DCM Data Signal Circuit between Navigation ECU and DCM: Description
WARNING: This page is about a different car, the 2010 Lexus LS 460L and 2010 Lexus LS 460. However, it is still accessible from the selected car via links, so may be relevant.
This circuit is used to send and receive signals between the DCM (telematics transceiver) and the display and navigation module display.