Chainu127

iTrader: (1)

Someone should trace the I2C lines back from this audio processor chip. SCL and SDA should have pull-up resistors somewhere to Vdd, and they should also be connected to a microcontroller. Since it's I2C, I don't know what else might be on the bus. Of course there may be more than one chip connected to these lines since I2C devices are addressable, but ONE of the chips should be the microcontroller supplying I2C master data. That would be assuming there's only one uC on the main headunit module that contains the firmware.

Jon316G

iTrader: (1)

Here is the PDF for the larger QFP (with the two white paint pen dots):
Fujitso MB90F549G.pdf
It appears like this is the likely suspect.

I'm sending the information to another tech who programs components to see if this is something we can do in-house.

ambulanceonfire

iTrader: (3)

what happened jon! don't let the dream die!

Jon316G

iTrader: (1)

I gave the data sheet to the tech who programs components... just waiting to hear back from him.

alz0rz

iTrader: (41)

Might wanna ask mazdaparts.org - they offer HU software upgrades...

Jon316G

iTrader: (1)

^Thought about it... just didn't think they would disclose that kind of information since its possible I could "compete" with them if I'm able to produce multiple chips myself.
Guess worse they can say is, "f*ck off"

ambulanceonfire

iTrader: (3)

I tried. He never even emailed me back.
I also emailed some other radio specialist types across the web without success.
The most i ever got back was that i needed to buy a new HU.