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Tolerance Stack Solves the Missing Pieces of the 100 Series Seat Upgrade Puzzle

Updated: Aug 4

The Toyota 100 Series Land Cruiser
The Toyota 100 Series Land Cruiser

For years, Toyota 100 Series Land Cruiser and Lexus LX470 owners looking to upgrade their tired factory seats have had access to excellent aftermarket options. scheel-mann's renowned Vario F/XXL (heated) and Klima (heated and cooled) seats offer German-engineered comfort with 14-way adjustability, integrated heating, and ergonomic support that transforms long drives from endurance tests into comfortable journeys.


But there's always been one nagging compromise: losing the functionality of your factory seat heater switches or using a DIY workaround.


The Seat Heater Switch Problem

When you upgrade to scheel-mann seats, you're removing the OEM seat with all its factory wiring and the side-impact airbag (depending on the year) integrated into the seat. While the aftermarket seats come with integrated heaters, they require their own separate controls—meaning your perfectly functional center console seat heater switches become useless decoration.


Additionally, removing the factory seat triggers a persistent SRS airbag warning light that most installers simply ignore. Until now, every scheel-mann installation has accepted these limitations as inevitable parts of the upgrade process. Customers had to choose between keeping their factory switches functional or enjoying the superior comfort of aftermarket seating—all while dealing with a permanent airbag warning light on their dashboard.


Our Solution: True Plug-and-Play Integration Without Compromise

At Tolerance Stack, we refused to accept these compromises. After extensive development work, we're proud to announce the first and only complete solution that addresses both the switch integration and SRS airbag challenges.


Our custom harness adapters maintain complete OEM functionality while enabling you to control your new seat heaters through the familiar center console switches you've always used. Additionally, our airbag proxy ensures your SRS system functions exactly as designed, eliminating the persistent warning light that plagues every other aftermarket seat installation.

Our custom harness adapters maintain complete OEM functionality while enabling you to control your new seat heaters through the familiar center console switches you've always used. For customers choosing the Vario F/XXL heated seats, this provides complete factory integration with no additional switches needed—you completely bypass scheel-mann's supplied heater harness.

For those selecting the Klima heated and cooled seats, our harness handles the heating circuit integration with your factory switches (again, bypassing scheel-mann's heater wiring), while the cooling function utilizes the cooling portion of scheel-mann's supplied harness with their round switches. While we're exploring solutions for complete cooling circuit integration in the future, this hybrid approach still provides significantly better integration than any other solution currently offered.

Complete Coverage for All 100 Series Models

We've developed application-specific harnesses for the entire 100 Series production run:


The beauty of our solution is its universality—the same harness works for both driver and passenger sides, regardless of which seat you're upgrading. For those that had previously done the upgrade you can still get the plug-in harnesses to keep the OEM seat heater switches functioning and having the wiring look good.


What Makes Our Package Different

Complete Integration: Our harness adapters are the missing link that no other installation has solved. For heated seats, we provide true plug-and-play functionality with OEM connectors. For heated and cooled Klima seats, we handle the heating circuit integration while cooling uses scheel-mann's supplied switches.

SRS/Airbag Light Solution: We provide a proper airbag solution that maintains full SRS system functionality. While others ignore the airbag warning light or suggest customers live with it, we've engineered a professional solution that keeps your safety systems working as Toyota and Lexus intended.



Comprehensive Package: Everything you need for a complete installation:

  • scheel-mann Vario F/XXL or Klima seat (German-made)

  • Seat pan and sliding mount (USA-made)

  • Seatbelt bracket  (USA-made)

  • Our exclusive heater switch harness (USA-made)

  • Custom airbag proxy for proper SRS function  (USA-made)


The scheel-mann Advantage

The Vario seats we package aren't just comfortable—they're engineered for serious use:

  • 14-way adjustability including thigh support length, upper bolster width, and 4-way lumbar support

  • Integrated heating in both backrest and seat cushion

  • Adjustable lower cushion depth for drivers of all sizes

  • Hinged backrest for easy access to rear seats

  • Map net pocket on seat back for convenient storage


The Bottom Line

After years of compromise, 100 Series owners finally have access to a truly complete seat upgrade solution. Our plug-and-play harness technology eliminates the last barrier to achieving both superior comfort and factory-like integration.


For the first time, you can upgrade your seats without sacrificing functionality—exactly as it should be.


For more information about our 100 Series seat packages and harness adapters, visit tolerance-stack.com 



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