For 1990-2009 cars

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