Description & Operation: Introduction

WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

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

A/T shift lock control solenoid.
A/T shift lock control switch (stoplamp switch).
Park/Neutral Position (PNP) switch.

With the ignition switch in the ON position, battery positive voltage is supplied to the PNP switch. With the transmission in the Park position, the contacts in the PNP switch are closed. This allows current to flow through the switch to the stoplamp switch. The circuit continues through the normally closed switch to the A/T shift lock control solenoid. The A/T shift lock control solenoid is permanently grounded. This energizes the A/T shift lock control solenoid, locking the shift linkage in the Park position. When the driver presses the brake pedal the contacts in the stoplamp switch open, causing the A/T shift lock control solenoid to de-energize. This allows the shift lever to move from the Park position.