This section provides an overview of the instrument cluster
(IPC) operation as well as detailed diagnoses. The IPC serves as the primary
vehicle interface of the driver.
The IPC contains a microprocessor as part of the instrument panel assembly.
The IPC performs the following functions:
| • | Recognizes operational malfunctions. |
| • | Alerts the driver through indicators or driver information center
(DIC) messages. |
| • | Stores diagnostic trouble codes (DTCs) which identify malfunctions
to the service technician. |
In order to perform all of these functions, the IPC microprocessor has
inputs, outputs, and software. The IPC has the capability to diagnose malfunctions
in the following components with which the IPC communicates:
When the IPC or another microprocessor controlled module detects a malfunction,
the IPC may turn on an IPC indicator or direct a display request to the DIC
in order to alert the driver that a malfunction has occurred. Some of the
indicator lamps and IPC messages have dual controls.
