Replaced Water Pump,
Join Date: Aug 2009
Location: New Zealand
Fixed my airbag warning light after a bit of research and detective work. After failing a Warrant of Fitness test (WOF, NZ's version of the UK's MOT) for a dud main airbag warning light I removed the warning light pod to find a previous owner had cut the LED off the cicuit board. We had a few spare LEDs at work, so I resoldered one in (I put in a yellow one to later discover it should be red). The light went on, went off, came back on and stayed on.
I tried to connect to the Airbag ECU using both KWP71 and FiatECUScan, but go no further than being able to connect. I had modified my cable with an switch enabling me to select either pin 3 of 7 for airbag or engine ECU. After researching here on AO and on other sites, it appeared that the earlier Airbag ECUs used a proprierty, or at least oddball comms protocol, and required Fiat Examiner to clear error codes. As I wanted to be able to clear any future errors I ordered a secondhand one from Auto Lusso asking for the part numbers that superceeded my early unit sourced from ePer. The local 'specialist/wrecker' in Auckland wanted NZ$650 +tax. That converts to about GBP350 all up! Thank god we live in a global market place.
I also needed to work out what had driven a previous owner to cut the LED. The passenger seat has a few unsual small lumps in it and I realised that this was the passenger sensor and that it was damaged, probably by somone cleaning the seat. After a little more online research I found the solution was to fit a resistor in place of the seat sensor. It took a lot more searching to discover the correct value of the resistor which is 2K7 (although anything in the 2K up to 3K range should work). Not 2 Ohms as is stated in many posts, this is so small a resistance that it is impossible for it to be correct.
The replacement ECU arrived from Auto Lusso and I fitted it after disconnecting the battery for 30 minutes. This time the Airbag warning light came on and stayed on. As I had hoped I was able to connect with both KWP71 and FiatECUScan to the later model ECU. However the ECU showed a fatal 01 error. The 'new' ECU was DOA out of the box. Got back in contact with Auto Lusso who sent me another one without question and 'long story short', problem solved. Many thanks to Auto Lusso for great service to a customer halfway around the world.
Darryl in New Zealand
Last edited by KiwiAlfa156; 27-03-11 at 22:00.