Description And Operation: Operation

The audio amplifier receives fused battery current from a fuse in the front Power Distribution Center (PDC) and is grounded through a circuit of the body wire harness that is secured to the body sheet metal at all times. The internal circuitry of the amplifier switches the amplifier ON or OFF based upon electronic messages that are received over the Controller Area Network - Chassis (CAN-C) data bus from the Entertainment Telematics Module (ETM) whenever the ETM is turned ON.

The amplifier receives analog sound signal inputs from the front and rear, left and right outputs of the Radio Receiver Node (RRN), then provides the amplified speaker outputs for each of those channels to the appropriate speakers through dedicated audio output circuits. The amplifier also receives electronic messages from the Body Control Module (BCM), ETM and the RRN over the CAN-C data bus that communicate the correct channel settings for optimum speaker sound and output.

The hard wired circuits between components related to the amplifier 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 REMOVAL , and INSTALLATION .

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the amplifier or the electronic controls and communication between modules and other devices that provide some features of the audio system. The most reliable, efficient and accurate means to diagnose the amplifier or the electronic controls and communication related to audio system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.