arielsdv

You could either get a used original head unit (the one with the cassette player on it), or you could get this thing MVA-81, plug it into the rear of your navigation unit, and then install a modern single din head unit with bluetooth and other options

Clay, you are the real hero my man!! I will most definitely explore this option (now with more confidence thanks to you). I do want Bluetooth connectivity so I found that there is a device that allows you to connect an aftermarket (single din) head unit which will replace the radio portion and modernize it with Bluetooth etc. It is made by "Beat Sonic" and it is the MVA-81. https://www.beatsonicusa.com/mva-81.html I would love to replace the entire thing and use something like that "Tesla unit" with the separate climate controls but I'll be honest, I'm afraid to go that route.

Clay, thank you thank you!! I will eagerly await your input regarding the second amp. I have been fearful of pulling the trigger on a second unit out of not knowing if the amp is the issue. I saw a few videos where they say that the amp off an LS430 would be compatible etc. I also saw a video where the guy stated that his original amp was at fault and pointed out how the fan would kick on for a second or two and turn off etc. He then installed the LS430 amp and the fan would turn on and stay on. The LS amp I purchased would do this, it would turn on and not stay on so I'm thinking it too is bad. I just don't know man.. It is frustrating as hell!! Had I known this, I honestly would not have purchased the car - I don't want to spend $1500-$2000 on getting a complete new system with new speakers and wiring.

Sorry TinaTank, it appears nobody really chimes-in on this forum unfortunately. Please please reach out if you find any further info. At least you have some sound coming from your system - I have zilch, nada!

BUMP - anybody? I'm hitting a roadblock here. I've contacted a few local stereo shops and they don't seem to have any experience with retrofitting the ML sound system. Any help/info would be greatly appreciated. I just don't want to throw money into an aftermarket head unit and then still have a no sound situation due to amp issue

I have an '04 with the NAV that I recently purchased and need your advise on a problem with the sound/navi system. The problem is as follows: There is no sound at all (from any of the systems). Previous owner claimed that the ML amp was at fault and that he sent it out for repair but never got it back. I purchased the 040 version from an LS430 as I read (and saw a video) saying that it is compatible. However, now that I installed it, I still have no sound coming from anywhere. Things I've checked/noticed: All three fuses (one in the driver's side and in the engine compartment) and all are fine. I noticed that when I switch the key on to ACC, the amp's cooling fan turns on momentarily and shuts right off within 1-2 seconds (not sure if that's normal?) I've noticed that when I try to increase the volume, there is no indication (a number or a bar) on the screen to indicate that the volume is in fact being raised. Not sure if that is the way these systems work? but I highly doubt that any car maker would make a stereo system that doesn't show what the volume level is. Questions: Is there a way to troubleshoot the amp itself to either rule it out or point to it as the culprit? If I go aftermarket (tesla screen, T'EYES CC3, Grom V-Line, etc..), which one should I get? also, do I still need to install and fix my amplifier issue or will the new system do away with that amp? Any input is welcomed, and appreciated. Thanks in advance!!