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

Engine Special Functions

Command the generator L terminal ON and OFF.

Starter Relay Control

Engine Special Functions

Commands the starter relay ON and OFF.

Instrument Panel Cluster (IPC)

Scan Tool Output Control

Additional Menu Selection(s)

Description

Display(s) Test

Engine Special Functions

The instrument panel cluster (IPC) illuminates all indicators to test for an inoperative indicator.