GM Service Manual Online
For 1990-2009 cars only
Table 1: Body Control Module (BCM)
Table 2: Engine Control Module (ECM) / 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 Voltage Signal

Power Mode

0-15 volts

14 volts

BTSI Solenoid

Chassis Data

ON/OFF

ON

Engine Control Module (ECM) / 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.

Ignition 1 Signal

ECM/PCM, Electrical/Theft Data

Volts

12 Volts

Stoplamp Pedal Switch

PCM, Chassis Data

Applied/Released

Applied

BPP Circuit Signal

ECM, Electrical/Theft Data

Applied/Released

Applied

TR Sw.

ECM, Transmission Data

Park, Reverse, Neutral, Drive 5, Drive 4, Drive 3, Drive 2, Drive 2, Drive 1

Park

TCC Brake Switch

ECM, Transmission Data

ON/OFF

OFF