Principles of Operation

PRINCIPLES OF OPERATION

The instrument cluster (IC) is a configurable, hybrid electronic cluster (HEC) that contains a microprocessor, gauges, indicator lamps, and internal circuitry. The instrument cluster (IC) uses hardwired circuitry, the standard corporate protocol (SCP), and the controller area network (CAN) to transmit and receive data from other modules.

When installing a new instrument cluster (IC), it is necessary to upload the module configuration information to the scan tool. Following installation of the instrument cluster (IC), download the module configuration information from the scan tool into the new instrument cluster (IC). Refer to Information Bus (Module Communications Network) to carry out programmable module installation (PMI). Programming and Relearning

It is very important to understand:
- where the input originates.
- all the information necessary in order for a feature to operate.
- which module(s) receive(s) the input or command message.
- whether the module which received the input controls the output of the feature, or whether it outputs a message over the SCP or the CAN circuits to another module.
- which module controls the output of the feature.

The following items are configurable:
- Gulf coast countries (GCC) destination
- Traction control
- Oil life threshold
- Oil minder off
- PCM oil life used
- Engine idle hour meter
- Back up aid
- Air suspension
- Belt-Minder(R)

Instrument Cluster (IC) Network Messages

NOTE: Whenever a network message is suspected as missing and confirmed by a missing message DTC (U-code), it is important to look for other symptoms that may also be present in the instrument cluster (IC) and throughout the vehicle. Once a DTC is set in the instrument cluster (IC), it may be helpful to review the complete message list available in Information Bus (Module Communications Network) to see what other modules also rely on the same message and run the self-test for those modules. If the message is missing from other modules, the same DTC may also be set in those modules. Confirmation of missing messages common to multiple modules may indicate that the originating module is the source of the concern or the communication network may be experiencing some problems.

The instrument cluster (IC) uses input messages from other modules to control the gauges, informational indicators and warning indicators over the communication networks. If a required message is missing or indicator that requires the message remains at the last commanded state based upon the last known good message.

Instrument Cluster (IC) Prove-Out
The instrument cluster (IC) and other vehicle modules carry out a display prove-out to verify that all module controlled warning/indicator lamps and monitored systems are operating correctly. When the ignition switch is turned to the ON position with the engine off, the indicators illuminate to prove-out according the following table: