TOLERANCE STACK Articles

The Problem: Zero Clearance Several of the seat mounting fasteners are tucked so deep or tight against factory structures that even the most compact torque wrench setups just don’t fit. These aren’t optional hardware either. They’re structural, safety-critical fasteners that directly secure the factory powered slide rails to the seat mount.

Navigating the intricacies of modern vehicle safety systems reveals a fascinating level of technological sophistication, particularly within Toyota's Occupant Classification System (OCS). Found in vehicles like the Tacoma (2nd and 3rd Gen, 2005-2023), FJ Cruiser, and 4Runner, the passenger seat houses a precisely calibrated array of load-cell sensors – typically four per seat for earlier models and two in the latest – all working in unison.