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i have 4 unused buttons.....one would be for fog lites, two would be for heated seats so what would the fourth one be for?
 

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button bank is 1) drivers side seat heat, 2) front fog lamps, 3) rear fog lamps(?) 4) central locking, 5) emergency flashers, 6) central unlocking, 7) tow away sensor/motion sensor, 8) TPMS reset, 9) pass seat heat

Buttons area momentary contact so to use them to power anything would require adding a latching circuit
 

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I used the unused button with a latching relay and timer to activate my aftermarket stereo with the engine off. It’s a toggle on/off and turns the stereo off in one hour if accidentally left on.
 
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