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

Engine Control Module (ECM)

Scan Tool Output Control

Additional Menu Selection(s)

Description

GEN L-Terminal

ECM, Special Functions, Output Control

The engine control module (ECM) commands the generator OFF when off is selected. The generator will then stop generating an output voltage.

Starter Relay

ECM, Special Functions, Output Control

The ECM commands the starter relay Off and On.

Instrument Panel Cluster (IPC)

Scan Tool Output Control

Additional Menu Selection(s)

Description

Segment Check

Instrument Panel Cluster, Special Function

The instrument panel cluster (IPC) illuminates all indicators to test for an inoperative indicator. The battery indicator is just to the left of the engine indicator.