Grand Caravan FWD V6-3.8L VIN L (2001)
The Brake/Transmission Shift Interlock (BTSI) Solenoid prevents the transmission shift lever from being moved out of PARK (P) unless the brake
pedal is applied. The BTSI solenoid is hard wired to and controlled by the Intelligent Power Module (IPM). Battery voltage is applied to one side of
the solenoid with the ignition key is in either the ON/RUN or START positions (Fig. 306). The ground side of the solenoid is controlled by a driver
within the IPM. It relies on voltage supplied from the stop lamp switch to the stop lamp sense circuit within the IPM to tell when the brake pedal is
depressed. When the brake pedal is depressed, the ground circuit opens, de-energizing the solenoid. When the brake pedal is released, the ground
circuit is closed, energizing the solenoid.
