Fog or tail light mode (coming, leaving home)

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I think he/she means that the lights come on momentarily when you lock/unlock the car. They're kinda the standard on modern cars these days.

For an N16 it'd be relatively easy as all you'd need to do is run a source to the interior courtesy light. For an N15 it'd be a PITA although not impossible, especially if your aftermarket alarm system has the option.
 
You cant just run a feed from the courtesy light Mike, as everytime you have the lights on to drive it would back feed the circuit and the courtesy light would come on.

You'd need to use some diodes to ensure the current doesnt feed back or install a relay to control it.

As you've said though its not impossible.
 
I didn't elaborate but in essence, what you said was what I was on about as obviously a direct link to the interior light is stupid.
 
Regarding the courtesy light, it should work to use the interior light feed to switch a relay with a delay off timer.

N15, I dont see why a similar setup cant be used but take a signal off the central locking to operate the timer
 
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