Not totally sure but:
1) when the ignition is turned off. i.e. the switch is not latching, same
as for fog lights
2) when aircon comes out of 'defrost mode'
Both apply to heated wing mirros as well.
Stephen, I'm not quite sure, but it could be switching itself off after
approx. 20 minutes or so. Do you feel that's about right?
If so, then it must be switched off by means of a timer or something. Maybe
one embedded in the body-computer?
And Nick is right about the non-latching switches, by the way.
Thanks a log guys for the replies. I recently had to replace the
connection in the boot, that conduits power to the rear window heater,
as it burnt out!. I suspect now that the ECU is acting-up, and not
switching off the heater. So from now on I'll try to remember to switch
it off manually before it burns out again.
I don't think you have a problem.
I asked the boss (my wife) who had a year 2000 Punto HGT, for 5 years W
reg. and she has just said that the window heater did NOT turn itself off
automatically. This had to be done manually or by turning the ignition off.
The non latching electronics/switch would ensure that it did not come on
again untill the switch was pressed with the ignition on.
Her Punto had aircon, NOT climate control.
Body ECU controls it I believe, switches off after 20 mins on my marea.
Now, does anyone else's heated rear screen automatically switch on
occasionally when you get in the car?
Mine does, never sure if it just a random error by the ECU, or there's
some clever feature that decides conditions may be right for the screen
to mist up and switches it on for you.
I've read somewhere that when you switch to full-defrost on the front screen
the electric heated rear screen switches on also (on some Fiat models).
I can tell you my 2003 Punto Sporting doesn't have this feature.
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