Principles of Operation: Notes
NOTE:
The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).
NOTE:
When installing a new Instrument Cluster (IC), it is necessary to upload the module configuration to the scan tool. Following installation of the IC, download the module configuration from the scan tool into the new IC. Refer to
MODULE CONFIGURATION
to carry out Programmable Module Installation (PMI). It is also necessary to carry out a parameter reset procedure whenever a new IC or PCM is installed. Refer to
ANTI-THEFT - PASSIVE ANTI-THEFT SYSTEM (PATS)
.
The IC utilizes a microprocessor to control the gauge, indicator, message center and warning chime functions. Data is sent to the IC 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 IC 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.