The same problems here. Picked up 3500 Laramie 600 4WD with Nav radio and Sirius in Boise ID and it worked until I was twenty minuets from Boise. Next stop was Yakima WA to pick up a camper, local dealer basically looked at it and said I TRIED TO BY-PASS THE CUSSING FILTER howdy never seen one of dem thare thins befo. Next stop Vancouver, BC had to make appointment at dealer for the next day and the next day it worked for the first time in 500 mi. and albeit for only minutes. Their response was if it isn't broke we cannot fix it. Next stop Masset QSI, during our weeklong stay the radio, nav and Sirius worked intermittently. That did not bother me because the salmon fishing was terrific. Next leg was back to Vancouver via the Rocky Mountain Trench. Great scenery. On the trip home to CA I had to pick up dry ice for the salmon and halibut in Salem, Oregon. While there, I stopped at Withnell Dodge to see if they could help with the radio. What a surprise! I was immediately sat in a comfortable waiting room with TV, coffee, current magazines & internet while they immediately got to work on my truck. In very short order, the tech was in to talk to me and said he had the radio apart on his bench and the cooling fan in the radio did not work properly causing the thing to overheat and shut down. He went on to explain that DC is a little anal about radio replacements and the week or more it would take to get one probably wouldn’t fit in my plans. He cheerfully reassembled it and apologized that it would only work for a while. What a dealership, new & used 2500 & 3500 diesels everywhere and in the huge clean service area they actually had many people that knew how to fix them. They were a class act. At a truck stop in Eugene, OR, I picked up a cheap transistor radio that I got good at balancing on my shoulder and listening with one ear while tuning between cities. My salmon and I arrived home safely. The next day I was off to the local dealership to see about another radio. After much checking of vin numbers, it was finally established that, this was indeed, a factory installed radio and they would replace it. I asked if it could be replaced with a RB1 type. I was told not possible, as it would not fit. We all know better than that don’t we. After much debate it was discovered that yes, they fit. I offered that the radio I have costs about 1300 dollars and the quality radio is in the neighborhood of 1500 and I would be glad to pay 4 or 500 dollars not to have this piece of crap. The answer was NO because the dealership would be stuck with a used radio. Well yes about 5500 mi. used and a couple of hours of actually working. Sooo in about a week and a half the new piece showed up, it took a while because DC probably was doing background checks on me. Made another appointment to have it installed and the next day and I was going to have a working radio. Wrong. Upon arrival at 8:00, I asked about how long it would take. They could not tell because it depended which tech was assigned as to when it would get started and furthermore the satellite estimator was not working. I stated that Withnell Dodge had removed repaired and replaced the radio in one hour. They said they would call in an hour when the magic satellite estimator was able to post the time required. That would probably be another DC electronic device.
While I was sitting there waiting I asked if anyone new where the blue 4 pin plug for the brake controller was as I had looked all over for to left of steering column. They wanted a minimum service fee of 40. 00 for that information. I had a friend drop what he was doing to come and take me back to his shop where the atmosphere was a little more friendly and nowhere as disorganized and filthy. Waited there for two hours and finally rented a small Chevrolet that had a radio that worked all the time and proceeded on with my life. Later I called and found out the thing had bean fixed but the paperwork could not be completed without the magic satellite estimator thus no one could call me. Returned rental car and my friend drove me to the dealership. I was handed my key, no no I exclaimed my keys have one push button thingy for the dodge, one grey dodge key and two keys for the camper. Much confusion ensued and the rest of the keys were eventually found. I was finally on my way. My am worked, fm worked, nav system says “install disk” oh crap, back to dealer and said I have no west coast disk, reply we don’t have your west coast disk. I asked did you take it out of the old radio. Their answer was the radio did not work so we could not. By this time it was 6:00 pm and I was pi$$ed and becoming very loud. A tech must have heard the may lay up front and sheepishly appeared with a box containing two new disks that were shipped with the new radio.
Finally it was over!!! I stopped and installed nav cd and asked it to take me home while listening to soothing music on my sirius radio. Life was good. Stopped by a store to pick up a few things and returned to the truck to find satellite radio came on with a loud escaping steam sound. I won’t even repeat the dialogue that came forth. The sweet young voice in the nav department calmly guided me toward home with fm radio loudly playing acid rock while I tested how fast I had to go to get her to stutter. About three blocks from my house she wanted to go any direction but on the main rout to my house. After playing with it over the weekend in different areas the problem seems to be centered around the fact that roads that are newer than 15 or so years may not exist on cd files. My street was put through 16 years ago and before that, you had to zigzag thru side streets. The Sirius radio works properly from time to time, but it’s not worth taking a chance of full volume static on start up. I went to another dealer today and was told I would have to leave the truck there all day Tuesday to have the sirius problem investigated and my 6000 mile old A pillar plastic replaced.
Boy do I feel great having a truck with every available option including a pos radio system that works on occasion.
For the nav system I will rely on my good old Garmen gps. For radio, I still have my trusty $7. 95 truck stop special.
There is a bright side, after six visits to dealers for same problem I am starting to smell lemmons and a 2005.
And yes the radio in the adverts for the truck definatly showed a color RG1 map screen.
Garry
Ps – sorry for the long read.
Attention: TDR Forum Junkies 
They repaced radio again and this time still no sound after this replacement. Ordered a new AMP. New amp came in, installed and worked when drove home. Next day (today) NO SOUND :{ 
