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

Accessory

Volts

12.6 Volts

Engine Control Module (ECM) / 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

Generator F-Terminal

PCM, General Info - Inputs

%

50%

Generator L-Terminal

ECM, General Info - Outputs

Enabled/Disabled

Disabled

Generator L-Terminal

PCM, General Info - Inputs

Active/Inactive

Inactive

Ignition 1

ECM/PCM, General Info - Outputs

Volts

12.6 Volts

Transmission Range

ECM, Transmission Data

Reverse, 2nd, Drive, Park, Neutral, 1st, 3rd

Park

TR Sw.

PCM, Transmission Data

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

Park