Lock-Up Solenoid Relay (Tracker A/T)

Battery voltage is supplied to lock-up relay Light Green/Red wire from control relay. Battery voltage is also supplied to lock-up relay through the stoplight switch. Voltage through stoplight switch should drop to zero volts when the brake pedal is depressed. When ECM senses conditions are correct for energizing lock-up solenoid in automatic transmission, ECM will energize lock-up relay by providing a ground. Relay, in turn, energizes lock-up solenoid. When energized, the lock-up solenoid will provide a feedback signal to the ECM, indicating lock-up signal has been received.