GM Service Manual Online
For 1990-2009 cars only

Body Control Module (BCM)

Battery Voltage: Display indicates battery voltage. Measured in volts.

Shift Lock Solenoid Command: Displays indicates ACTIVE when the brake switch is depressed on Floor Shift.

Shift Lock Solenoid Command: Displays indicate INACTIVE when the brake switch is depressed on Column Shift.

Ignition 1 Signal: Display indicates ON when the ignition 1 input circuit of the module receives a battery signal from the ignition switch.

Remote Start: Display indicates the current status of the remote start request.

Engine Control Module (ECM)

Current Gear: Displays current gear position of the transmission

TCC Brake Switch: Displays ON or OFF status of the TCC Brake switch.

Reverse Inhibit Solenoid Circuit Status: Displays OK, Incomplete, Short B+, Short Gnd, Open.

Reverse Inhibit Solenoid Command: Displays Not Equipped / ON / OFF

TR Sw. A/B/C/P: Displays LOW or HI for the state of each of the four inputs from the IMS. LOW displayed indicates a low voltage signal (0 volts) being monitored at the ECM. HI displayed indicates a high voltage signal (B+) being monitored at the ECM.