in the second image it shows the snap-on 'talking' to the SRS ecu which is why i assumed it wasn't knackered.
Canbus is something i have zero knowledge on so im flying blind on this one.
it says
'failure warning lamp status (from can)' No Error which leads me to believe the can side of things is ok. I was stumped on how it can talk to it but then not do the alignment.
when i try to proxy align i follow the process on the screen and at the end it says its completed, but then i still have the proxy fault when scanned.
https://crashdatauk.co.uk/fiat-citroen-peugeot/b0100-repair/ this is the service i think i need from crash data.
https://coastalmotorhomes.co.uk/fia...en-relay-air-bag-ecu-module-2006-2014-oe.html this is the replacement from coastal
The trouble with these aftermarket and rather generic scan tools is that it's difficult to be sure what exactly they mean, and thus what is going on.
When the tool suggests Proxi Align, presumably the SRS ECU must either be not recognised on the network, or being recognised as a different unit to the one programmed into the vehicle, because they are the reasons that a proxi-alignment would be required.
Basically, the system on the vehicle is like a computer network, with several ECUs controlling various components or systems, that need to be able to communicate with each other to receive instructions or pass them onwards to other units (nodes). The addresses and identification of all the units are stored in a master proxi file in the BCM, with copies distributed to several other nodes. A proxi alignment scans the system for the nodes (ECUs) that are present, identifies them and writes a new proxi file in the BCM, copying it to the other nodes on the network that also hold copies. The purpose of the copies is to reduce wait times and bottlenecks in communication between different nodes that could happen if the network was busy and all communications had to be directed through a single point (the BCM).
But anyway, with Fiat specific tools such as
MES and AlfaOBD it is much easier to see what is going on, as they will display the status of the network and all the configured nodes, and report any that are present but not properly configured, or faulty.
I'm guessing that your scan tool is indicating a proxi alignment because it can see that the SRS ECU is present, but is either unable to identify it, or fully communicate with it. If you can get access to someone with a copy of
MES, it might well show a better indication of what is wrong, together with a full Fiat specific fault code.
It looks as though you are unlucky also in that the Euro 4 SRS ECU is a lat more expensive than the one I needed (Euro 5/6 2014 on) which Coastal have at £205.
When I looked a while back, the headline cost for the common SRS ECU repairs by Crash Data and the like was cheaper than a new unit, but they had started charging extra for some repairs and the overall cost including postage came in at almost the same or more than a new unit for me, but probably less than the new cost of a replacement for you by the looks of it.
I think in your situation what I would do is contact one of the repairers and see what they suggest. I would only add a caution regarding Crash Data. There are two companies advertising ECU repairs for the Ducato SRS ECU, both using the same name (unless it is the same company with two different websites). But on motorhome forums there are more than a few comments about poor service from Crash Data, with repaired units going faulty again soon after being refitted and the company washing their hands of them. Another similar company called Northern Autotech seem to get better reviews.
I must stress that I have not had any personal interaction with either/any of those companies however. That is just what I picked up from numerous forum posts over time.
