Instrument Panel Cluster (IPC)

WARNING: This page is about a different car, the 2000 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

Some vehicle systems share data over a serial data line to execute various vehicle functions. Communication between each system is accomplished by sending digitally coded messages, which consist of specific information the system module must follow. Each system module is assigned its own recognition code, so that it can respond to appropriate messages.

Signals that activate the IPC are known as "wake-up" signals. IPC is asleep when it is not controlling or monitoring the following wake-up functions: any activity on serial data line, headlight switch on, courtesy lights on, power mode message received from Body Control Module (BCM), battery disconnection and reconnection, or ignition is turned on. The IPC will enter a sleep state (to reduce parasitic load) when all of the following conditions exist: no activity on serial data line for about 10 seconds, ignition is turned off, headlights are off, courtesy lights are off, power mode message was not received from BCM and SECURITY indicator is not on.