My son has a 1999 ram, a friend of his closed the passenger door and the radio quite . The radio still has power but no sound. Today we pulled the radio and put it into my truck and it worked fine . Any ideas ????

 

.................................I guess you could check the speakers connections...that involves taking the door panels off. Do you know if it has the optional infinity system in it?

 

Yes it is a infinity system.

 

I have never messed with the infinity radio's in a 99 ram. The only thing I can think of is maybe one of the connections came off, so it makes none of the speakers work. The reason I dont see that happeneing is bcuz I think the back speakers should still work tho, cuz in my buddies 98 infinity system the front speakers are amped, but the back are ran off the radio. I guess if you want to try and figure this out yourself, you need to take the passenger door panel off. You do this by taking the screws out of the door handle and one screw up by the mirror. Once those are out you need to pop all of those stupid plastic peices off that hold the door on from behind the door panel. If you are carefull you can reuse most of those, but you can by replacement ones for pretty cheap. Once those are popped out, pull the door panel up and get the door handle threw the hole. Then unhook the window and lock connections. The speaker is held in by 4 screws. Now that this is all done make sure the speaker connection is good and re-try. If it still doesnt work let me know and we can go from there.

 

Well we tryed the door speakers with no luck

 

Ok now take the speaker and hook it up to a house radio or something along those lines and let me know if it works or not.

 

We pulled the passenger door speaker and plugged in its place a speaker from another car with no luck.

 

Hook the passenger door speaker to another radio of some sort, jst to make sure its not the speaker.

 

Today we pulled the passenger door speaker and plugged it into the home stereo it works fine

 

You need to disconnect all speakers in the vehicle and plug them in one at a time to see if there is one bad speaker that is sending the unit into protection. You also should do a continuity check on the lines from the headunit to the speakers. If one of the wires is going to ground, this will send the unit into protection and no soup for you in that vehicle. This would explain why it works in another vehicle. TO me it sounds like a wiring issue.