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Front and rear windscreen heaters not working

Colin Streeter
Colin Streeter
in Ford Fiesta Club

Featured Replies

I am in shock,felt silly trying but it has worked.someone said start the car,press your rear fog light button 5 times then turn your hazard lights on and off 3 times.then look and you should see the red battery logo flash on  and off on the dash and stops. 

then try and it felt silly but both are working now😊.

If don't work try again with heater off as I did.Guessing it has something to do with resetting the computer settings.

I am shock to see someone was told by a ford dealer can change the computer for £450 and might not fix it.

(So give that dealer a miss even name and shame as he might have done this trick and charged you for a new computer)

Thanks for the guy that told me this on here good luck everyone 👍 

 

  • Quote
    • Sad 1
    • 2 weeks later...


    Tried this on my 2010 Fiesta Mk7. No red battery logo appeared. And my heated windscreen still dead. Still feel silly :-D

     

     

  • Quote
    21 minutes ago, Nic Williams said:

    Tried this on my 2010 Fiesta Mk7. No red battery logo appeared

    Two reasons for that. Firstly a 2010 Fiesta does not have a BMS fitted so you can't reset what's not there. Secondly the advice above is not something that should be done. The reset of the BMS is only for when a new battery is fitted. Yes it may have worked temporally for Colin, but his battery charging algorithm will be wrong as the car's BMS now thinks it is charging a new battery.

    Use a multimeter and measure the exact voltage at the battery terminals, and let us know what it is.

  • Quote
    • Like 1

    Good to know, thanks unofix. 
     

    my trouble shooting so far….

    Battery voltage is 12.54V.
    60A fuse in engine ok. So are the pair of 30A fuses in the passenger box. 

    The windscreen relay appears ok with continuity across pins 1&2 and the switch across 3&5 is open. However I’ve not yet checked the switch closes when 12V applied. 

    No volts at either of the 30A fuses when I switch on (but button light works) so I don’t think it’s the windscreen itself that’s the problem. But I’ve not checked connections under the trim yet.

    Thinking I’ll try a new relay to rule that out but after that I’m stuck for ideas 

  • Quote
    3 hours ago, Nic Williams said:

    No volts at either of the 30A fuses when I switch on

    There is only voltage present on these fuses when the engine is running.

  • Quote

    I tested when engine running and button for heated windscreen was on. 

  • Quote

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