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

Load Shed

Inputs

None/Load 1//Load 2/Load 3

None

Inadvertent Power Relay

Outputs

On/Off

Off

Load Management Relay

Outputs

On/Off

Off

Powertrain Control Module (PCM 3.4L LA1)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF

Crank Request Signal

Engine Data 2

Yes/No

No

GEN F-Terminal Signal

Engine Data 2

%

0%

GEN L-Terminal Signal Command

Engine Data 2

On/Off

Off

Ignition 1 Signal

Engine Data 1

Volts

12.6 Volts

Starter Enable Relay Circuit Status

Output Driver Data

Fault/OK/Invalid State

OK

Starter Relay Command

Engine Data 2

On/Off

Off

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

Volts

12.6 Volts

Starter Relay Command

Electrical/Theft Data

On/Off

Off