Ford Fiesta heated windscreens not working

There seem to be multiple fuses and a relay also that could maybe stick now and again Ford Fiesta (from 2012) – fuse box diagram (EU version) Year of production: 2012, 2013, 2014, 2015, 2016 Engine compartment fuse box Ford Fiesta mk7 - bezpieczniki - komora silnika Ford Fiesta mk7 – fuse box – engine compartment Fuse Ampere rating [A] Circuits protected 1 40 Anti-lock braking system module 30 Anti-lock braking system, electronic stability program module 2 60 Cooling system fan high speed 3 40 Cooling system fan 30 Cooling system fan low speed 4 30 Heater blower 5 60 Passenger compartment fuse box supply (battery) 6 30 Body control module 7 60 Passenger compartment fuse box supply (ignition) 8 50 Automatic transmission 9 60 Heated windshield 10 — Not used 11 30 Starter relay 12 10 High beam left-hand relay 13 10 High beam right-hand relay 14 10 Water pump 15 10 Ignition coils 16 15 Powertrain control module, high and low cooling fan 17 15 Heated oxygen sensors (gasoline engines) 20 Power supply module (diesel engines) 18 — Not used 19 7,5 Air conditioning compressor 20 — Not used 21 7,5 Cooling system fan (1.6L Duratorq-TDCi) 22 — Not used 23 15 Front fog lamps 24 15 Direction indicators 25 15 Exterior lighting left-hand side 26 15 Exterior lighting right-hand side 27 7,5 Powertrain control module 28 20 Anti-lock braking system, electronic stability program 29 10 Air conditioning clutch 30 — Not used 31 — Not used 32 20 Horn, battery saver, keyless vehicle module 33 20 Heated rear window 34 20 Fuel pump relay, diesel fuel heater 35 15 Category one alarm system 36 7,5 Automatic transmission controller 37 25 Front door module left-hand side 38 25 Front door module right-hand side 39 25 Rear door module left-hand side 40 25 Rear door module right-hand side Relay Circuits switched R1 Cooling system fan R2 Heated windshield R3 Power control module R4 High beam R5 Not used R6 Not used R7 Engine cooling fan R8 Starter R9 Air conditioning clutch R10 Front fog lamps R11 Fuel pump, diesel fuel heater R12 Reversing lamp R13 Heater blower Passenger compartment fuse box Ford Fiesta mk7 - bezpieczniki - przedział pasażerski Ford Fiesta mk7 – fuse box – passenger compartment Fuse Ampere rating [A] Circuits protected 1 7,5 Ignition, autowipers, heated windshield, dome lamp, interior mirror 2 10 Stop lamps 3 7,5 Reversing lamp 4 7,5 Headlamp leveling 5 20 Windshield wipers 6 15 Rear window wiper 7 15 Washer pump 8 — Not used 9 15 Passenger heated seat 10 15 Driver heated seat 11 — Not used 12 10 Airbag module 13 10 Ignition, electric power assisted steering, instrument cluster, passive anti-theft system, anti-lock braking system 14 7,5 Powertrain control module, transmission selector lever, fuel pump 15 7,5 Audio system, instrument cluster 16 — Not used 17 — Not used 18 — Not used 19 15 Data link connector 20 20 Trailer module 21 15 Audio system 22 7,5 Instrument cluster 23 7,5 Multi functional display, clock, internal scanner, heating vents, air conditioning panel 24 10 SYNC, Bluetooth 25 — Not used 26 30 Heated windshield left-hand side 27 30 Heated windshield right-hand side 28 30 High quality power supply (vehicles with Start-Stop) 29 20 Rear power point 30 20 Cigar lighter, front auxiliary power point 31 — Not used 32 — Not used 33 — Not used 34 20 Keyless entry 35 20 Keyless entry 36 15 Ignition switch 37 — Not used 38 — Not used 39 — Not used 40 — Not used 41 — Not used 42 7,5 Rear view camera 43 10 Active city stop 44 7,5 Passenger airbag deactivation indicator 45 — Not used 46 — Not used 47 — Not used 48 — Not used 49 — Not used Relay Circuits switched R1 Ignition R2 Cigar lighter, front auxiliary power point R3 Not used R4 Active City Stop R5 Not used R6 Keyless entry (accessory) R7 Keyless entry (ignition) R8 Rear auxiliary power point R9 Not used R10 Not used R11 Not used R12 Not used WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

I've checked fuses they are different to normal ones, I will check relays in morning thanks

Quick look there at least 3 fuses and one relay . On some cars because of the draw from front heated window , it wont work with a low battery or until alternator puts more power into battery

Now that you say that I had a guy come out and remap car . The ignition was on but not started . Once he was finished I started car and because he had been sitting in it for 45 mins the windows had streamed up . I tried using them then n they didn’t work. I will take it for a run today and see .. thanks