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I have a 2005 LR3 SE V8 with the upgraded Harman Kardon sound system that I want to add a new modern head unit that has navigation, bluetooth, and a backup camera. I have an Alpine INA-W910 for this with a custom double DIN bezel that I will be using. I have done multiple installations of complex systems in less complicated cars (Ford Escorts, Subaru WRX, etc) but this one represents quite a new challenge. As I understand it, there is a separate Harman Kardon amplifier powering the door component speakers (not sure if amp has built-in crossover or if the speaker components themselves have crossover).

I am content with the sound quality of the current speaker/amp setup; I only want to modernize the head unit. I have been told that there is a wiring harness for the base head unit, but not for the Harman Kardon unit. Does anyone have any experience tapping a new source into the existing amplified speaker system? If so, is there a wiring diagram for the plug going into the amp? I would prefer not to have to rewire the entire car and buy new speakers and a new amp if i can.
 

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It will not just wire up. The system uses a MOST ring, fiber optic bus for communications. The IHU, which is built into the head unit, is the controller of the MOST. The actual audio signals are still transmitted to the amp via wires, however, without the amp receiving it's instructions on what to do from the IHU, it will not work.

I have not done, or seen it done, but you can remove the IHU from the head unit, it's the top section that has the fiber lines going to it, and you may be able to get it to work then. You would need to somehow input a volume control into the IHU so the amp would know what to do.

If you are set on changing the head unit, it will be much easier, and probably cost effective, to change the amp at the same time.
 
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