After install on AVIC-Z120BT was having reception problems. Very little signal strength. No signal displayed, SEEK woundn't find any channels, no AM reception not even noise. Checked for good ground, antenna connection, etc. to no avail. Decided to plug radio directly into car antenna without the extension provided with the radio. Voila, full signal strength, SEEK works as expected, Am stations found. Don't know if it hepls Anaolg/Digital swaping as described elsewhere here, no HD stations here, but it doesn't improve quality of analog stations which IMHO is substandard, especially compaired to the HU. Obviuosly they didn't inspect the provided extension or they wouldn't have been able to fill all the FM memory slots with what appear to be LA radio stations.

 

Hope this helps anyone having similar problems.