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 1

BCM, Switch Inputs

Volts

12.6 Volts

Powertrain Control Module (PCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF/Clutch Depressed or Transmission in Park or Neutral

Crank Request Signal

Engine Data Display, Electrical/Theft Data

Yes/No

No

Generator L-Terminal Signal Command

Engine Data Display, Electrical/Theft Data

On/Off

Off

Ignition 1 Signal

Engine Data Display, Electrical/Theft Data

Volts

12.6 Volts

Starter Relay Command

Engine Data Display, Electrical/Theft Data

On/Off

Off

TR Sw.

Transmission Data

Invalid, Neutral, Drive, Park, Low, Reverse, Intermediate

Park