GM Service Manual Online
For 1990-2009 cars only

BCM must be properly powered

Scan Tool Parameter

Units Displayed

Typical Data Value

Battery Power 2

Present/Not Present

Present

Battery Power 3

Present/Not Present

Present

Ground 2

Present/Not Present

Present

Ignition 0

Inactive/Active

Varies

Ignition 1

Inactive/Active

Varies