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