Quote:
Originally Posted by Aerocorp
Interesting thread [not the flaming part - cool down guys ok ? ;-) ]
I recently replaced the battery in my 2 keys, but one is refusing to work for remotely locking or unlocking the car; the red LED doesn't blink when I press the button for that function (same story for the 2nd button to open the rear trunk if I remember right). HOWEVER the key will start the car.
I'm hoping that means I could just buy a replacement circuit that goes inside the key for not too much $, and I'd be back with full functionality.
Right or wrong ?
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What car?
the remote of unused keys go out of sync and can be resynched.
It's in the manual of my 987
pretty sure something similar is in the 986 manual, the remote uses a rolling code, it works the same for most rolling code systems
Basically they both have a list of codes
Code 1=
ABC123
Code 2=ABC124
Code 3=ABC125
Code 4=ABC126
Code 5=ABC127
When somebody pushes the button on a remote
The remote sends that code to the receiver
Remote > receiver
ABC123
Receiver says, OK, opens the gate
And they both update their list
Code 1=
ABC128
Code 2=
ABC124
Code 3=ABC125
Code 4=ABC126
Code 5=ABC127
If you have a remote somewhere
It still has the old list in it's memory
So push that button.
Remote > receiver
ABC123
receiver plays dead, ABC123 is no longer in its list
Remote > receiver
ABC124
Receiver says ok
Opens the gate
both update their list
Code 1=
ABC128
Code 2=
ABC129
Code 3=ABC125
Code 4=ABC126
Code 5=ABC127
This is very simplified.
But if for instance somebody would use the same remote over and over again.
and leave the Second remote in his safe, un used for a year.
Remote 1 would know the right list of codes
Remote 2 would be hopelessly outdated, and his list would not have a single valid code left.
remote 2 would say
ABC 123
When the other remote and the receiver have codes that are by then ZWY9xx range.
Again, very simplfied, the codes are a lot more complicated
the list is a lot longer.
But essentially remote 2 would stop working till a resync of the rolling codes is done.
And you can pretty much sync any remote control electroic if it's the same frequency, and uses the same kind of codes. (All Porsche keys from the same model era use the same, for obvious reasons)
The only thing you need, is the right Immobilizer RFID, that is accepted by the car.
The RFID bit is non electronic, it's a solid state thingiemagic that is very durable.
no moving parts, no current needed, it hardly ever breaks.
So if you have a good RFID pill
You can resync the rolling code in the electronics in the key remote
And i'm pretty sure you could even get a spare key online
get the eletronics out
put it in your own key, with your own RFID pill
and resync that via the same procedure.
But you need the right RFID pill from your own key. Which you have since you can start your car with that key.
You should be able to either resync the key with a new key battery in it
OR
transplant the remote from another key, and resync it with your own RFID pill , to your car.
That's all I have been saying all along.