Buy Subaru Legacy Automatic Transmission Shift Lock Relays

The automatic transmission shift lock relay, also known as the shift interlock relay or gear shift control relay, is a crucial component in vehicles with automatic transmissions. It ensures safe operation by preventing the gear shift lever from moving out of the "Park" position unless specific conditions are met, such as pressing the brake pedal.

The shift lock relay works in conjunction with the brake pedal and the shift interlock system. When you press the brake pedal, the relay activates the shift lock solenoid, allowing the gear selector to move out of "Park." This safety feature prevents unintentional vehicle movement, reducing the risk of accidents caused by accidental gear engagement.

Over time, the automatic transmission shift lock relay can develop issues due to wear or electrical faults. Common symptoms of a failing shift lock control relay include:

Gear Shift Lever Stuck in Park: The most noticeable sign is an inability to move the gear shift lever from "Park" even when the brake pedal is depressed.
Intermittent Shifting Difficulties: The gear selector may sometimes move out of "Park" and other times remain stuck, indicating an intermittent fault with the shift interlock relay.
No Audible Click When Pressing Brake Pedal: Normally, a faint click is heard when the brake pedal is pressed as the relay and shift lock solenoid engage. Lack of this sound may suggest a problem with the gear shift interlock relay.
Brake Lights Malfunctioning: Electrical issues with the relay may cause brake lights to malfunction, such as staying on continuously or not illuminating when the pedal is pressed.

Proper maintenance can extend the life of the shift lock relay and ensure the shift interlock system operates smoothly:

Regular Electrical Inspections: Check for loose or corroded electrical connections related to the shift lock control relay.
Brake System Checks: Ensure the brake light switch is functioning correctly, as it signals the relay to unlock the gear shift lever.
Avoid Forcing the Gear Shift Lever: Forcing the shift lever when it's stuck can damage the gear shift mechanism and related components.
Listen for Normal Operation Sounds: Pay attention to the usual sounds of the shift lock system when operating the vehicle to detect any anomalies early.

If replacing the automatic transmission shift lock relay, follow these guidelines:

Refer to Vehicle Specifications: Consult the vehicle's service manual for precise instructions on locating and replacing the shift interlock relay.
Safety Precautions: Disconnect the battery before starting to prevent electrical hazards.
Use Compatible Parts: Install a shift lock relay that matches the specifications for your vehicle's make and model.
Verify Installation: After replacement, test the shift interlock system to ensure the gear selector moves correctly when the brake pedal is pressed.

Being familiar with components related to the shift lock control relay can aid in troubleshooting:

Shift Lock Solenoid: Engages and disengages the physical locking mechanism of the gear shift lever.
Brake Light Switch: Triggers the relay when the brake pedal is pressed.
Ignition Switch: Works with the shift interlock system to ensure the vehicle is started before shifting gears.
Gear Shift Assembly: Includes the gear selector and associated mechanical parts.