Originally Posted by Ham

i know this is a old post but where do you get the 12 volt constant? Thank you

Originally Posted by salimshah

There are different original equipment in the GS model.
Also +12v use depends upon your new load (current draw requirements). For high output [more current draw] you may need a dedicated 12v supply line from the battery.

Another important detail which is missing in all the discussions is.
Lexus uses a proprietary serial link protocol do talk to all the various components. The information to turn on devices is through that link.

If you are embarking on this journey for the first time, also note that Lexus uses dual differential [l+,l-,r+,r- and no ground] audio signals which have non standard [l,r, gnd] line level ... standard audio use 1v rms as AUX in/out level. <- Ignore this stuff if you plan t rip out the OEM stuff.

Salim

Originally Posted by salimshah

There are different original equipment in the GS model.
Also +12v use depends upon your new load (current draw requirements). For high output [more current draw] you may need a dedicated 12v supply line from the battery.

Another important detail which is missing in all the discussions is.
Lexus uses a proprietary serial link protocol do talk to all the various components. The information to turn on devices is through that link.

If you are embarking on this journey for the first time, also note that Lexus uses dual differential [l+,l-,r+,r- and no ground] audio signals which have non standard [l,r, gnd] line level ... standard audio use 1v rms as AUX in/out level. <- Ignore this stuff if you plan t rip out the OEM stuff.
I have the same system you have at least from looking at the pics you posted i do
Salim

Originally Posted by BiGEZ

There is are 12v constant and acc. wires on the OEM harness that connects to the back of the radio. You will need to use a test probe to find them, wire colors differ from year and model. Either splice or cut them to get your power.