GM Service Manual Online
For 1990-2009 cars only
Table 1: Body Control Module
Table 2: Engine Control Module (ECM)
Table 3: Transmission Control Module (TCM)

Body Control Module

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.

Shift Lock Solenoid Command

BCM, Data Display, Outputs

ON / OFF

ON

Engine Control Module (ECM)

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.

BPP Circuit Signal

ECM, Data Display, Electrical/Theft Data

Applied, Released

Released

Ignition 1 Signal

ECM, Data Display, Electrical/Theft Data

Volts

12 v

PNP Switch

ECM, Data Display, Electrical/Theft Data

In Gear, Park/Neutral

Park/Neutral

Transmission Control Module (TCM)

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.

Ignition Voltage

Transmission Data

Volts

0-25v

IMS

Transmission Data

Invalid, Drive 2, Reverse\Neutral, Neutral, Drive 6, Neutral\Drive 6, Park, Drive 3, Reverse, Park\Reverse, Drive 4

Park

TCC Brake Switch

Transmission Data

Closed, Open

Closed