Unfortunately I think that I'm dealing with an "amplified stereo" in a 2003 Lexus GS300. The strange thing is, that the stereo is a "Base Model" and is only a Tape Deck with CD Changer Controls...No CD Changer even. Anybody know where the "Amp" is located, and/or another "fix"?
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Keep the good info flowing!
Got it solved. Found the Amp located to the right side of the CD Changer in the Glove Box. Used a "normal" 2-Plug Toyota harness that plugged in there to "bypass it" and extended it up to the stereo location in the front center console. Found the Speed Sense in the ECU Box, Driver's side Engine Bay in a 17-pin White Square Shaped Plug...through this Forum found the Reverse in the Driver's Kick Panel (RED / bue)...found Power for the camera in an "unused" harness behind the Left Rear Seat accessed through the Trunk. XM Sat and GPS Attennas needed to be mounted on the Left Side of the Trunk Lid as the leads BARELy made it up to the front...GPS specificially. Taking off the Glovebox to access the Amp was easy by the way....But did have to remove the bolts for the Fuse Panel inside the Engine bay to access the Wire Grommet to feed the Speed Sense Wire Through...it was still a tight manuever and my hand are nicely cut up from groping around down there. Total install time on a Pioneer AVIC-F900BT with XM/GPS/Bluetooth Mic/Backup Cam...was about 8 hours...2 of which some internet research...going to Starbucks for coffee...playing with the dog...
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Keep the good info flowing!