Description & Operation: Introduction

The automatic transmission shift lock control system is a safety device that prevents an inadvertent shift out of Park when the engine is running. The driver must press the brake pedal before moving the shift lever out of the Park position. The system consists of the following components:

• Body Control Module (BCM)
• Powertrain Control Module (PCM)
• Park/Neutral Position (PNP) Switch
• Stoplamp Switch
• Brake Transmission Shift Interlock (BTSI) Solenoid