Xulfiqar is right in asking about the auto lights, since most japanese prii have automatic headlights. And you are right in saying that it's built into the indicator stalk with a sensor in the front end of the dash.
What I guess from the poster is that the lights that dim out once the parking lights are switched on isn't happening.
There's just one positive signal wire that triggers dimming of all dash lights once the parking lights are switched on... that seems to be the problem here.
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