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

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, Power Mode

0-15 volts

12 volts

Brake Lamp Cmd.

BCM, Chassis Data

ON/OFF

ON

BTSI Solenoid

BCM, Chassis Data

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.

Ignition 1 Signal

ECM, Engine Data

Volts

12 V

IMS

Transmission Data

Invalid, Drive 3\Drive 2, Drive 2, Reverse\Neutral, Neutral, Drive 5, Park\Reverse, Park, Drive 3, Reverse, Park\Reverse, Drive 5\Drive 4, Drive 4

Park

Table 1: Body Control Module (BCM)
Table 2: Engine Control Module (ECM)/Powertrain Control Module)

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, Power Mode

0-15 volts

12 volts

Brake Lamp Cmd.

BCM, Chassis Data

ON/OFF

ON

BTSI Solenoid

BCM, Chassis Data

On/Off

Off

Engine Control Module (ECM)/Powertrain 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.

Ignition 1 Signal

ECM, Engine Data

Volts

12 V