point under hood, and directly at the alternator.

I'm starting to think the problem is elsewhere in the vehicle i just dont know where to start. Does anyone have some ideas or been down this road before and can help me out please.

Car came in as a No start which was the Fuel pump so that was changed along with a new fuel filter. Once running we found it was miss firing badly, checked the coils and they are all burned from arching. Installed new coils and the car runs good now except for the vanos needing a rebuild which will happen as soon as the kit arrives. Other then what i have mentioned the car starts fine runs good, I'm running out of patients with this stupid BSD fault and need some other ideas, Help me out here guys Please.

mwt330i · 01-07-2013, 03:16 PM

No chance that's an old code stored?

24V E30 · 01-07-2013, 05:37 PM

No it cannot be cleared from the DME.

Also when i have my autologic connected and am in the DME, If i start the engine i get disconnected from the DME and cannot re-connect untill the engine is turned off. It does not do this with any other control unit. I can access everything with the Engine running except for the DME. This is why i have a feeling the problem is somewhere else within the vehicle electrical system.

01-07-2013, 01:01 PM	#1
24V E30 Registered User Join Date: Jan 2013 Location: Calgary, Ab Posts: 2 My Ride: E30 View My Garage	BSD Faults Hi all New here but not to BMW. I need some help with a customers 05 330ci ZHP. Ive been pulling my hair for a while on this one Getting fault codes: 281C Bit Serial Data Signal 281D Bit Serial Data Generator Signal. Changed 3 diffrent alternators 2 Bosch Reman and 1 Bosch New. New starter. New DME. Checked wiring from Alt to DME, OK. Grounds are good and clean. Power wire from Batt all the way to starter/Alt Ok. The vehicle charges under 12.5V with connector X6524 plugged into Alternator. If i unplug that connector it takes about 2min and then the Alternator starts charging 14V. Charging is the same Voltage at Battery, Boost point under hood, and directly at the alternator. I'm starting to think the problem is elsewhere in the vehicle i just dont know where to start. Does anyone have some ideas or been down this road before and can help me out please. Car came in as a No start which was the Fuel pump so that was changed along with a new fuel filter. Once running we found it was miss firing badly, checked the coils and they are all burned from arching. Installed new coils and the car runs good now except for the vanos needing a rebuild which will happen as soon as the kit arrives. Other then what i have mentioned the car starts fine runs good, I'm running out of patients with this stupid BSD fault and need some other ideas, Help me out here guys Please. Last edited by 24V E30; 01-07-2013 at 01:29 PM.

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01-07-2013, 03:16 PM	#2
mwt330i Registered User Join Date: Nov 2011 Location: Western MA Posts: 37 My Ride: 2004 330i 6speed View My Garage	No chance that's an old code stored?

01-07-2013, 05:37 PM	#3
24V E30 Registered User Join Date: Jan 2013 Location: Calgary, Ab Posts: 2 My Ride: E30 View My Garage	No it cannot be cleared from the DME. Also when i have my autologic connected and am in the DME, If i start the engine i get disconnected from the DME and cannot re-connect untill the engine is turned off. It does not do this with any other control unit. I can access everything with the Engine running except for the DME. This is why i have a feeling the problem is somewhere else within the vehicle electrical system.