Car radio/Stereo ECU unit/Antenna

[flyingdutchie]

I am now busy inside the car. I've found 2 antenna cables. One coming out of the loom with a thin red wire to it. Another one (seem after market), also with a little red wire to it, going through the body on the passenger side where the water tank is.

Question about the stereo ECU. My car had the center speaker. Not anymore. But, what is the use of this ECU? I have my door speakers connected directly to the radio. This leaves only a function for the rears?

[flyingdutchie]

Great. Thanks. The aftermarket antenna isn't going through the bulkhead, but is placed afterwards and goes to the back of the roof inside the car. Where (i think the immobiliser console is.