Hi Andy,

Thanks for the reply. I had already eliminated the wiring at the back of the cluster.
I got a correctly encoded transponder and that didn’t improve matters, so its not a key problem in this case.

Since I posted last I took the engine ecu out with the intention of cheating somewhat (removing the immo) and discovered corrosion on the injector pins. Water damage only on the pins externally, none inside. Since plugging it back in I got a fault code for an injector driver, now repaired by cleaning the pins. There was no such code when I got the car but I know someone else looked at it before me. The eeprom in the ecu that holds the immo data is faulty. I can sort that easily enough but I am not sure that would cause the key coding to fail. Maybe the ecu needs to answer the immo to complete the process. Maybe the driver problem spiked the ecu, or the cluster, or both.

In general I find immo live data a bit ambiguous so I wanted this to be a learning experience. I am kinda surprised there are not more opinions on live data from an old system like this. Either way, the customer needs his car so when the ne eeprom arrives next week it will go out minus its immo function.



cheers

Alan