Key and locks not communicating

[magno_grail]

The on-off-remote button does not sync a '98 or '99 by experience. The reference to the 987 difference comes from searching the internet which, as you can tell, has a lot of bovine excrescence on it.
Not a very advanced system if a key becomes out of sync because it is not used for a while.
I have the Bentley manual for wiring and simple repairs. I went through all the immobilizer wiring when it went belly up from water ingestion.
From experience, if you change out the EEPROM from the old immobilizer to the new one you do not need to have a "dealer" program it.
Maybe sometime when I have nothing to do I will put a logic analyzer on the EEPROM and see what is being read from it. I presume when a key is inserted, the FPGA reads the list of stored RFID keys and compares them to the signal from the ignition switch. Then all I have to do is read the code from the non-working key and program it into the EEPROM list.
Same with the immobilizer/DME. They claim the immobilizer can only be programmed once but the name EEPROM says it can be programmed many times. The FPGA programming is what keeps it from being reprogrammed. The immobilizer checks the code programmed into the DME with what is in the EEPROM.
The immobilizer controls all the security but the radio remote and RFID pill are separate inputs. You do not need a remote to start the engine but you do need the RFID pill. The pill will not unlock the car but the mechanical key will.
If someone is going to steal a car they will just put it on a trailer. More typically it is smash and grab.
I find the annoyances of a remote outweigh the advantages.