Bmw E39 M5 Airbag issue

[torbla]

Hello,

I have a issue with my airbag warning light, INPA says it's the right and left mrsa sensors under the seats, codes 132 and 129.
Have replaced them with new ones but it does not help, it was the same sensors(green). I do not have the bmw part number, only the suppliers number but if was found using bmwfans.info. Believe it is MRS v4
After clearing the errors they are back the next time I start the car. Will it help replacing the ecu to a newer version, MRS4. Not sure what ecu i currently have or the version of sensors, but I will check that later today.

I noticed the mrsa sensors have 3 contact pins but the cable only have 2 leads, might this be the issue? Have had some trouble finding the correct wiring diagram.

All tips will be greatly appreciated


Erik

[torbla]

My ecu part number is 65776910676(MRSZ4), the impact sensors I replaced had identical numbers with the new ones so I did not bother with removing the seat. They have the part number 65776900728(MRSA3).
Hopefully it will help with new impact sensors, I have ordered 2x65776910678. Clearly marked as MRSA4