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/Vehicle in PARK

Auto Learn Timer

Security Data

Seconds

0-600

Battery 1

Security Data

Volts

Varies

Driver Door Switch

Switch Inputs

Active/Inactive

Inactive (door closed)

Horn Relay Command

Security Data

Active/Inactive

Inactive

Horn Relay Feedback

Security Data

Active/Inactive

Inactive

Ignition 1 Input

Security Data

Active/Inactive

Active

Ignition 2 Input

Security Data

Active/Inactive

Active

Key Learned

Security Data

Numerical

Varies

Key Learn Enable

Security Data

Active/Inactive

Inactive

Passanger Door Switches

Switch Inputs

Active/Inactive

Inactive (Door Closed)

Passlock Input

Security Data

Volts

0.86-5 Volts

Passlock Power Feedback

Security Data

Ignition Off/Tamper/Fail Enable/Fail Enable Dec/Seedkey Lrn Pend/Seedkey Learn/Auto Learn Pend/Learn Passlock/Monitor Passlock/Normal Decision/Auto Learn

Monitor Passlock

Passlock Timer

Security Data

Seconds

Varies

Security LED

Security Data

On/Off/Flashing

Off

Powertrain Control Module (PCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF/Vehicle in PARK

VTD Auto Learn Timer

Engine Data 3

Active/Inactive

Inactive

VTD Fuel Disable

Engine Data 3

Active/Inactive

Inactive

VTD Fuel Disable Until

Engine Data 3

Yes/No

No

VTD Password Learn Enable

Engine Data 3

Yes/No

No