Dad's 2005 Peugot 206 1.4 has developed an annoying and potentially dangerous fault where although the switch is off, the headlights turn themselves on and off at random. This first occurred 2 or 3 years ago and he took it to a local independent garage. They thought it might be the automatic lights and said they had disabled them. Well, as far as I can see the car does not have automatic lights, and never has, and the fault remained! It cleared itself some weeks later.

The fault has now recurred. Fiddling with the stalk and the wiring and thumping the general area has no effect, which made me think originally that it was not a simple switch fault. When the driver's door is opened, even with the lights off, there is a two-tone warning sound which I think is the lights-on warning, and the battery runs down over a period of days, suggesting something is ON, though nothing seems to be. When the ignition key is turned after the car has been idle, the dash display shows "ECO-MOD" which is the annoying mode it goes into to save battery power if you try to use the radio for more than 20 minutes without running the engine!

Now, in addition, the indicator flashers are not functioning, whick makes me think that possibly the fault IS in the switch after all. Does this seem a reasonable deduction?

I don't have a manual, but is replacement a straightforward job (or a steering-wheel/airbag-off nightmare)?