ND Miata Seat Removal (2016+ MX-5)

Pulling the seats out of an ND is a 20-minute job per side once you know where the connectors are. People do it to fit a fixed-back race seat, to install harness bar hardware, to clean carpet, or just to get more headroom by ditching the heavy power-adjust base. The mechanical part is trivial. The part that bites people is the airbag and occupant-detection wiring — disconnect those wrong and you get an SRS warning light that won’t clear on its own.

This covers the NA 2.0 ND1 (2016–2018) and ND2 (2019+) Miata, plus the mechanically identical Fiat 124 Spider. Soft top and RF are the same in the cabin.

What you need

14mm socket on a ratchet (long extension helps reach the rear bolts)
Flathead screwdriver or trim tool for the connector locks
A blanket or moving pad — the seats are heavier than they look (the power base is the worst, roughly 45–50 lb)

That’s it. Every fastener holding the seat to the floor is the same 14mm bolt.

Step 1: Disconnect the battery and wait

This is the step people skip and regret. The SRS system holds a charge in a backup capacitor so the airbags still fire briefly after power is cut. Disconnect the negative terminal on the battery (it’s in the trunk on the ND, passenger side) and wait at least one minute before touching any seat wiring. This drains the reserve and is what keeps an accidental bump from deploying the seat side-airbag.

If you only do mechanical work and never touch the connectors, you can technically skip this — but every ND seat has the side-airbag connector under it, so don’t.

Step 2: Remove the four bolts

Each seat is held by four 14mm bolts:

Two at the front, under plastic caps. Pry the caps off with a flathead.
Two at the rear, exposed at the back of the rails.

Slide the seat all the way back to reach the front bolts, then all the way forward to reach the rears. Manual seats slide by the lever; power seats need ignition on to move — so position the seat before you disconnect the battery in Step 1, or budget for moving it on residual power.

Bolt torque on reinstall is about 28 lb-ft (38 N·m). These are structural; they’re what the seat belt anchors to on the manual seats. Don’t leave them finger-tight.

Step 3: Tilt the seat back and find the connectors

With all four bolts out, tilt the seat backward to expose the wiring underneath. Depending on trim you’ll see up to three connectors:

Yellow connector — side airbag. Yellow is the universal automotive color for SRS/pyrotechnic circuits. There’s a locking tab; lift it and the plug releases. This is the one the battery wait protects you from.
Occupant/seat-weight sensor. The ND uses a weight-based occupant classification sensor in the passenger seat to decide whether to arm the passenger airbag. The driver seat has a seat-belt buckle/tension sensor instead.
Power and heat connectors (power seats / heated seats only). These aren’t safety-critical, just unclip them.

Press the release tab on each, don’t yank by the wire. Once they’re free, lift the seat straight up and out the door.

Avoiding the SRS light

The airbag warning light comes on the moment the SRS module sees an open circuit on a squib (airbag) line. Two rules keep it off:

Battery disconnected, capacitor drained before you unplug the yellow connector — otherwise unplugging it under power logs a fault.
Don’t leave it driving with the connector open. If you’re removing seats to fit fixed-back race buckets that have no side airbag, the SRS module will set a permanent code because it expects to see the squib resistance. You need a resistor bypass matched to the airbag’s resistance on that circuit, or the light stays on. This is exactly the situation that comes up when fitting track seats — see harnesses and track seats for the seat-side wiring.

If a light does come on after a clean reinstall, it’s almost always a connector that didn’t fully latch. Reseat it, reconnect the battery, and the light should clear after a key cycle or two. A code that persists past that needs an OBD tool that can talk to the SRS module to clear stored fault — a generic engine-side scanner won’t do it. See OBD adapters and apps for what reaches the body/SRS modules.

Reinstallation notes

Reconnect every connector before the battery, and confirm each locking tab clicks home.
Feed the seat belt back through cleanly — on manual seats the belt anchors to the seat frame, so a twisted belt is a real safety problem, not a cosmetic one.
Torque the four bolts to ~28 lb-ft.
Reconnect the battery last. Cycle the ignition and check that the airbag light illuminates at startup and then goes out. A light that stays on means something’s open.

A note on the stock seats

The factory ND seat is light for a modern car but still the single heaviest easily-removable item in the cabin. The manual-adjust seat is meaningfully lighter than the power seat; if you’re chasing weight for autocross or track, the swap to a fixed-back composite seat (Cobra, Sparco, Bride, etc.) saves real pounds low in the chassis — but commits you to the resistor-bypass and harness work above. Plan the roll bar and harness mounting as one project, not three.