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

IPC Gauge Sweep Test

Special Functions

The instrument panel cluster (IPC) drives all of the gages at or above maximum for a few seconds when you select ON, then drives all of the gages at or below minimum for a few seconds. The IPC Display Test will end after one cycle of the gage sweep.

Displays Test

Special Functions

The IPC illuminates all of the indicators for 7 seconds when you select ON. The IPC turns off the indicators after the 7 seconds.

Dimming

Special Functions

The DIC and the PRNDL display segments turn ON and OFF when commanded from the scan tool.

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 MIL indicator ON and OFF.