Circuit Operation - Shift Lock Solenoid Operation

The purpose of the Shift Lock Solenoid is to prevent the driver from shifting out of "P" into another gear without first depressing the brake pedal. This is accomplished via the Shift Lock Control Module. Battery voltage is applied to the Shift Lock Control Module through the ECU-IG Fuse and Junction Block 3 when the ignition switch is in the "ON" and "START" positions. The Shift Lock Control Module is permanently grounded at G200 through Junction Block 3 and Junction Connectors 1 and 3. With both power and ground provided, the Shift Lock Control Module will apply voltage and energize the Shift Lock Solenoid, thus unlocking the manual selector lever if the following signals are present simultaneously: a Brake Signal (indicating that the brake pedal is depressed) and a "P" Signal (indicating that the manual selector lever is in the "P" position with the button on the manual selector lever released). The Shift Lock Control Module receives the Brake Signal through the Stoplamp Switch, Junction Block 1 and Junction Block 3 whenever the brake pedal is depressed. The "P" Signal is received through the Shift Lock Control Switch when the manual selector lever is in the "P" position with the button released. The Shift Lock Solenoid is grounded through the Shift Lock Control Module and energizes as soon as voltage is applied. The Shift Lock Solenoid energizes to unlock the button on the manual selector lever. The button on the manual selector lever acts as a mechanical switch, and when depressed, de-energizes the solenoid. The solenoid, however, does not return to the de-energized position, but is held in place mechanically. It is by this that the manual selector lever can be moved from the "P" position.