Indicators, Instrument Cluster: Operation: Operation: Notes
Indicators are located in various positions within the instrument cluster display and are all connected to the electronic circuit board of the instrument cluster, also known as the Cab Compartment Node or (CCN). Some indicators operate based upon hard-wired inputs to the CCN, but most are controlled by Controller Area Network (CAN) or LIN data bus messages from other electronic modules in the vehicle. Some are controlled by a combination of hard-wired inputs, electronic messaging and CCN programming. If the CCN loses CAN data bus communication, the CCN circuitry will automatically turn ON the Malfunction Indicator Lamp (MIL) until CAN data bus communication is restored.
The various CCN indicators are controlled by different strategies; some receive fused ignition switch output from the CCN circuitry and have a switched ground, while others are grounded through the CCN circuitry and have a switched battery feed. However, all indicators are completely controlled by the CCN microprocessor based upon various hard-wired and electronic message inputs. The cruise indicator located within the odometer VFD unit is dimmable. All other indicators are illuminated at a fixed intensity, which is not affected by the selected illumination intensity of the CCN general illumination Light Emitting Diode (LED) units. The illumination intensity of the dimmable indicators is synchronized with that of the general illumination lighting.
In addition, certain indicators in this instrument cluster are automatically or self-configured. This feature allows the configurable indicators to be enabled by the CCN circuitry for compatibility with certain optional equipment. These indicators are enabled or disabled by an electronic configuration message sent to the CCN by the TIPM. The TIPM defaults for the ABS indicator and airbag indicator are enabled, and these configuration settings must be programmatically disabled in the TIPM using a diagnostic scan tool for vehicles that do not have this equipment. The automatically or self-configured indicators remain latent in each CCN at all times and will be active only when the CCN receives the appropriate CAN or LIN bus message inputs for that optional system or equipment.
The hard-wired indicator inputs may be diagnosed using conventional diagnostic tools and procedures. However, the CCN circuitry and electronic CAN or LIN data bus message controlled indicators are diagnosed using the self-diagnostic test. Refer to DIAGNOSIS AND TESTING . Proper testing of the CAN or LIN data bus and the electronic data bus message inputs to the CCN that control each indicator requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information. Specific details of the operation for each indicator may be found elsewhere in this service information.