What does the PCB electrics board/chip in a key do?

This is the place for all your Diagnostic related questions or advice.

Moderator: RichardW

Post Reply
Ramc4
Posts: 41
Joined: 02 Nov 2019, 14:19
Location: Scotland
My Cars: Citroen c4 coupe 2006
x 1

What does the PCB electrics board/chip in a key do?

Post by Ramc4 »

I mean a NON remote key, they have both transponder and an electronics board. As far as I know the transponder works on it's own and is powered by the RF signal from the cars transponder. So again what exactly does this PCB do?
Peter.N.
Moderating Team
Posts: 11575
Joined: 02 Apr 2005, 16:11
Location: Charmouth,Dorset
My Cars: Currently:

C5 X7 VTR + Satnav Hdi estate Silver
C5 X7 VTR + Hdi Estate 2008 Red

In the past: 3, CX td Safaris and about 7, XM td estates. Lovely cars.
x 1205

Re: What does the PCB electrics board/chip in a key do?

Post by Peter.N. »

Not come across this - other than the transponder, but I would suspect if they make a remote version the fob is common to both, I assume it doesn't have a battery in it?

Peter
Ramc4
Posts: 41
Joined: 02 Nov 2019, 14:19
Location: Scotland
My Cars: Citroen c4 coupe 2006
x 1

Re: What does the PCB electrics board/chip in a key do?

Post by Ramc4 »

Ah you right i think I must have been thinking about the circuit board in the remote key. Doh.
Activa TCT
New User
Posts: 26
Joined: 16 Dec 2019, 20:16
Location: SLOWenia
My Cars: Leaning tower of PSA
x 2

Re: What does the PCB electrics board/chip in a key do?

Post by Activa TCT »

There's no pcb in a non-remote key.
Just a tiny rice-grain chip that responds to car's immobilizer coil. About the same thing as rfid.
Chip has only a coil and requires no batteries.
Post Reply