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> TRW2 Airbag ECU Teardown
buellboy
post 3rd February 2011 12:02
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Following on from the thread on engine diagnostics http://forum.alfa145.com/index.php?showtopic=18638 it seems that TRW2 Airbag ECU's are not re-settable by any program available (don't know about Fiat Examiner).

SO next step seems to point to a low-level chip hacking.

I've just opened one up and there is some very funky electronics in there (pics coming v.soon). There are 3 1800uF 35V capacitors, a robust looking mosfet, a funky looking TRW marked white component the likes of which i've never seen before, a motorola SC432559CFU3 chip, a couple of op-amps AND interestingly a Cherry Electronics CS8120.

Downloading the CS8120 spec sheet ( http://pdf1.alldatasheet.com/datasheet-pdf...RRY/CS8120.html ), it seems that it is circuitry that can hold a pin high/low...with a reset function.

I don't know enough about electronics to understand it all, however I'm more than willing to donate my ECU for experimental reasons so as to put this problem FINALLY to sleep!

This post has been edited by buellboy: 3rd February 2011 12:28


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GialloEvo94
post 3rd February 2011 12:59
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QUOTE(buellboy @ 3rd February 2011 12:02) *
Following on from the thread on engine diagnostics http://forum.alfa145.com/index.php?showtopic=18638 it seems that TRW2 Airbag ECU's are not re-settable by any program available (don't know about Fiat Examiner).

Apparently Fiat Examiner can diagnose and reset TRW2 airbag ECU's so if all else fails then a trip to the stealers should see it sorted but it's frustrating having to pay out 40-50 for the privilege.


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buellboy
post 3rd February 2011 13:02
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QUOTE(GialloEvo94 @ 3rd February 2011 12:59) *
Apparently Fiat Examiner can diagnose and reset TRW2 airbag ECU's so if all else fails then a trip to the stealers should see it sorted but it's frustrating having to pay out 40-50 for the privilege.

Feck that! LOL No community spirit either! IF we can figure out how to sort it, then it'll be another alfa145 triumph!


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GialloEvo94
post 3rd February 2011 13:25
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Looks like you don't need any software or teardown of the airbag ECU components to reset it. See the post I just added to the other thread HERE.


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buellboy
post 3rd February 2011 17:37
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Just FIY and since I had already opened the box up:





More here:

http://s341.photobucket.com/albums/o393/g3...20Airbag%20ECU/


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buellboy
post 15th May 2012 15:36
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MASSIVE MASSIVE NEWS----------

A new piece of software with the ability to reset TRW2 Ecus has been released! Take a look at
http://peter-feil.eu/mediawiki/index.php/Trw2scan



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GialloEvo94
post 15th May 2012 18:03
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QUOTE(buellboy @ 15th May 2012 16:36) *
MASSIVE MASSIVE NEWS----------

A new piece of software with the ability to reset TRW2 Ecus has been released! Take a look at
http://peter-feil.eu/mediawiki/index.php/Trw2scan

Nice find thumbsup.gif

There was a tool for the TRW2 mentioned on the Unidiag forums a while back but it was for Linux only and not publicly released (you had to email the guy for a copy - I got no response unfortunately). This one looks like Windows and Mac OSX executables. I'm on my phone at the moment so can't run it up right now. Have you managed to test it out on your TRW2 ECU yet?


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buellboy
post 15th May 2012 19:44
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Not yet as i've literally just got back from work now and i have 2 obstacles:
1. My brother has the car
2. My gf smashed the laptop's screen

So I gotta hope that the laptop's screen has arrived and that i can fit it. Then i have to co-ordinate with my brother....cut a long story short., i will probably only get a howto at the weekend!


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GialloEvo94
post 15th May 2012 20:36
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Let us know how you get on. It sounds very promising and I'm sure it will work just fine biggrin.gif

I've now added this to the list of software in the main DIY ECU Diagnostics thread.


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buellboy
post 15th May 2012 21:49
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just tried and had no luck....driver issues. Had to be forced to sign up to unidiag group to get the correct drivers....of course i still need to be approved for the group! rant.gif rant.gif rant.gif rant.gif


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GialloEvo94
post 15th May 2012 22:09
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QUOTE(buellboy @ 15th May 2012 22:49) *
just tried and had no luck....driver issues. Had to be forced to sign up to unidiag group to get the correct drivers....of course i still need to be approved for the group! rant.gif rant.gif rant.gif rant.gif

What drivers?

I ran it up on my PC and all I needed to install was the standard FTDI drivers which you just download from the FTDI website. Then I plugged my diag cable in and fired up Trw2scan. Obviously I had no ECU connected to the other end of the cable so the software complained it couldn't connect to an ECU but it did try a number of times before giving me an option to abort retrying.


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buellboy
post 15th May 2012 22:13
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i've just done that precisely before you posted! The trouble is that I was outside and cold and trying to make the drivers that came with my cable work. Only just about 5 mins ago i figured to try the ftdi drivers!


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GialloEvo94
post 15th May 2012 22:17
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QUOTE(buellboy @ 15th May 2012 23:13) *
i've just done that precisely before you posted! The trouble is that I was outside and cold and trying to make the drivers that came with my cable work. Only just about 5 mins ago i figured to try the ftdi drivers!

Cool smile.gif On the downside, now you're going to keep getting a load of spam from the Unidiag group like I do for posts you've not even subscribed to!! laugh.gif


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buellboy
post 15th May 2012 22:23
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QUOTE(GialloEvo94 @ 15th May 2012 22:17) *
Cool smile.gif On the downside, now you're going to keep getting a load of spam from the Unidiag group like I do for posts you've not even subscribed to!! laugh.gif

Well luckily i remembered my password eventually...the one i did about 2 years ago to join unidiag and then never used again! Luckily the reset questions were very easyt.....first love and first motorbike...so basically the same answer for both!
Managed to FINALLY get a response from Yani @ FES regarding the TRW2 rest being made available to FES users....he was under the impression that you may need a squib to avoid the airbag exploding...

I guess it is always good as a word of warning (if you don't know already) that these things are explosive and dangerous ,so best to do any resetting whilst sitting outside of the car!


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GialloEvo94
post 15th May 2012 23:31
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QUOTE(buellboy @ 15th May 2012 23:23) *
Managed to FINALLY get a response from Yani @ FES regarding the TRW2 rest being made available to FES users....he was under the impression that you may need a squib to avoid the airbag exploding...

I'm not really sure what he means by that. The squib is the thing inside the airbag cannistor that tiggers the deployment so not sure why you would need another one as all the airbags already have them unsure.gif I can't see why reading and resetting the codes on a TRW2 airbag ECU would be any different than on a TRW M.Y.97 or M.Y.99 airbag ECU which FES already supports. With the M.Y.97 and M.Y.99 airbag ECUs, you have to issue a specific command containing a "login password" to the airbag ECU before you can then issue a further specific command to fire one of the airbag squibs, so it's not something you can do by accident and you need to know what the password is. For safety reasons, I can't believe that the TRW2 airbag ECU would work any differently.

It sounds more likely to me that he just isn't able to find any protocol documentation for the TRW2 airbag ECU in order to add support for it to FES.


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GialloEvo94
post 1st July 2015 06:29
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Just to add an update to this thread, Multiecuscan had the functionality added to reset the TRW2 airbacg ECUs in v2.0 of the software so there is now an easy / user-friendly option available for doing an airbag reset on these TRW2 airbag ECUs. That option is however only available on the paid-for version of Multiecuscan. I have now updated the main ECU Diagnostic DIY guide thread HERE to include this information.


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