Column Shift

The system consists of the following components:

• The park relay.
• The A/T shift interlock solenoid.
• The stoplamp switch.
• The rear integration module (RIM).
• The powertrain control module (PCM).

With the ignition ON, positive voltage is supplied from the ignition switch to the coil side ignition feed circuit of the park relay. The RIM receives a gear position input signal from the PCM through a class 2 serial data message. When the RIM receives a PARK position message from the PCM, the RIM applies a ground to the control circuit of the park relay. This energizes the relay, closing the switch contacts in the relay. Battery voltage flows through the relay to the stoplamp switch. With the brake pedal released, voltage flows through the normally closed contacts of the stoplamp switch to the A/T shift interlock solenoid. The A/T shift interlock solenoid is permanently grounded. This energizes the A/T shift interlock solenoid, mechanically locking the shift lever in the PARK position.

When the driver presses the brake pedal, the contacts of the stoplamp switch open, de-energizing the A/T shift interlock solenoid. This allows the shift lever to be moved out of the PARK position. When the shift lever is moved out of the PARK position, the PCM sends a class 2 serial data message to the RIM. The RIM then opens the ground path of the park relay control circuit, de-energizing the park relay and disabling the A/T shift interlock solenoid. Once the vehicle is out of PARK, the A/T shift interlock solenoid remains de-energized until the RIM receives a PARK signal from the PCM.