GM Service Manual Online
For 1990-2009 cars only

Body Control Module

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Battery power is the only requirement for Module Information, Inputs and Lock Outputs. Key ON is required for window outputs.

Ignition Voltage

Data

9.0-15.0 Volts

12.8 Volts

Ignition Status

Data

On / Off

Varies

Ignition Accessory

Data

On / Off

Varies

Accessory Relay Command

Data

On / Off

Varies

Passenger Door Status

Data

Open / Close

Varies

Passenger Door Unlock Input

Data

Active / Inactive

Varies

Passenger Door Unlock Relay

Data

On / Off

Off

Passenger Window UP Switch

Data

Active / Inactive

Inactive

Passenger Window Down Switch

Data

Active / Inactive

Inactive

Passenger Window Down Relay

Data

On / Off

Off after relay timeout

Driver Door Status

Data

Open / Close

Varies

Driver Door Unlock

Data

Active / Inactive

Varies

Driver Door Unlock Relay

Data

On / Off

Off

Driver Window Up Switch

Data

Active / Inactive

Inactive

Driver Window Down Switch

Data

Active / Inactive

Inactive

Driver Window Down Relay

Data

On / Off

Off after relay timeout