Remote Switches: Operation
WARNING: This page is about a different car, the 2004 Dodge Dakota and 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
The remote radio switches are resistor multiplexed units that are hard wired to the high-line Central Timer Module (CTM) through the clockspring. The CTM monitors the status of the remote radio switches and sends the proper switch status messages on the Programmable Communications Interface (PCI) data bus network to the radio receiver. The electronic circuitry within the radio is programmed to respond to these remote radio switch status messages by adjusting the radio settings as requested.