Its for installing an auxiliary audio device, like a CD changer or a satellite radio. You have to remove your radio to attach a device to it.
There was no auxiliary input in the 2003 Toyota matrix and was not optional the first aux was for the 2006 matrix and up
If it has a inputs for external sources (iPod), then it'd likely be on the front of the stereo in plain view. Similiar to headphones plug, if not the very same. As far as preamp outputs, those are usually located on the very back of the stereo. Sorry that's all I could tell ya. the input for auxiliary audio or iPod is int the back side of the radio 12 pin plug to fin the correct interface go to Google or yahoo and search for this ( PIE TOY03-AUX TOYOTA 2003-2007 ) you will find the interface and cable the radio is also capable of controlling the iPod and it will display iPod text on the Toyota radio screen there is a small box called hi/low interface that can be use for rca jacs out pie EIS-LOC-T
Radio was released on 10/24/2003.
Your Radio was created on 2003-11-30.
Radio Radio TV Sleep was created on 2003-08-25.
Suicide Radio was created in 2003-11.
The 2003 Toyota Matrix has 16 valves.
The 2003 Toyota Matrix has an inline 4 engine.
The 2003 Toyota Matrix is a gas-powered vehicle.
The 2003 Toyota Matrix has a 5-speed manual.
The 2003 Toyota Matrix is 14 ft. 3.3 in. (171.3 in.) long.
The curb weight of the 2003 Toyota Matrix is 2679 lbs..
The 2003 Toyota Matrix has double overhead cam (DOHC).
The 2003 Toyota Matrix's turning circle is 35.5 ft..
The 2003 Toyota Matrix has a drag coefficient of .32 Cd.
The height of the 2003 Toyota Matrix is 5 ft. 0.6 in. (60.6 in.).
where is the speed sensor located on 2003 Toyota matrix
The 2003 Toyota Matrix runs on regular unleaded.