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 COMMUNICATIONS NETWORK - 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 SYSTEM - 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.