Any idea on what if anything I could be doing wrong when I try and sync the key?
The fob used to work, when the LED didn't light anymore on the key, I changed it about 4 weeks later, now the LED works again when pressing any button on the fob, even holding the lock button down, the LED stays lit as though it is shutting windows and roof so I am assuming the FOB is working. Can I do some sort of test to assertain the fob is working?
The fob is faulty
The fob never worked
You are not correctly syncing
The Alarm ECU is faulty (very rare)
My guess would be one of the top 2

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