Toyota Fast Window Mod – 12V Relay Upgrade 3 Pack (with 3x harnesses)

Includes:

3x PCBs 

3x wire harnesses

Overview:

Experience faster window operation with this upgraded relay system designed for Toyota vehicles. This performance modification replaces the factory relay with a high-capacity component that reduces electrical resistance, enabling quicker window response times. Perfect for drivers seeking improved convenience and responsiveness. Installation is straightforward for those with basic automotive knowledge. Enhance your daily driving experience with noticeably snappier window control

Built by Land Cruiser enthusiasts, for Land Cruiser enthusiasts, this mod brings modern performance to classic trucks while maintaining OEM safety and reliability. Whether you’re daily driving or tackling off-road trails, enjoy windows that move as quickly as you do.

Faster Window Speed: Reduces voltage drop and delivers stronger current to motors for noticeably quicker operation.

Easy Installation: Full installation can be done in under 2 hrs with basic tools - installation video below.

Smart PCB Design: Professionally printed circuit board keeps the setup clean, compact, and reliable.

OEM-Safe & Reversible: Works within factory specs and can be removed anytime.

Improved Efficiency: Less strain on window motors and switches, helping extend component life.

Built for 12V Land Cruisers: Designed specifically for Toyota Land Cruiser models known for slow window response.

The slow power window issue isn’t unique to Land Cruisers — it’s common in several 1990s–2000s Toyota and Lexus vehicles that use the same relay-based window circuit design. Over time, the window switches and wiring develop voltage drop, which makes the motors sluggish.

Land Cruiser Family
60 Series (1980-1991)
80 Series (1991–1997)
100 Series (1998–2007)
LX450 (1996–1997)
LX470 (1998–2007)

Other Toyota Trucks & SUVs with Similar Issues
4Runner (1989–2009) — slow windows are common, especially 2nd and 3rd gens
Tacoma (1995–2004) — also suffers from voltage drop at the switch
Tundra (2000–2006) — same style power window circuit
Sequoia (2001–2007) — near-identical window wiring
Hilux Surf / Prado (international versions of 4Runner/Land Cruiser)

Forum Link

Installation video

Orders are processed within 2–3 business days after payment is received.

Delivery times vary by location, but most U.S. orders arrive within 7–10 business days.