For 1990-2009 cars

This section provides an overview of the instrument cluster operation as well as a detailed diagnosis. The instrument cluster serves as the primary interface for the vehicle's driver.

The instrument cluster contains a microprocessor as part of the instrument panel assembly. The instrument cluster performs the following functions:

• | Recognizes operational malfunctions

• | Alerts the driver through indicators

• | Stores DTCs which identify malfunction areas

In order to perform all of these functions, the instrument cluster microprocessor has its own inputs, outputs and program software. The instrument cluster has the capability to diagnose malfunctions in the following components:

• | The sensors

• | The input switches

• | The components

• | The systems the instrument cluster communicates with or controls

When the instrument cluster or another microprocessor-controlled module detects a malfunction, the instrument cluster may turn on an instrument cluster indicator in order to alert the driver that a malfunction has occurred. Some indicator lamps have dual controls.