Bad ML Amp? 2002 LX470 (LONG READ!)

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UPDATE: Don't bother reading. I think I'll need a YATOUR Y-splitter cable for the 5+7 connector for the 98-02 with ML. This doesn't appear to be a problem with the 03+ 6+6 connector (CD changer) folks.

Something with that 5+7 connector has something to do with the ML amp.

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Is the amp blown? 2002 LX470 with ML. Audio newb here. Here’s a lot of details:

BEFORE: All my speakers were blown, subwoofer unplugged and I was using this FM transmitting Bluetooth device that plugged into my cigarette port. Music sounded bad of course, and I had the radio crackling sound, but everything was fine. Then I decided to give myself a mini re-vamp. My CD changer magazine was ejected, as a possible suspect for a parasitic drain. After I ejected the magazine, my battery health seemed to be normal for a long time.

AFTER: Recently replaced front and rear lows with 4ohm. Preferred 8ohm, but was gonna try with the 4ohm with no plans in blasting my stereo. Subwoofer remains unplugged for now. Did not use the crossovers from the aftermarket speakers and everything went back to how it was plugged in: original factory harnesses and wiring for tweeter, mid, low for the front doors, and the rears were coaxial so just plugged them back in.

After that installation (sans driver front speaker setup, which was disconnected during this process) and sounds came out.. Everything fine. Finished the driver side.

Tried plugging in one of those YATOUR units that replace the CD Changer and gives me Bluetooth. Volume control, balance, all that stuff is greyed-out. Bluetooth and switching tracks appeared to be working but no sound.

During this process, the battery died. Could’ve been because my LX was sitting around in my garage for a week with no battery tender hooked up to it, and me testing some other things out for ambient lighting. Normally it would stay alive for a lot longer than that though. Hooked up a NOCO to my battery terminals over night to give my battery some charge.

So the next morning (today) I figured, this is weird. Switched back to AM and FM radio on the headunit and same thing. No sound, everything greyed-out.

I get the headunit beeps when hitting buttons, toggling between radio, climate control and all of that.

Checked the radio fuse in the engine bay, that seems normal.

Removed the negative battery terminal, thinking maybe something needed to get reset from the communication from head unit to amp but same result.

I do hear some relays triggering on when starting up the LX, but not certain if that’s the amp or not.

I haven’t lifted the passenger seat up to confirm if the amp is getting power.

Now, I’m leaning towards a complete NAV delete at this point. I’m still getting a “program disk is inserted” message upon start-up that persists and may be related to a burned copy of the NAV disk. Things like Trip Information, those don’t work and doesn’t display any information. So with that still needing to be troubleshooted…..

If I do a NAV delete, I can completely bypass the amp and just rely on the headunit right?
 
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I went through this with my GX470 Mark Levinson amp. I initially thought it was the amp and then realized it was the head unit.
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"I get the headunit beeps when hitting buttons, toggling between radio, climate control and all of that."
>> That is your sign that the amp is working . Your head unit may be the problem

Its been a while since Ive worked on a ML audio system but reach out to OEM auto audio he will help you diagnose what's wrong and get you repaired. I think I paid like $185 for repair . info below. He is familiar with these systems so trust what he is saying

Joe Flaherty
OEM Auto Audio, Inc
315-430-8087 (call or text)
8043 Broadfield Road
Manlius, NY 13104


OEM Auto Audio Inc.
 
I just read more details on your post, Is that third party bluetooth thing still installed in place of your CD ? If yes, remove it for sure. To help diagnose and to just go with a more well known model like the USA SPEC BT45
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As for the nav delete , Im not super experienced with that but a lot of people do it and more info can be found on MUD.

Another option

>>Looks like there's finally a new option for 98-02 factory Nav replacement! - https://forum.ih8mud.com/threads/looks-like-theres-finally-a-new-option-for-98-02-factory-nav-replacement.1343810/
 
I went through this with my GX470 Mark Levinson amp. I initially thought it was the amp and then realized it was the head unit.
---------
"I get the headunit beeps when hitting buttons, toggling between radio, climate control and all of that."
>> That is your sign that the amp is working . Your head unit may be the problem

Its been a while since Ive worked on a ML audio system but reach out to OEM auto audio he will help you diagnose what's wrong and get you repaired. I think I paid like $185 for repair . info below. He is familiar with these systems so trust what he is saying

Joe Flaherty
OEM Auto Audio, Inc
315-430-8087 (call or text)
8043 Broadfield Road
Manlius, NY 13104


OEM Auto Audio Inc.

As far as back of the headunit, there are no connector types that should be the same right? I disconnected everything to pull the whole headunit out to get a clearer view of the CD changer connector, since I ordered the wrong Yatour unit.
 
I just read more details on your post, Is that third party bluetooth thing still installed in place of your CD ? If yes, remove it for sure. To help diagnose and to just go with a more well known model like the USA SPEC BT45
------
As for the nav delete , Im not super experienced with that but a lot of people do it and more info can be found on MUD.

Another option

>>Looks like there's finally a new option for 98-02 factory Nav replacement! - https://forum.ih8mud.com/threads/looks-like-theres-finally-a-new-option-for-98-02-factory-nav-replacement.1343810/

No, I removed it and still the same result.
 
As far as back of the headunit, there are no connector types that should be the same right? I disconnected everything to pull the whole headunit out to get a clearer view of the CD changer connector, since I ordered the wrong Yatour unit.
I tried to find a picture but couldnt .... but no I don't think there is any way you could mix up the connectors

I haven't worked on the audio in the 100 or 470 in a while so not sure the best way to diagnose. Other than, if you get the beeps i was told that means your amp is working .
 
I just had a revelation. I left the CD changer unplugged from the back of the head unit after uninstalling the YATOUR unit. After reconnecting it, all those options like Fade, Balance, Volume etc came back. Very bizarre. This is the older style 5+7 connector, not the 6+6 connector that the 03+ head units have. Something with that 5+7 connector may be related to the amp.
 
First of all, hugs. Second, if you want an absolute fix, you can bypass both HU and ML. You can deploy a Digital Sound Processor with Bluetooth capability (built-in or Bluetooth dongle) and a 5-channel amp. Your phone > DSP > Amp > into 4 speakers and 1 sub. Your phone will be your source, and DSP's control knob will be your volume controller. Price range can be low or sky-high.

I run YouTube Music/Tidal > Mosconi Aerospace DSP > 2 amps > 6 front speakers/front sub/rear sub.
 
First of all, hugs. Second, if you want an absolute fix, you can bypass both HU and ML. You can deploy a Digital Sound Processor with Bluetooth capability (built-in or Bluetooth dongle) and a 5-channel amp. Your phone > DSP > Amp > into 4 speakers and 1 sub. Your phone will be your source, and DSP's control knob will be your volume controller. Price range can be low or sky-high.

I run YouTube Music/Tidal > Mosconi Aerospace DSP > 2 amps > 6 front speakers/front sub/rear sub.

TELL ME MORE!
 
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