Description And Operation: Operation

The switches in the remote radio switch unit are normally open, resistor multiplexed momentary switches that are hard wired to the Body Control Module (BCM) through the steering wheel wire harness and the clockspring on the steering column. The BCM reads the remote radio switch inputs then sends the appropriate electronic messages to the Radio/Entertainment Telematics Module (ETM) over the Controller Area Network - Interior High Speed (CAN-IHS) data bus to invoke the requested command.

The hardwired circuits between the remote radio switches and the BCM may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds. For proper wire repair, and connector repair procedures. Refer to STANDARD PROCEDURE . and. Refer to REMOVAL . Refer to INSTALLATION .

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the remote radio switches or the electronic communication between modules that provide the features of the remote radio switches. The most reliable, efficient and accurate means to diagnose the remote radio switches or the electronic communication related to remote radio switch operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.