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Question About Ml Audio & Hdd

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Hoping maybe someone here can shed some light on this.....

I have a 2008 LS460, came with stock stereo (non-Mark Levinson) and navigation system. It does have the HDD for the navigation. I wanted to upgrade to the Mark Levinson head unit so I could play DVDs and record music to the HDD.

I was able to acquire a ML head unit, had it installed (with non-ML amp and speakers) and everything works fine except the record function to record music to the HDD. When I play a CD, the record buttons show on the screen but they are not hilighted so they can’t be pressed.

Does anyone know how the head unit connects to the HDD? Is there a different wiring harness for ML system than non ML that might have some extra wires?

I was able to get into the service menu, it shows the HDD and lots of space available for music storage, I just can’t get the record buttons to light up.

Any ideas? Thanks.

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