Immobilizer, is there a chip in the key/hinge part of fob too?
Just bought a second 4 button keyless remote fob with blank key from carsandremotes.com for my sons 2013 mazda 3. The fob LOOKS like OEM, unlike most of the super cheapies it does have the Mazda logo on the top of the fob by the key "hinge".
Managed to program the fob fine. Yesterday, I got the key cut, the usual locksmith story of "no guarantee unless we provide the key". Sure, OK. The key cut looks identical to the original. It opens the door, and the ignition barrel goes all the way around but will not start the car. The immobilizer icon flashes rapidly on the dash when I try to start the car.
I know it isn't the electronics as I swapped the key/hinge part over to the old fob. Still the old key on the new fob will start the car but the new key on the old fob won't. I also tried just the key/hinge part with the fob left in the house and the old one works fine but the new one does not.
I wonder if there is also an RFID chip or something in the hinge part of the fob? It must either be that or some really subtle difference in the way the key was cut - btw the locksmith claims to have used an expensive laser guided key machine. The new key blank was a few thou thinner than the old one, and maybe 10 thou narrower, plus the ramp at the base of the key maybe is a 1/32 longer. But as I mentioned, the key turns the barrel and opens the doors perfectly.
I think there's a roll pin holding the key into the hinge, so I might try knocking that out and swapping the key shank over to the other hinge and see what happens.
Does anyone know what kicks the immobilizer on?