Thanks for the reply, it's a 99 FRC, US car, we didn't get the FRC over here.
I have the same fob as your picture, same slider, same part No.
The fob pairs up fine and works as it should both in passive and manual but if you move it, around normally or shake it gently, it loses it's pairing until you pair it again.
The other two fobs are one I bought years ago and are for later cars I think, They don't pair and I just thought somebody might be interested in them for their car.
I didn't know you could alter settings via the drivers door memory switch, battery is new.
I read somewhere that the passive fobs have a mercury switch that causes problems, if I hold this one to my ear I can hear something sounds lose inside, I've taken it apart as there is a something rattling on the board but I can't pinpoint it. I also read that if the mercury switch is disconnected it can cure the unpairing.
The reason I was looking for a 97-2000 non passive fob was because I read that it is more reliable.