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

Dimming Intensity

Special Functions

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

Display Test

Special Functions

The IPC illuminates all indicators and drives all of the gages at or above maximum for a few seconds. The IPC Display Test will end after one cycle of the gages sweep and indicator illumination.

Segment Check

Special Functions

The IPC illuminates all segments of the driver information center when you select ON.

Engine Control Module (ECM)

Scan Tool Output Control

Additional Menu Selections

Description

GEN L-Terminal

Special Functions

The engine control module (ECM) commands the generator OFF when off is selected from the scan tool. The generator stops generating an output voltage.

Malfunction Indicator Lamp (MIL)

Special Functions

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