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

BCM Data

0-15 volts

14 volts

BTSI Solenoid

BCM 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

Volts

12 Volts

Stoplamp Pedal Switch

ABS, ECM/PCM

Applied/Released

Applied

TR Sw. A/B/C/P

Transmission Data

Park, Park/Reverse, Reverse, Reverse/Neutral, Neutral, Neutral/Drive 4, Drive 4, Drive 4/Drive 3, Drive 3, Drive 3/Drive 2, Drive 2, Drive 2/Drive 1, Drive 1, Invalid, Open

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TCC Brake Switch

Transmission Data

ON/OFF

OFF