Help!! I can't get my rain-sensor wipers to work.....to make it worse..now I don't even know if I do have such function...

I was informed by the local dealership that my new car S60 T5 comes standard with the rain sensor.

After trying to play around with it and activitating it today, I found out that the rain sensor does not work. I followed all the instruction in the manual..which says the rain sensor activation is the same as using the Intermittent wiper function.

But it seems I can only get the intermittent function to work, not the rain sensor function.

I asked my dealer and they really have no clue..because it says on their spec sheet that it's standard on T5 (in my country)...and they also said I have a piece of black housing on the inside of windshield behind the rear-view mirror...which they say is the rain sensor...But again, I showed them and they couldn't get it to work either.

So my question is:

1. Is that black plastic piece behind the rear-view mirror for rain sensor? On those models without rain sensor, do they still have that same black piece, or no? I will check out the 2.0T version (which has no rain-sensor) and see if it has that black housing.

2. There are 2 possibilites....
A - either the dealer and the Volvo Taiwan distributor was mis-informed or lied to me about this standard feature...

B- I do have the rain sensor standard on my car..but somehow I just need to find a way to activate it...maybe need to be "turned on" through VADIS? if this is the case, and i hope it is...then does anyone know how to do this on VADIS? what is the function#?

Somehow I have a bad feeling that the catologue and dealer info were wrong...and my T5 does NOT have the sensor....which is gonna be a big bummer since it's also one of the reason i decided to pay more for a T5 instead of a 2.0T (of course, the 250HP engine is the main reason..). If case A is true, then maybe I can sue my local dealerhsip and distributor for false information? Maybe at least get some compensation or some sort....

Thanks a lot!!