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

When the ignition switch is turned to ON, ignition positive voltage is supplied from the ignition switch to the park relay coil in the rear fuse block. Battery positive voltage is supplied at all times to the park relay switch. The powertrain control module (PCM) monitors the park/neutral position switch to determine the position of the gear shifter. When the gear shifter is in PARK, the PCM sends a Class 2 message to therear integration module (RIM). The RIM energizes the park relay by grounding the control circuit of the park relay. With the park relay energized, battery positive voltage is provided from the NSBU fuse in the rear fuse block through the contacts of the park relay and the normally-closed stoplamp/automatic transmission shift lock control switch to the automatic transmission shift lock control solenoid. The automatic transmission shift lock control solenoid, which is permenently grounded, then energizes, locking the shift lever in the PARK position. Pressing the brake pedal opens the contacts of the stoplamp/automatic transmission shift lock control switch, removing power from the automatic transmission shift lock control solenoid. The solenoid de-energizes, allowing the driver to move the shift lever out of the PARK position.

When the driver moves the shift lever out of the PARK position the PCM sends a Class 2 message to the RIM. The RIM de-energizes the park relay which disables the automatic transmission shift lock control solenoid. The automatic transmission shift lock control system remains disabled until the shift lever is moved back to the PARK position.

The reverse lockout system prevents the console mounted shift lever from being inadvertently shifted into REVERSE, while the vehicle is moving over 5 mph for 15 seconds or longer with the igniton ON.The reverse lockout system consist of the following components:

With the ignition in the ON position, battery positive voltage is supplied the HVAC fuse to the battery positive voltage circuit of the reverse lockout solenoid. When the dash integration module (DIM) determines that the ignition is in the ON position and vehicle speed is greater than 5 mph for 15 seconds. The DIM grounds the control circuit of the reverse lockout solenoid. When energized, a mechanical pin on the reverse lockout solenoid is moved to the outward position. The pin provides a physical stop on the console shifter, preventing movement of the shift lever into REVERSE or PARK.