jvrcb17

Hello,

Does anyone know where I may source datasheets/pinout diagrams for OEM stereos? I'm attempting to build a harness to install an aftermarket headunit, which is supposed to be compatible but unfortunately didn't include the correct harness adapters. I'm specifically looking for a '14 RX with navigation (non ML), and the closest I found was this diagram: https://pinoutguide.com/Car-Stereo-T...5_pinout.shtml for an IS. It has the exact same connectors and layout, so it MAY work, but I wish to be sure and use the ones for the RX. Any help would be appreciated.

salimshah

Not answering your question here, but adding things for your awareness. This is from my experimenting and measuring audio signals in RX Gen1.

Lexus uses proprietary Serial Protocol for communication amongst Audio components.
Lexus uses non standard signal levels between components and differential signals to reduce interference. [look for L+,L-, R+, R-]

So as you look at wiring diagram, do not expect the signal levels will match standard audio equipment.

Lastly, please share what you find.

Salim