As promised:
The electrical diagram, the partlist is in dutch so I didn't bother to scan that page.
In the 1st image I colored the econ light green.
In the second image I highlighted the wire connection on the ecu in green.
The wire-color you must search for is white/red.
If you can't find it I'm willing to make a (in car) picture of the ecu connection location.
(Beware the US electrical diagram may differ from the europe ones.)
If you zoom in you'll see a little referance "star" (*) left above the symbol, the translation;
* niet op alle modellen aanwezig = *not present on all modells
