Body Control Module (BCM)
WARNING: This page is about a different car, the 2003 Pontiac Sunfire and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
Battery Voltage: Display indicates battery voltage. Measured in volts.
Brake to Shift Relay: Displays indicates ON when the body control module a ground to the automatic transmission shift lock control solenoid A/T shift lock control circuit.
BTSI Output: Display indicates ON when the Brake to Shift Relay is ON.
Ignition 1: Display indicates ON when the ignition 1 input circuit of the module receives a battery signal from the ignition switch.
Park (BTSI) Output Feed: Display indicates ON when the Brake to Shift Relay is ON.