Lighter socket always live?

Is there an easy (software?) way to make the lighter socket in the dash (of a 2001 E320 wagon) always live? My dealer tells me it's impossible, but my brain wants to remember that there's an easy way to
set it up that way, and a friend who made that a condition of sale got it just the way she wanted it...
I suppose I could go fiddle with some wires, but I'd rather go with the supported method if there is one.
Thanks!
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On 2004-12-02 18:32:44 -0800, William P.N. Smith said:

Run a hot wire to it and get away from that computer once in a while!
Marty
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On Thu, 2 Dec 2004 22:28:17 -0800, Martin Joseph wrote:

Run a fused hot wire to it. Mike
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