Interesting, so it seems as though that early mk5s need the memory seats but later ones just needed the sensors...
Out of general curiosity, would you have a link to the brochure, wouldn't mind having a read of it.
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Jetta brochure - Volkswagen Australia
There seems to be a difference between the mirrors of the Golf and Jetta, the Mk5 Golfs have a different mirror with memory module integrated however maybe the early Jettas didn't and relied on the electric seat memory module whereas the later models adopted the memory module integrated into the mirror
My July 2006 built Jetta (delivered in oct 2006) has the mirror dip on the LHD mirror. It works perfectly although occasionally needs to be adjusted but I think this is because the wife forgets to turn the switch back from L to O and adjusts it because it's angled down.
Note mine was delivered with only metallic paint as an option. It's a 1KM diesel with the BKD engine.
I hope this helps.
My MY08 Golf GT has parking sensors, but no mirror dip (that I can make work)
This is interesting, i have a 2009 Pacific TDI leather seats and rear parking sensors. I do not have mirror dip.
There is no option in the MFD to enable mirror dip. I would like it.
Am i missing something?