Principles of Operation: Notes

The instrument cluster is a hybrid electronic cluster (HEC) which receives and outputs information using both hardwired circuitry and the controller area network (CAN) communication circuits.

It is very important to understand:

• Where the input originates from.
• All the information necessary for a feature to operate.
• Which module(s) receive(s) the input or command message.
• If the module that received the input controls the output of the feature, or if it sends a message over the CAN to another module.
• Which module controls the output of the feature.

The instrument cluster carries out a prove-out when the ignition switch is turned from the OFF to the RUN position to verify the integrity of the warning indicators. The charging system warning indicator, the low oil pressure warning indicator and the malfunction indicator lamp (MIL) illuminate when the ignition switch is turned to the ON position, and then turn off when the engine is started and running normally. The seat belt warning indicator proves-out for 60 seconds and then turns off, or turns off when the seat belt is fastened. The following indicators prove-out when the ignition switch is turned to the ON position:

• Door ajar warning indicator (3 seconds)
• Anti-lock brake system (ABS) warning indicator (3 seconds)
• O/D OFF indicator (3 seconds)
• Air bag warning indicator (6 seconds)
• Brake warning indicator (3 seconds)
• Door ajar warning indicator (3 seconds)
• Shift up indicator (3 seconds)
• Low fuel warning indicator (3 seconds)
• Traction control indicator (3 seconds)
• Check fuel cap indicator (3 seconds)
• Passive anti-theft system (PATS) indicator (3 seconds)