I put the electronics under a microscope to hopefully see some die markings.
The main MCU is from ST with the silicon die marking #FL62X2 and has 172 bond wires attached. Of course searching for that marking yields nothing.
But the fact that it is made by ST should narrow it down considerably. As far as I know, the only automotive-grade MCU made by ST is the #SPC5 (PowerPC, like the MPC5xxx).
But of course it could be something completely custom, who knows.