MN, I'm not sure about the Cable you mentioned, but the problem seems to be with the IPHONE specifically.
After speaking with PIE and other electronic companies apparently the iphone does not work with cables that are more sophisticated like I have purchased and listed below. So, there are apparently two options that I am aware of if you have an IPHONE: (1) The UNI POD from PIE (
http://www.discountcarstereo.com/detail.aspx?ID=887), or (2) the IC-RCA from PAC (
http://www.keenzo.com/showproduct.asp?M=PACIFIC-ACCESSORY--PAC&ID=1254715&ref=GB). Both allow charging and audio for an IPHONE. I have called both companies and have been ensured these cables will work with the IPHONE. I just ordered the PAC cable and I will post results after installation.
NOTE: these cables above are to be used with any of the cables ( i.e. Becker, PIE, ect) that enable/allow RCA input into our radio.