GM Service Manual Online
For 1990-2009 cars only
Table 1: Instrument Panel Cluster (IPC)
Table 2: Powertrain Control Module (PCM) / 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 drives all of the gages at or below minimum for a few seconds when you select ON, then 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.

Segment Check

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.

Powertrain Control Module (PCM) / Engine Control Module (ECM)

Scan Tool Output Control

Additional Menu Selections

Description

GEN L-Terminal

Special Functions

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

Oil Life Reset

Special Functions

The PCM resets the engine oil life to 100 percent and back to the original value when commanded from the scan tool.

Malfunction Indicator Lamp (MIL)

Special Functions

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