Quote:
Originally Posted by svandamme
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Remote 2 would be hopelessly outdated, and his list would not have a single valid code left.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.
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Thanks for the highly detailed response !
You asked what car; my car is a Boxster 1998, meaning model 986 (2.5L) (confirmed from the original, beat up owner’s manual - I’m the 3rd owner of this car).
I made sure the new key batteries were fine by swapping them between keys, and as you said the “RFID pill” must be ok on the key whose remote isn’t working, because I’m able to start the car with it. I presume this RFID pill is not located on the key’s circuit board but rather sunk somewhere else in the body of the key. That also means I got lucky not to damage it, because the darn key cover’s clips aren’t working anymore and I fixed that by drilling and installing 2 small screws to keep the cover closed...
So, if the above is correct, all I have to find is a replacement key’s internal circuit board because the real reason the LEDs and remote functions don’t work is because that circuit (which you refer to as the remote) is dead. Does Pelican Parts or any other outfit sell only this circuit board?