Needing the schematic / SM for this, or something thats perhaps close. Its made by Fujitsu ten for Toyota. The tape deck is a separate unit that
bolts to the radio unit , its part no. 86260-14180. Attaching a picture of the model sticker on the radio. The radio part works up to the amp IC's
which are MB3730's. The Vcc to them seems loaded down to only 4v and its using a UPC1185HC chip as well.