C4 Picasso wiring diagram of brake switch

[Vikis]

Hello. I have a 2014 C4 Picasso 1.6HDI with a semi-automatic gearbox. It starts, but there is a "gearbox faulty" message on the dash, and the fault code is P0573, "Brake signal fault (switch/CAN) - Open circuit in Gearbox ECU." I've changed several brake switches, but it hasn't helped. Could someone please help me with the wiring of the brake switch? I think the cable might be damaged. Pins 1, 2, and 3 of the brake switch go to the BSI, and I've checked all of that, it looks good, and there's continuity. Where does pin 4 from the brake switch go? Does it go to the engine ECU or the gearbox ECU? Any help would be appreciated.
Vin: VF7**************[VIN obfuscated, can be read by forum staff]

[mickthemaverick]

Unfortunately I only have access to diagrams for vehicles up to 2012 but hopefully another member will see you request and help you out.

[Vikis]

I hope so! Also, I checked the cables from the alternator to the engine ECU, they look good, and there is continuity. I'm really losing hope of fixing it