Obtaining Toyota amplifier schematics

I have the electrical wiring diagram book. It has the wiring for the whole car. It does not show the internal workings of the AMP but does show how it is wired to the audio system.

Charlie

 

Assuming you're looking for schematics of the innards, this might be of interest: http://www.priuschat.com/forums/reducing-t...amp-vt7812.html. The photos show which parts are in the signal path.

 

I thought about that too. There are a few test terminals in one of the long ends of the JBL amp circuit. I don't have an ocsilloscope, but maybe brosnan can help us here and see if probably a couple of those test signals correspond to the analog post-processed signals before they hit the power amps.

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Everything seems to indicate that the crossovers are digital, however, when looking at the power amp stages they seem to differ on few components, so there's still a change of analog filtering right on the power amp ICs.
There are four power amp ICs: one for front woofer speakers, one for fron tweeters, one for rear speakers (both woofers and tweeters) and lastly one for the center speaker (only one channel is used there).

 

It seems very likely you could grab the analog signals right before the power amps and rewire them to go directly to the output (for external amplification). This would have all the filtering operations in the DSP already done, which likely does include the crossover function. So if you suspect the sound quality is being messed up in the DSP (rather than the output amps), it might not be helpful.

 

Isn't the goal to get AVC control of the signal BEFORE digital processing? I don't think the power amps were the problem, but rather the digital signal processing, which is what AVC uses to control the signal.

 

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youre theman now dog

 

is this what you are talking about?
http://tom-morrow-land.com/tests/priusaudio/JBL_AUDIO_SCHEMATIC.pdf

 

While informative, unfortunately it's only the electrical "Block Diagram".
Getting a schematic, much less a full Service Manual out of some manufactures is like pulling teeth! I have been doing board level maintenance for the last 40 years. We were always sent to a Manufacturers Training session, which included a full set of Service Manuals! Now, you get the line, "Oh sorry, that's proprietary information". You have to pull teeth to get info!
If you ever find a actual schematic, I would love a copy!