You shouldn't have a dongle, your bluetooth should be integrated into the main radio unit correct?

2008 and older had a dongle in the center console.

http://www.youtube.com/watch?v=kpEGIfBvF1Y I know this video uses a c-class for its demonstration, but it is almost the exact same on yours.

On your blackberry, you will have to search for bluetooth devices after you put the car's radio into external authorization mode.

Your blackberry should find the mercedes phone system, click on this with your phone and type in the pass code 1234, then 1234 on your radio. it should now be paired. Let me know if you have any trouble, I have paired hundreds of phones and surely will be able to help.

Oh ok, your information said 2009

Then hold down the button on your dongle in your center console until the blue lights start flashing rapidly, search for bluetooth phones with your blackberry. Click on the mercedes phone system and when it asks for a passcode type in 62872.

Your phone should now be paired

Were the blue lights flashing rapidly on the puck?

Do you mean you got it working?

Your welcome, I try for an excellent rating so please let me know if you need anything else.