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

Electronics Battery Fd

Data

Volts

12.6 Volts

Ignition 0

Data

Volts

12.6 Volts

Ignition 0

Input

Active, Inactive

Active

Ignition 1

Input

Active, Inactive

Active

Ignition Accessory

Input

Active, Inactive

Active

Park/Neutral Switch

Input

Active, Inactive

Active

Engine Control Module (ECM) 3.6L (LY7)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF

Crank Request Signal

Electrical/Theft Data

Yes/No

No

GEN F-Terminal Signal

Electrical/Theft Data

%

0%

GEN L-Terminal Signal Command

Electrical/Theft Data

On/Off

Off

Ignition 1 Signal

Electrical/Theft Data

On/Off

Off

Starter Relay Circuit History

Electrical/Theft Data

OK/Fault/Indeterminate

OK

Starter Relay Command

Electrical/Theft Data

On/Off

Off

Powertrain Control Module (PCM) 3.5L (LX9)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF

Crank Request Signal

Electrical/Theft Data

Yes/No

No

GEN F-Terminal Signal

Electrical/Theft Data

%

0%

GEN L-Terminal Signal Command

Electrical/Theft Data

On/Off

Off

Ignition 1 Signal

Electrical/Theft Data

Volts

12.6 Volts

Starter Relay Circuit History

Electrical/Theft Data

OK/Open/Short/Invalid State

OK

Starter Relay Command

Electrical/Theft Data

On/Off

Off