Hi

I'm looking how to connect BT phone to the GS (to the speakers), and I found below picture:




There is a "Telephone transceiver and speaker relay"

what is this?

Cables are: TLMT (telefon mute?) and speakers (but why rear door?)

Is this something that I should buy and connect to BT-something and then to the phone?

thanks.

Probably has to do with the optional Lexus phone.

You could use this as an aftermarket solution
http://gromaudio.com/