Quote:

So, whatever your car supplies on the illumination wire, that's all the empeg's got to go on.


If it's like my VW Polo ('00) then it's a PWM signal, at around 85 Hz IIRC, going between effectively round 3 and 12V at min and max illumination level for the dash. It was always active due to the automatic daylight running lights.
Also had some initial problems, probably due to the PWM nature of the signal, causing erratic behaviour of the dimmer (random activation), so I disconnected the wire and planned to run a wire from a terminal on the light switch (for the proper "lights on" position), but never got around to it...
IIRC the behaviour on a PWM signal was fixed in a later software version, but I never tested it.
_________________________
/Michael