Signum and Vectra C ones (I assume) have the chip soldered to the PCB unlike Zafira A ones which are separate. I have two pics, one of the chip on the board and one with it removed.
Pic with chip in place.
Pic with chip removed (one of the solder points came off but it's not actually connected to anything (top right corner).
If it doesn't work then I've only lost a few quid as it didn't work anyway, lol. If soldering a new chip on works then that's saved me a fair bit of money.