Remote Switch: Description and Operation

OPERATION

The six switches in the two remote radio switch units are normally open, resistor multiplexed momentary switches that are hard wired to the Cab Compartment Node (CCN) through the clockspring. The CCN sends a five volt reference signal to both switch units on one circuit, and senses the status of all of the switches by reading the voltage drop on a second circuit.

When the CCN senses an input (voltage drop) from any one of the remote radio switches, it sends the proper switch status messages on the Controlled Area Network (CAN) to the radio receiver. The electronic circuitry within the radio receiver is programmed to respond to these remote radio switch status messages by adjusting the radio settings as requested. For diagnosis of the CCN or the CAN data bus, the use of a scan tool and the proper Diagnostic Procedures manual are recommended.