GM Service Manual Online
For 1990-2009 cars only
Table 1: Body Control Module (BCM)
Table 2: Powertrain Control Module (PCM)

Body Control Module (BCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON, with the engine OFF. Transmission shift lever in the PARK position.

Battery 1

BCM, Switch Inputs

Volts

12 Volts

TR Sw.

BCM, Switch Inputs

Reverse, Intermediate, Drive, Park, Neutral, Low

Park

Shifter Unlock Fdbk

BCM, Accessory

Low/High

Low

Powertrain Control Module (PCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON, with the engine OFF. Transmission shift lever in the PARK position.

Brake Switch

Transmission Data

Released/Applied

Released