Hi all.

This is the first time I've used this site, and I hope someone can help.

I have a 2009 Fabia. Recently the airbag warning light came on. I bought an ICarsoft i908 to try to read the problem and reset the light. The scanner gets power but cannot communicate. I've read that pin7 is the KLine and should have about 4v. In mine, pin16 shows 12v, pin 4 and 5 are earthed, and pin7 shows 10.7v. This is without the ignition on. When I start the engine, pin7 then shows 12.2v.

The car is as bought, with no modifications. About a year ago, there was a problem with the alarm activating at random, but that stopped after a few days and has been fine since (I fixed that by removing the fuse; the immobilizer still worked, but the alarm would not sound). The recent airbag light is the first indicator light to warn of a problem. As far as I know, the diagnostic socket has never been used.

Hang on; it's just occurred to me; I only recently replaced the alarm fuse, as part of trying to diagnose a problem with the ignition key failing to turn, which turned out to just need some wd40. The airbag warning light may have come on since then. I'll go and try removing the alarm fuse again, to see if this affects the Kline voltage, and will update with any results. In the meantime, any ideas on the Kline voltage would be appreciated.

 

Update. I tried removing fuse 54, as before, and the Kline voltage is still as above.

Update.

I'm sorry for my stupidity. I was basing my knowledge on a Youtube video, which stated the K-line signal voltage should be about 4v. But on the following site

https://learn.sparkfun.com/tutorials/getting-started-with-obd-ii

I've now realized that the Fabia uses ISO 14230 KWP2000 protocol, which means the signal voltage should be about 12v! It appears there may be no problem with the port, but perhaps I've been sent a faulty iCarsoft device?

Bit late here< I know but I would avoid using WD40 on the ignition switch. It might attract more grit/dirt in the long term and cause it to stick again. It is far better to use graphite spray, which is now hard to get, or graphite from a puffer bottle, which is far easier to obtain. Much better at sticky locks etc and don't try using a solvent or oil on the boot pop button without first checking with the main dealer. I did and within days, the popper failed. The dealer told me it is very sensitive to such cleaners/lubes and I had to fork out for a new boot catch. (Cheaper from a dealer new, then most breakers want, used and most likely half- fudged).