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

Starter Relay Control

Engine Special Functions

Commands the starter relay On and OFF.

IPC

Scan Tool Output Control

Additional Menu Selection(s)

Description

Data Display

Engine Special Functions

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