Strattec 4-Button Remote Head Key (FCC ID GQ4-52T) – TOY43 Blade

Programming a Strattec 5-Button Smart Key Fob (FCC ID NBG009768T) – Full G 4-Button Remote Head Key (FCC ID GQ4-52T) demands diagnostic tool access to the vehicle’s immobilizer module before the transponder and remote functions can be enrolled. The procedure begins with reading the vehicle’s security data through the OBD-II port, followed by registering the ID74-H transponder chip embedded in the key head. Once the immobilizer accepts the chip, the technician moves on to enrolling the four-button remote section, which operates at 315 MHz. A Strattec 4-Button Remote Head Key (FCC ID GQ4-52T) that has been enrolled correctly will start the engine on first turn and lock, unlock, open the trunk, and trigger the panic alarm from typical remote range. Locksmiths cutting this unit must use the TOY43 keyway profile, a high-security mechanical blade common across several Toyota platforms. The Strattec 4-Button Remote Head Key (FCC ID GQ4-52T) is currently offered as a commercially available aftermarket replacement, giving independent shops a cost-effective alternative to dealer-only sourcing.

Technical Specifications of the Strattec 4-Button Remote Head Key (FCC ID GQ4-52T)

This remote head key integrates both mechanical ignition functionality and electronic remote entry into a single housing. The transponder side uses an ID74-H chip, which is the designation for Toyota’s “H”-type immobilizer generation. Unlike proximity-based smart keys, this unit requires physical insertion into the ignition cylinder. The TOY43 blade must be precision-cut on a code machine or duplicated from an existing working key using a laser or standard key cutter calibrated for the profile.

The remote operates at 315 MHz, the standard frequency for Toyota vehicles sold in the North American market. Four buttons are present on the head: lock, unlock, trunk release (or hatch release depending on the vehicle), and panic. The FCC ID GQ4-52T identifies this specific remote configuration in the FCC’s equipment authorization database, confirming its compliance with Part 15 radio emission standards.

Vehicle Fitment Guide

This key is validated for the following Toyota models and year ranges:

• Toyota Highlander — 2013 through 2019
• Toyota RAV4 — 2012 through 2018
• Toyota Sequoia — 2008 through 2022
• Toyota Tacoma — 2016 through 2023
• Toyota Tundra — 2007 through 2021

The broad year-range coverage, particularly for the Sequoia (15 model years) and Tundra (15 model years), reflects Toyota’s practice of maintaining consistent immobilizer and remote architectures across production runs. Still, verifying by VIN before cutting and programming is essential — certain trim levels or mid-cycle updates can introduce variations in immobilizer hardware that affect chip compatibility.

ID74-H Transponder and Immobilizer Considerations

The ID74-H transponder belongs to Toyota’s “H”-generation immobilizer system, which introduced enhanced cryptographic handshake protocols compared to earlier “G”-chip keys. From a locksmith’s standpoint, the key difference between G-chip and H-chip programming lies in the seed-key exchange process during registration. Diagnostic platforms such as the Autel IM608 Pro, Smart Pro, and similar advanced key programmers support ID74-H enrollment, though the exact procedure varies by software version and the specific vehicle model being serviced.

One practical consideration: the ID74-H chip inside this remote head key must be registered to the vehicle’s ECU before the mechanical blade will start the engine, even if the blade is cut perfectly. This is a common point of confusion for vehicle owners who assume a correctly cut key should work immediately. Without transponder enrollment, the immobilizer will block fuel injection and ignition.

Cutting the TOY43 Blade

The TOY43 keyway is a standard-depth, single-sided profile used across a wide segment of Toyota’s lineup. It is not a sidewinder or laser-cut profile — it uses conventional pin-tumbler cuts along one edge. Key cutting machines with the appropriate TOY43 space-and-depth card or code-cutting software can produce the blade from a key code obtained through the vehicle’s VIN or from decoding an existing lock cylinder.

Aftermarket blanks from Strattec Security Corporation are manufactured to OEM dimensional tolerances. However, locksmiths should inspect the blade for burrs or slight dimensional variance after cutting, particularly at the tip and shoulder, since even minor deviations can cause binding in high-mileage ignition cylinders where wafer wear has tightened tolerances in unexpected ways.

Remote Programming Procedure Overview

After the transponder has been registered, the four-button remote section of the fob requires its own enrollment step. On most Toyota vehicles in the fitment list, remote programming is performed through the same diagnostic tool session used for transponder registration. Some older model years in the Tundra and Sequoia ranges may support an on-board programming sequence — a manual procedure using the ignition switch and door lock — but this method typically only works when at least one functioning remote is already paired to the vehicle.

The device transmits rolling-code signals at 315 MHz. Each time a button is pressed, a new encrypted code is generated and sent to the vehicle’s receiver module. This prevents replay attacks, where a previously captured signal could be used to unlock the vehicle. If the fob’s battery is replaced, reprogramming of the remote is generally not required — the rolling code synchronization persists through power loss in most cases.

OEM vs. Aftermarket Considerations

Toyota dealerships typically source OEM remote head keys under Toyota’s own part numbering system. The Strattec unit discussed here serves as an aftermarket equivalent, manufactured by Strattec Security Corporation, one of the largest automotive lock and key manufacturers in North America. Strattec supplies OEM locks and ignition assemblies to multiple automakers, so their aftermarket key products are built on the same manufacturing infrastructure.

For vehicle owners, the practical difference between this aftermarket unit and a dealer-sourced OEM key comes down to cost. Dealer key replacement — including cutting, programming, and the key itself — can run significantly higher than having an automotive locksmith handle the job with an aftermarket remote head key. Functionality, once properly cut and programmed, is identical: the same immobilizer handshake, the same remote range, the same button functions.

When to Call an Automotive Locksmith

Vehicle owners needing a replacement for any of the Toyota models listed above should seek an automotive locksmith equipped with advanced key programming hardware. The ID74-H transponder registration cannot be performed with basic tools or consumer-grade OBD readers. Mobile locksmith services are especially convenient for this type of job, since the entire process — blade cutting, transponder enrollment, and remote pairing — can be completed at the vehicle’s location without towing to a dealership.

Before scheduling service, owners should confirm the year, model, and trim of their vehicle, and ideally have the VIN available. This allows the locksmith to verify fitment and pull the correct key code prior to arrival, reducing on-site time and ensuring the correct blade profile is cut on the first attempt.