A question concerning the car remotes; door lock, headlights, etc.Well, they have a chip that is programmed at the factory, probably with a sequentially-incremented number. The car is then trained to accept several key's serial numbers. The all-in-one keys/fobs have two chips, one operated
Each car/handset must be a matched pair, regarding the ID
and security codes. Obviously only one car in the parking
lot ought to respond.
Are the ID codes determined by each manufacturer, as
they choose? Or is there an intern'l body which allocates
them, such that each is guaranteed unique, just as
every telephone has a unique number?
A question concerning the car remotes; door lock, headlights, etc.
Each car/handset must be a matched pair, regarding the ID
and security codes. Obviously only one car in the parking
lot ought to respond.
Are the ID codes determined by each manufacturer, as
they choose? Or is there an intern'l body which allocates
them, such that each is guaranteed unique, just as
every telephone has a unique number?
Well, they have a chip that is programmed at the factory, probably with a sequentially-incremented number. The car is then trained to accept several key's serial numbers. The all-in-one keys/fobs have two chips, one operated by pushbutton with a coin cell for door unlock, and one RF-powered by the engine computer through a coil near the ignition lock, for immobilizer.
So, in theory, there should be no two cars anywhere that respond to the same code.
So, each manuf'r has its own allocation of ID numbers. And, presumably, its own
RF format. Are there FCC regs on that?
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