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

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 Display, Power Mode

Volts

12 Volts

Shift Lock Solenoid Command

BCM, Data Display, Chassis Data

Lock/Unlock

Lock

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, Electrical/Theft Data

Released/Applied

Released

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.

IMS

TCM, Data Display, Transmission Data

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

Park

TCC Brake Switch

TCM, Data Display, Transmission Data

Open/Closed

Closed

TR Sw.

TCM, Data Display, Transmission Data

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

Park