Principles of Operation: Notes

The instrument cluster is a hybrid electronic instrument cluster (HEC). The instrument cluster and the smart junction box (SJB) use a combination of hardwired circuitry, the standard corporate protocol (SCP), and the controller area network (CAN) communication circuits to transmit and receive information. 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 communication network to another module.
• which module controls the output of the feature.

When installing a new instrument cluster, it is necessary to upload the module configuration to the diagnostic tool. Following installation of the instrument cluster, download the module configuration from the diagnostic tool into the new instrument cluster. For additional information, refer to MODULE CONFIGURATION . The following items are configurable:

• safety belt minder
• tire pressure monitoring system (TPMS) configuration
• overspeed warning
• enhanced door ajar warning display
• overhead display
• speedometer bias
• default language
• oil life
• oil life status and warning

Each time the ignition switch is turned from the OFF to the ON position, the charging system indicator, the low oil pressure indicator and the malfunction indicator lamp (MIL) prove out and remain on until the engine is started and operating normally. The safety belt warning indicator proves out for 65 seconds, or turns off when the safety belt is buckled. The air bag indicator proves out for approximately 6-8 seconds while the following instrument cluster indicators and warning indicators prove out for approximately 3 seconds:

• ABS warning indicator
• low tire pressure warning indicator
• lamp out (base cluster only)
• door ajar (base cluster only)
• low fuel
• BRAKE system
• traction control
• check fuel cap
• transmission malfunction
• low washer fluid level (base cluster only)
• failsafe cooling warning indicator (base cluster only)
• electric steering malfunction (base cluster only)