Member
Dear all,
I've tried it before on a dutch forum, saidly there were no responses what so ever in a week or so
A few months ago my MRS3 airbag module (6577 6900727) got an 240 internal error. A bit of searching on google told me this was irreparable. So i've started to search for the cause and the possible solution. I've quickly found a list of replacement modules:
6577 6910676 (01/01/2001 — 09/26/2001), nonexchangeable retrospectively
6577 6920848 (08/29/2001 — 04/12/2002), Exchangeable retrospectively
6577 6919789 (02/25/2002 — ), Exchangeable retrospectively
I ended up with a 6919789 module from a local scrapyard. This is a MRS4 module with newer firmware. However I'm having a little trouble resulting as a burning airbag light. Inpa states the following codes:
Code:ERGEBNIS: 5 Fehler im Fehlerspeicher ! ------------------------------------------------------------- 80 Versorgungsspannung Fehlerhäufigkeit: 1 Fehler nicht vorhanden Unterspannung Fehler nicht sporadisch ------------------------------------------------------------- 134 MRSA vorne rechts Fehlerhäufigkeit: 1 Fehler nicht vorhanden Programmierung fehlegeschlagen Fehler nicht sporadisch ------------------------------------------------------------- 132 MRSA vorne rechts Fehlerhäufigkeit: 255 Plausibilitaetsfehler Fehler nicht vorhanden Fehler sporadisch ------------------------------------------------------------- 131 MRSA vorne links Fehlerhäufigkeit: 1 Fehler nicht vorhanden Programmierung fehlegeschlagen Fehler nicht sporadisch ------------------------------------------------------------- 129 MRSA vorne links Fehlerhäufigkeit: 255 Plausibilitaetsfehler Fehler nicht vorhanden Fehler sporadisch =============================================================
A little birdie told me the MRSA is the side impact sensor in the doors. Another little birdie also told me that all codes above 100 are mapped as interal ECU error's. Don't know what to believe.
What i've tried to do:
- Reset the error code on inpa. This only works until the next power down.
- NCS Expert, tried a factory reset, didn't work
- Tried to flash the firmware with winkfp, unfortunately this is not possible on these modules
I'm a bit out of ideas how to fix this problem. Could you help me find the solution?
Member
1. Those numbers from INPA are decimal. The MRS4 list of numbers for errors here are HEXADECIMAL (ie base 16). SO the '80' INPA error corresponds to 50 at that location, which is a Power supply error.
2. So, 134 decimal = 84 Hexadecimal ( 8 x 16 + 4 = 134), which is Sensor for side airbag right.
3. The '100' doesn't seem to apply here because of the decimal to hex conversion. Maybe they mean 100? F0 is the only internal ECU error that I see on the list at the link.
If you have a power source error, it may be because of how you did or did not disconnect the battery when doing the work. Just a thought.
Last edited by gmak; 02-22-2016 at 04:01 PM.
gmak: The Good, the Bad, and the Ugly. A journey with my new-to-me 2000 540i
"Working on a BMW E39 is the best way to run out of time."
Member
the power supply error did vanish after the INPA error reset. However the MRSA stayed. What to do about these?
Note: there is an error in your link, altough i did find it through Google.
Member
Yeah. lOoks like the local software doesn't like that forum that's in the link.
gmak: The Good, the Bad, and the Ugly. A journey with my new-to-me 2000 540i
"Working on a BMW E39 is the best way to run out of time."
Member
Last edited by Walopower; 10-29-2016 at 02:34 PM.
Member
I had this recently. Replaced both MRS sensors (under the carpet beneath the front seats) with the MRSA4 side impact sensors, part number 65776910678, and recoded to standard MRS4 using NCSExpert, then cleared all airbag errors using INPA. Now I don't have the dreaded 6900727 MRS3 control unit, and I do have a working MRS4 system. Easier and cheaper than having the original error 240 reset, and a better long term fix IMHO. Over here in Europe the newer ECUs and sensors are available easily and cheaply secondhand.
Member
That is true.
MRSZ3 corruption is problem that you don't want again!
Last edited by Walopower; 10-30-2016 at 02:12 PM.
Member
Might be unrelated but 134 base 10=86 in hex
1000 0110 =134
8 6
1000 0100 =132
8 4
Member
I've had a couple of PMs about this recently, presumably as the E39 gets older and the fault becomes more common. So thought it might help to give a more detailed reply for what I did:
Yes, it was as simple as changing the module and side impact sensors - the module below the centre console is easy enough to change out once you've worked out how the release clip goes, then peel back the carpet in front of the front seats (you don't have to remove them, just push them all the way back to give you space) to reveal the side impact sensors. Once you've changed out both parts then the only need for NCSExpert is to code the correct airbag settings for your car ie my module came out of a car with rear airbags that my car doesn't have so I had to change that. Then INPA or similar to turn off the airbag light since the module change will have triggered an error.
With that done the car will now recognise the system as a MRSZ4 system throughout, no further changes needed. A year or so later and I've had no issues with the system since changing. I got the parts from eBay: at the time the replacement module was about £10 and the sensors about the same each, so overall cheaper than sending my faulty module off for reprogramming.
Member
Perfect and Thanks for this hint. I had the same problems with MRS3 and since I have read this thread I switched to a MRS4 setup. Worked like a charm 👌😁Originally Posted by madlandrover
Having No Trouble Here
BMW CCA Member
This is a good tip, I'd not seen it before. Especially as seems the MRS4's seem to not be as problematic as the 3's? I don't relish changing the side impact sensors of course but its nice to know its an option... famously most of the MRS3's on eBay are already 'bad' even if the seller may or may not know it.
2003 M3CicM6 TiAg
2002 540iT Sport Vortech S/C 6MT LSD TiAg
2008 Audi A3 2.0T DSG (the daily beater)
2014 BMW X1 xDrive28i (wifemobile)
Former:
1985 MB Euro graymarket 300SL
1995.5 Audi S6 Avant (utility/winter billetturbobattlewagen)
Member
It's certainly so far so good for me. In practice the side impact sensor change is a matter of minutes - 4 bolts on the seat rail, tip the seat back, peel the carpet back, change the sensor, replace all above. Then NCS time...
Member
has it been tried just replacing the evil 0727 MRS3 with MRS4 and not changing the side impact sensors?
thanks
Member
Yes - the older sensors aren't compatible with the later ECU, so throw up a fault.
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