Information and Message Center

Instrumentation, Message Center and Warning Chimes

Principles of Operation

NOTE: The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).

NOTE: When installing a new Instrument Panel Cluster (IPC), it is necessary to upload the module configuration to the scan tool. Following installation of the IPC, download the module configuration from the scan tool into the new IPC. Refer to Information Bus to carry out the Programmable Module Installation (PMI). It is also necessary to carry out a parameter reset procedure whenever a new IPC or PCM is installed. Refer to Antitheft and Alarm Systems. Programming and Relearning Passive Anti-Theft System (PATS)

The IPC utilizes a microprocessor to control the gauge, indicator, message center and warning chime functions. Data is sent to the IPC over the Medium Speed Controller Area Network (MS-CAN) and the High Speed Controller Area Network (HS-CAN) bus lines and through hardwired circuitry from individual components. The IPC uses each input to output an action to the gauges or indicators.

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.
- does the module which received the input control the output of the feature, or does it output a message over the communication network to another module.
- which module controls the output of the feature.

Information And Message Center

The message center is an integral part of the IPC that receives and acts upon much of the same information that is input and used to operate the IPC gauges, informational indicators, message center indicators, warning indicators and warning chimes. The message center is a 2-line display located in the center of the IPC. The message center functions use both hardwired circuitry, and the Controller Area Network (CAN) to display information.