GM Service Manual Online
For 1990-2009 cars only
Table 1: ECM
Table 2: IPC

ECM

Scan Tool Output Control

Additional Menu Selection(s)

Description

GEN L-Terminal

Engine, Special Functions

Commands the generator L terminal On and Off.

Starter Relay Control

Engine, Special Functions

Commands the starter relay ON and OFF.

IPC

Scan Tool Output Control

Additional Menu Selection(s)

Description

Display Test

I/P Special Functions

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