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325_driver

My new e46 project

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Signing off for the day. Wanted to get some of it sealed off before I leave it over night.l. Looking pretty darn straight. It's the second half of the the panel that needs some work.

 

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Looking a hell of alot better

Can see a few tiny grooves with the primer on.

Not long to sign off on this side

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Edited by 325_driver
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While the weather's been crap, and the OBD is now reading the car, I thought i would dig into the final warning light on the dash, the ABS

Thought this might be a helpful write up if anyone else comes across this problem, because I would say wiring / connection issues are probably more common than the actual pre-tensioner failing.

** Edit **

I'm writing this because I don't want anyone else reading this to get the wrong idea or bad information, as I am aware pretensioners and air bags have pyro charges in them.

If you're planning on doing your own testing, seek advice from an electrician about this and follow correct procedures before commencing.

The battery had been disconnected for atleast 15 minutes prior to me unplugging or inspecting any harnesses / plugs.

The pretensioner was removed from the seat and placed in a vice when I tested for ohms.

To measure resistance of the pre-tensioner the short tabs need to be dis-engaged, i'm aware why these are there, to prevent the device accidentally being set off outside of it's intended purpose in a crash. 

I am aware that a multi meter sends a small amount of current in order to measure resistance, from what I've always been told on a 200 ohm scale a maximum of 3 volts will be used, which I am told is not enough to set off a pyro charge but seek your own advice on this.

I am also aware that static electricity carries enough voltage to set off a pyro charge

The purpose in why I posted this up in the first place was more to show where the failure for me occurred, as I couldn't find much about it specifically online about "Low resistance" fault, and the small adjustment I made to ensure the shorts are dis engaged when plugged in, doesn't compromise the safety circuit of the pre-tensioner, when the plug comes out, the shorts engage again anyway.

** Edit **

So the 2 codes it pull was 

- resistance too high passenger, I pulled the pre tensioner plug out, cleaned it put it back in, and that code went away

- resistance too low driver side, pulled the plug out cleaned it, put it back in and code persisted.

From my research that code of low resistance is usually a sign of either a failed pre-tensioner, or one that has been deployed.

Found a spare one with wiring at pickapart for $12, so swapped both tensioners onto both sets of wiring, no avail

Took the driver seat out again, measured the ohms on the pre-tensioner, seemed to be Ok about between 1-2 ohm ish (not sure my leads on the multimeter are still 100% accurate anymore)

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Plugged it in, and measured from the larger plug, you have to dis-engage the metal tab from the pin in there too, which is a pain, And measured 0 ohm.

So still suggesting a short circuit some where.

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Cut the wiring insulation from the main plug to look for a break in the connection, found nothing.

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So thought that's strange, which left me with something at the plug in the pre-tensioner end

I thought maybe when it was plugged in, the tabs weren't disengaging from the pins, thus creating a 0 ohm curcuit,

tried adjusting the tabs a bit so it would push back easier with the plug engaged to no avail,

so I adjusted the end of the plug by adding a tiny bit of a lip to push back those tabs when I inserted it

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Measured it from the larger connector and sure enough, showing correct ohms again

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Installed tensioner back on the seat, plugged it back in, then connected the battery.

Loaded up ISTA, reset the Errors, and warning light finally gone!

Hope this helps, wrote it up because I was struggling to find a description of this specific issue, about the plug not disengaging the metal tabs (that act as a fail safe) when performing service work

Onto more body work tomorrow, got to get rid of some final low spots.

Edited by 325_driver
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So you were testing for ohms back into the pre-tensioner after disengaging the safety shorting bar.  The pre-tensioner didn't go off?  You were lucky. 

I have heard of others who have had the pre-tensioner or airbag go off in front of them when doing this sort of testing.  The 9V battery in the multi-meter can have sufficient energy to set them off.  BMW have put the safety shorting bars there for a reason.

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@NZ00Z3 

** EDIT ** 

For the sake of safety I have updated my original post on it, I don't want people getting the wrong idea about what I was posting up, since I am talking about components of the SRS system.

Edited by 325_driver

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11 hours ago, zero said:

No mixing

I think I might actually get some, over the years mixing up a small amount of filler has really started to get to me for the tiny bits.

Been meaning to get some but keep forgetting every time I order panel and prep stuff haha.

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