GM Service Manual Online
For 1990-2009 cars only

Body Control Module (BCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF

Battery Voltage

Data

Volts

Varies

Ignition 0

Inputs

On/Off

On

Ignition 1

Inputs

On/Off

On

Ignition 3

Inputs

On/Off

On

Ignition Accessory

Inputs

Active/Inactive

Active

Key in Ignition

Inputs

Yes/No

Yes

SWC Switch Voltage

Data

Volts

0.0

SWC Switch Power

Outputs

On/Off

On