I'm attempting something that I'm probably going to regret starting so I guess that is the point behind this post as I'm wondering what I'm getting myself into with this mod.
I have two Smarts (an 08 Passion Cabrio and a 09 Brabus Cabrio) and I'm trying to swap some optional accessories. One of which is the rain sensor/light sensor. The Brabus didn't have this as an option and I really like those two features.
I know it requires swapping the windshield as well as the stalks on the steering column. Both of which don't concern me as I can have a glass company swap the windshield and swapping the headlight/wiper stalks looks VERY easy thanks to this guide. FQ101 : Smart Car Modifications
However, I was going through this online pdf technical manual for the Smart
(it's 39MB so if you haven't already downloaded it then takes a little while to get)
and it talks about the SAM control unit which says "The SAM control unit also communicates over: LIN B with the tachometer and the rain sensor/light sensor.(page 29)...When the autolight function is activated and darkness is detected, the rain sensor/light sensor sends a corresponding signal via the LIN B to the SAM control unit. This evaluates the signal and actuates the appropriate lamps over direct lines (page 101)".
Seems pretty straight forward...the question is whether the LIN B to the Sam control unit is activated properly, which if the LIN B also works with the tachometer (which the Brabus already has) then maybe this is plug and play? Hmmm, wishful thinking?
Any thoughts about what I'm embarking on here would be very much appreciated. It seems like swapping the hardware (i.e. the wiper/light stalks from the steering column, windshield and wiring) is doable, but what else will I have to do here?
My knowledge of the SAM unit is zero, I suspect swapping a SAM unit would be a no-no and the first thing that came to mind after reading that blurb was maybe this requires a "willing" dealer to activate them.
The tech manual also states on page 101 that the "Coming-Home function" is only a component of the autolight function. "The function is a component of the Autolight Function. When the vehicle is locked or unlocked, the driving lights are switched on for 12 seconds. The function is also activated by the rain sensor/light sensor; the position of the combination switch is immateral. The Coming-Home function can only be deactivated by coding in the workshop."
The dealer where I purchased the Brabus said they don't install these items (nor do they install any factory options...they just do add-ons), so they basically aren't any help.
P.S. The other items I'm attempting to swap out are the fog lights and factory alarm (I've already put the fog lights on the Brabus) and I've been looking for a guide or a diagram of the wiring. The technical manual doesn't really give enough detail of the wiring to know what's what.