Complete Set of scheel-mann Vario F Install in a 2000 Toyota Tundra
- Services @ TS
- 5 hours ago
- 7 min read
Our customer Roberto drove his 2000 Tundra Limited from the Bay Area to southern Oregon to have the install done in person. He's 6'2" with long legs - a combination that makes most trucks either tolerable or terrible depending on the day. He'd ordered his seats back in May 2025 and had them shipped directly to the shop: a scheel-mann Vario F heat-only for the driver side and a Klima - heat and ventilation - for the passenger. The Access Cab body made pulling seats in and out significantly easier than a Double Cab would have been, which turned out to matter more than once.
What This Truck Has and What It Doesn't
The 2000 Tundra is old enough that factory heated seats weren't part of the picture. No heater circuits in the floor harness, no thermistor required, no Toyota heating system to integrate with. The scheel-mann seats bring their own heating and ventilation hardware and the Tolerance Stack switch mounts handle the controls. The wiring on this install was straightforward by Toyota standards.
What the truck does have, on the passenger side only, is an OCS (Occupant Classification System) pressure pad. That thin sensor mat lives inside the OEM passenger seat cushion and tells the vehicle whether someone is sitting there - directly controlling the passenger airbag system. It has to come out of the OEM seat and go into whichever seat ends up in the passenger position. You cannot leave it behind, and you cannot skip it.
The driver side had no position sensor, which was a little surprising but not a problem.
Battery disconnect wasn't necessary here. No airbag connectors were being touched and the wiring involved was basic enough that it wasn't a concern.
Passenger Side: OEM Seat Out
The passenger seat came out first. Two small screws in the plastic seat surround trim and then the trim itself has to come out before the seatbelt can be freed. The screws are easy to miss and they'll stop you cold if you don't find them. With the trim cleared, the seatbelt unbolts from the seat frame bracket and the harness unplugs.
The passenger floor harness on the 2000 Tundra is a 2-pin connector carrying seatbelt circuit signals. Simple. The driver side is a different story, covered below.
With the OEM seat on the bench, the real work started.
Extracting the OCS Pressure Pad
The OCS pad is bonded directly to the foam inside the OEM seat cushion at the factory - the entire face of the pad is glued down. Getting it out means peeling the leather cover back first, which means cutting hog rings.
There were roughly eight of them on the OEM passenger seat, located under the leather in the center section holding the cover down to the foam and structure beneath. Heavy-duty side cutters and needle-nose pliers. Hog rings are sharp - work carefully. Once the rings are cut and the cover is peeled back, the pad is visible sitting on top of the foam, fully adhered.
Removing it requires tearing it away from the foam carefully. It will not come off cleanly. The goal is to get it free without damaging the pad itself, then take it to the bench and clean the foam debris off the adhesive surface. The seatbelt buckle harness plugs into the OCS harness, which then plugs into the floor harness - all of that comes out together as one assembly and gets reused entirely.
Installing the OCS Pad into the scheel-mann Vario F
The Klima seat was going in on the passenger side first, so that's the cushion that got opened up to receive the pad.
The Vario F center cushion removal process is fairly simple: Recline the seat back fully. Remove the R-clip from under the front of the center cushion by pulling it straight forward - set it somewhere safe. Lift the front of the center cushion, slide it forward, and work it free from the side bolster tracks by twisting it around a vertical axis until the round metal tabs clear the tracks. It's a tight fit. Use fingers to guide the upholstery past the tabs if needed.
NOTE: you can work in the pressure pad without fully removing the lower seat cushion but if you have big hands it would be easier just removing it.
With the cushion out and flipped over, cut the ziptie on the heat wiring. Remove the hog rings from the rear upholstery flap using heavy-duty side cutters - there are additional rings under the small corner flaps once the main flap lifts. Cut and remove all of them.
Gently lift the back of the upholstery away from the foam, turning it inside out to expose the cushion foam. Peel back the thin white foam layer from a corner, working slowly with both hands - the glue resists and the foam tears if you rush it. If the seat heat mat tries to peel up with it, hold it down to the yellow molded foam. Work forward until there's enough space to position the pad.
Spray adhesive goes on the pad. The pad goes in flat - perfectly flat, zero bends, zero folds. A creased pad gives false readings and the airbag system will respond accordingly. Position it centered under where an occupant would sit, not past the middle of the cushion toward the front, not jammed against the back edge. Route the harness out the back alongside the existing seat heat wiring.
Reassembly: upholstery flaps back around, stretch the material before securing, new hog rings on the sides first then the rear flap, corners tucked and rear flap stretched forward so the top surface lays flat. Secure the wiring with a ziptie to one of the hogrings. Reinstall the center cushion, metal tabs into the correct track locations in the side bolsters, pull the cushion fully forward before lowering to clear the rear crossbar, then push back. R-clip back in place.
A Change of Plans
Roberto sat in the Klima seat on the passenger side and decided he wanted ventilation on the driver seat instead. His "significant other" wasn't there to formally protest. :P
The passenger seat came back out. The center cushion came back apart. The OCS pad - freshly adhered - got pulled free from the Klima cushion, cleaned up, and reinstalled into the heat-only Vario F cushion using the same process. The Klima became the driver seat. The heat-only with the OCS pad correctly installed became the passenger seat.
The non-permanent spray adhesive made the second removal clean. No foam damage, no pad damage. It just meant doing the full cushion procedure twice on that pad. The Access Cab made the seat removal and reinstall faster than it would have been otherwise, which helped.
Driver Side
The driver side floor harness on the 2000 Tundra is a 4-pin connector. Two pins are seatbelt circuit. The other two fed the factory power seat motor. This truck had a powered driver seat from the factory. Since the scheel-mann seat doesn't use those motor circuits, those two wires were trimmed back and stowed inside the loom with about 8 inches of length left accessible. They're constant hot. Roberto has plans for a center console fridge and those wires will be useful when that happens. Nothing gets cut that doesn't have to be.
The seatbelt bracket install was the same on both sides: bolt mount facing upward, OEM seatbelt wiring routed under the seat but forward of the bracket, sitting in the space created by the bracket and its spacers.
The Tolerance Stack Single and Dual Switch Mounts
Both seats got Tolerance Stack switch mounts - a Single for the passenger side heat-only Vario F, a Dual for the driver side Klima. These mount directly to the seat mount bracket and face toward the door.
The reason the extension harnesses that come with the scheel-mann seats get removed during this install is simple: the extensions exist to route control wiring up to a dash-mounted switch location. With the Tolerance Stack switch mounts, the switches live right at the seat. There's no reason to run two extra feet of harness to a dash panel when the controls are already exactly where your hand is. Remove the extensions, plug the switch mount harness in, done.
From a seated position the switches are immediately accessible without looking. The single switch on the passenger side handles heat. The dual on the driver side handles heat and ventilation independently. Both illuminate when active.
All harnesses were zip-tied clear of the seat travel path on both sides. Seats were cycled fully forward and rearward to confirm nothing was binding.
Power Supply
Three cigarette lighter outlets sit in the lower center dash area on the 2000 Tundra. One was decommissioned to supply ground and switched power for both seats. The OEM 2-pin cig plug came off, new terminals were crimped on, and a new matching 2-pin connector tied everything together. Ground and hot leads for both seats had been staged in the center console area during the install. This is where they landed.
How It Came Out
The mount profile was barely visible from the door opening. The switch mounts tucked right up under the seat pan on each side, accessible without looking.
Roberto's first reaction to the driver seat was that it felt firm. He's not wrong - scheel-mann seats are firm by design and they break in with miles. He knew that going in. He called it "badass", loaded up, and headed back to Oakland. It was around 10pm.
350 miles of highway in seats that actually fit the person driving. That's what this is for. #scheelmannusa #scheelmannseats #toyotatundra #tundra #tundranation #2000tundra #toyotanation #truckseats #seatupgrade #overlanding #overland #offroad #truckaccessories #truckmods #truckbuild #talldriver #drivercomfort #seatingupgrade #autoupholstery #carinterior #tolerancestack #switchmount #ocssensor #soreback
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