Well, I gave the dealer the information from the discussions Fenwick223 recommended, and they told me that while the internet is useful for a lot of things, it's not that useful for diagnosing car problems. So, after 2 days and $120, I got my car back in the same condition it was in when it was dropped off. Luckily, I have a buddy that is a mechanic, so he picked my car up from the dealer, took it to his shop and put in the new relay control module and I haven't had any problems since.

Also, just so everyone is aware, cost of relay control module from Mercedes was $125, while the same part from Chrysler was $220. The module that was taken out of my car had the Mercedes part number, so I went with the Mercedes part and saved $100.

Thanks to everyone for their help on this! I'll keep you all updated if I have any other problems.