GM Service Manual Online
For 1990-2009 cars only
Table 1: Instrument Panel Cluster (IPC)
Table 2: Engine Control Module (ECM)

Instrument Panel Cluster (IPC)

Scan Tool Output Control

Additional Menu Selections

Description

Display Test

Special Functions

The instrument panel cluster (IPC) illuminates all indicators when ON is selected for a few seconds and turns OFF after a few seconds or when OFF is selected.

DIC All Segment Test

Special Functions

The IPC illuminates all of the driver information center (DIC) segments and turns OFF all DIC segments after a few seconds or when OFF is selected

Dimming

Special Functions

The IPC increases or decreases the dimming intensity in increments of 20 percent between a range of 0-100 percent.

IPC Gage Sweep Test

Special Functions

The IPC drives all the gages at or above maximum for a few seconds when ON is selected and then drives all the gages at or below minimum after a few seconds or when OFF is selected

Engine Control Module (ECM)

Scan Tool Output Control

Additional Menu Selections

Description

Special Functions

Malfunction Indicator Lamp (MIL)

The engine control module ECM commands the malfunction indicator lamp (MIL) indicator ON and OFF.