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Hi Jainla, The ECU of the telephone was installed in the center arm rest. I believe its sound came from the front right speaker.. nonetheless, I will test if I can reactivate the left back speaker by reinstalling it. Of course, I can take pictures (the car really looks horrible!). Please let me know what exactly would be of interest for you. Best, Alex

Hi Jainla, Thank you for your reply. It's a German LS430; from what I read so far, there seem to be some differences. First of all, it does not have Lexus Link. Also, there was no option to get a factory fitted phone here. The Siemens phone is aftermarket and I have removed the "brain" of the system. I am not sure, if there is still a relay in the car (I haven't found it), which might trigger the mute wire. If I start the car, I can hear radio/CD (and probably tape) sound just fine for a couple of seconds, before it gets muted. Do you have a wiring diagramm or can at least tell me which pins connect to the mute wire? Honestly, I have a hard time to follow all the cables and I am not sure which cables from the phone go to the radio. I have also noticed that one of the speakers seems to be dead (the left speaker on the back). I only have some seconds of sound, when I start the car, but this was enough to evaluate if the speakers are functional by adjusting the balance/fading of the radio. Could it be possible that this speaker causes all the trouble? Best, Alex

Hi Guys, I have a 2001 LS430 whose audio system has some issues. I have the ML audio system and an old handsfree telephone option from Siemens. First, there was some erratic noise even if the radio/cd was switched off. This changed a few days ago: When I start the car, I can hear sound for a few seconds and the the sound completely switches off. What I have done so far: - My amp was defective last year and I have sent it to the repair shop which did the repair (I had a 1 year warrany on their work). I believe they are very professional (actually, they are specialised on Lexus amps). They verified that the amp is working fine. - I removed the handsfree telephone module. I haven't found the relay, yet, for the mute wire. - When I got the amp back, I disconnected one of the 3 wire harnesses just to figure out if I can trace back where the erratic noise comes from (navigation, radio?). I believe it comes from the radio. Since I did this, the error changed (car starts -> a few seconds sound -> silence). - I bought a new radio/cd and installed it. The error did not change. Questions: - Could I have damaged something by disconnecting the wire harnesses? - How can I get into the diagnostic menu? I am not sure what is meant by "info switch". I have a "Option" switch and when I click on it, I have a "Information" button on the touch screen. Is this meant by "Info switch"? - How can I locate the mute wire? Where does it go (amp/radio) and which pins are used? Thank you for your help Alex

Hi Dedge, Have you been able to fix this issue? I have a '01 LS430 with exactly the same symptoms and I would be glad to know the exact cause in your case, so I can point the dealership to it. Thanks, Alex