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the cig lighters stay on ALL the times (all 5 of them) as they are wired directly to the battery (via series of fuses).
If you are looking for a relay k72 (wake-on-LAN type, goes to sleep after 16 minutes) power, you can tap to it under the driver's seat, as the same wire under the passenger seat (LHD) is always hot, and does not go to sleep.
most headrest monitors only need power to them and they do not use too much - I still wired mine directly to the battery via a relay that is controlled by the "sleep" signal... This way, if any of the aftermarket things in the car start "drinking" too much juice when the car is off, the relay will cut off the power supply...
you can see some of the wiring in my thread that i linked in my signature...
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