GM Service Manual Online
For 1990-2009 cars only

Body Control Module (BCM)

Scan Tool Parameter

Units Displayed

Typical Data Value

Operating Conditions: Ignition in RUN Position, Engine OFF, All Doors CLOSED, DRLs OFF

A/C Switch

On/Off

Varies

Battery 1

Volts

Varies

Rear Defog Relay Cmd

On/Off

Off

Rear Defog Switch Input

On/Off

Off