Module, Radio Antenna: Operation

WARNING: This page is about a different car, the 2020 Chrysler 300 and 2019 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

The antenna module is powered by a 9 volt output from the Radio Receiver Module (RRM) through the coaxial cable whenever the radio receiver is active. The module receives both AM and FM Radio Frequency (RF) signals supplied by the on-glass antenna grid elements screened onto the inside of the backglass. The capacitor selectively filters Radio Frequency Interference (RFI) from the received signals, while the module amplifies the received signals. The filtered and amplified signal is then sent through the coaxial cable to the RRM AM/FM antenna input.

The hardwired inputs and outputs to the antenna module or the capacitor may be diagnosed using conventional diagnostic tools and procedures. However, the module and capacitor themselves are diagnosed by substituting a known good external antenna to compare reception performance.