Hi guys workin on my bro's 2006 R50 cooper his airbag light is on and will not reset ive checked the seat wiring all looks good,i also replaced the airbag ECU still getting error codes via INPA and the light wont reset anyone make any sense outa these codes

E R R O R M E M O R Y R E P O R T -------------------------------------
Date: 08/15/14 14:44:35 ECU: MRS4 JobStatus: OKAY Variant: MRS4-------------------------------------------------------------
RESULT: 5 errors in error memory !-------------------------------------------------------------

132 MRSA front right
Error frequency : 1
Error currently present Wrong Algo parameter Error not sporadic-------------------------------------------------------------

129 MRSA front left
Error frequency : 1
Error currently present Wrong Algo parameter Error not sporadic-------------------------------------------------------------
2 Ignition circuit ZK1 / Belt tensioner Driver
Error frequency : 1
Error currently present Resistance too large Error not sporadic-------------------------------------------------------------

132 MRSA front right
Error frequency : 2
Error currently present Type error Sporadic error-------------------------------------------------------------

129 MRSA front left
Error frequency : 2
Error currently present Type error Sporadic error ================================================== ===========

 

Eroor codes says it all...
Looks like a bad seatbelt tensioner.... And (maybe) a wiring issue...but if you plugged and unplugged stuff to check it, YOU might have caused those....

 

thx for the reply Zip got it sorted man had to replace the seatbelt pretensioner and clear the codes in INPA

 

I'm getting same one in my mini, just showed up. How do I fix? Thanks

 

What is seat belt pre tensioner? Is this electronic?

 

Since you haven't provided the year and model - I don't know if this maybe of any help to you, but...
I lived with the airbag light on for almost 7 years on my pre-facelift '04 R53.
My issue was not due to a faulty seat belt pre-tensioner (although yours may very well be), so I have no experience with the pre tensioners.
I don't remember the exact fault code - but in my case; it was due to a blown Battery Safety Terminal squib. Even though the car had never been in a collision.
I eventually discovered this discussion here on NAM: Battery cable squib resistance. alistairr24 shows the fix in post #19 . I followed their advice and preformed the simple repair which resolved and extinguished my seeminglyinexorable airbag light.
And yes; (from my reading/understanding), your airbag will still deploy and the battery will safely disconnect in the vent of a collision.

The aforementioned may also be something to look into if the seat belt pre tensioner turns out not to be the problem.
Good luck and hope you'll let us know how it turn out.

 

It's a 2004 R53 (I think that's the right R number).

I wouldn't think tensioner would be electric at all, just mechanical thing.

That's interesting I'll check that out.

Maybe I wasn't clear, I'm getting the following code:
132 MRSA front right

I used Bavarian Technic to pull this

 

You didn't change out the seats or disconnect any of the plugs under the seats without disconnecting the battery first? Let's just get that ruled out right away.

 

Seatbelt PRE-tensioner is indeed an electrical device that fires a tensioning device in the event of an accident to take up the slack in the belt.

 

No I didn't do anything, the light just decided to come on few weeks ago.

Ohhh interesting, it's probably that then? I'm not sure I care lol but was wondering. I may replace it if feel like. How much? Or can I defeat it

Every car since forever has mechanical device for this, lol. Crazy Germans

 

Where is this device located? Is it up on the wall or somehow in the latch assembly down low? I see people on ebay calling this the seatbelt pre tensioner

 

Something like this? I don't see an electrical connector..

https://www.ebay.com/itm/32569216590...3ABFBM1MuOtati

 

This is what I see being called tensioner or pre tensioner is the buckle assembly. But how could that tension anything? The belt goes through the handle like any car I don't see any fancy way of it tightening. And these do have one or two electrical connectors

https://www.minimania.com/part/NMI77...m-Gen1-R50-r53

 

The image on the minimania site is correct.
The Bentley manual describes it as the "pyrotechnic tensioner and seat belt buckle assembly".
But you (probably) already know this by now.
There is a synopses of how it functions: "Front seat belt buckle, removing and installing" on the page below.

 

Interesting, no this is very helpful I appreciate it. I wonder if it's just looking for a resistance I bet I can add a resistor to make the stupid light go away. I looked under the seat all the plugs etc look in tact but I'll do some more investigating and see what I find. I guess no one knows a value it should read?

I guess the crazy thing "contracts" or shortens in length between buckle and the mounting bolt. Only way it can work. In conjunction with belt mechanical tensioner up top it would tighten you down in accident. I've never heard of these.

 

I did some testing, results/comments below:

1. I put 2.2, 2.2+1=3.2 ohm resister on the blue plug under passenger seat. Tried resetting codes, code came back.
2. I unplugged all plugs (black, yellow, blue) on drivers seat and passenger trying to get more codes to come up, none came up even with key cycle.
3. Measured ohms on blue plug, it's shorted together meaning it would have to connect through ground to do anything useful. If you look at the seatbelt plug side itself it's physically shorted together in the plug. I'd assume, if this is the firing circuit, it fires from 2 wires (redundant) to ground mounting point through the device.
4. I suspected the blue plug because it says "Nobel Dynamit" (yes no e?) on it. This maybe signifies the explosive charge? Who knows
5. I looked over the battery connections as suggested but I see no reason it can be that. I can't believe they have explosive severing charge on that too. Explosives all over this crazy car! I guess that fits me since I do have a Federal Explosive License
6. When I attempt a reset the airbag light goes off briefly and returns
7. Does Module self checks take some period of time after key cycle? I didn't wait long. On every other car thing like this the checks are nearly instant in milliseconds, so you don't have to "wait" for it to run a routine.

At this point I'm not convinced the airbag module is working correctly. OR, I'm using Bavarion Technic reader and it isn't reading properly somehow, but more codes should appear with plugs unplugged. I could try reading it with the OEM software like ISTA-D, etc but I don't expect a different result.

Any ideas? I'm an electrical engineer and a field engineer at that, I know how wires and connections work, lol. I've worked on cars all my life. For now, the Germans have defeated me I'm stumped

If any ideas I'd appreciate, thanks.

 

No ideas anyone? I can't seem to find much info. I've noticed there is a lot more info from BMW enthusiasts and some of it overlaps, but it's hard to find info on mini self repair. I still plan to hook up ISTA D and see what I find. But why wasn't I finding new faults?

 

From what I'm reading on BMW forums it isn't the seatbelt. If I unplug the blue plug another error comes up. Something hosed up with all these errors. The Bentley manual doesn't list internal module error codes. I don't know how the factory figures this stuff out but I suspect its an impact sensor now

https://www.mini2.com/threads/airbag...-reset.362276/

https://www.bimmerfest.com/threads/i...tance.1389691/

 

I did try INPA and it works much better at communicating with the module in general, and results in German lol

 

Started new thread here:

https://www.northamericanmotoring.co...ct-sensor.html

 

Well guys, found the issue. Mechanical wire damage or mouse? Not sure. But pretty sure this is it. Thanks for help and hope this helps someone. There are two sensors in this location, one each side.