Why Do You Need An Amp Bypass Cable To Fit An Aftermarket Stereo?

[LexusLegend]

Want to ensure I require one before purchasing.

Thanks in advance.

[lexdavis]

well i think if u have an SE or Sport u need one not sure for the S

but to say it simply the connections from the amp will only fit the standard head unit so to fit an aftermarket unit you need the amp bypass cable so it will take the normal connections for headunits

theres plenty of threads on here about it so just use the search