Heated seats fail at one of three points: a broken heating element inside the cushion, a bad temperature sensor that thinks the seat is already hot, or a switch/fuse problem upstream. The element is the most common. Here is the ranked list.
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A thin wire grid runs through the seat cushion and seatback. After years of flexing, a wire breaks - usually in the bolster or at the front edge of the cushion. Element kits exist but require pulling the seat upholstery. Cost: $200 - $600. DIY: Hard. Severity: Low.
Get a Free AI Diagnosis →A thermistor in the cushion thinks the seat is already at full temp and shuts the heater off after a second or two. Replacement is often included with element repair. Cost: $100 - $400. DIY: Hard. Severity: Low.
Get a Free AI Diagnosis →The button on the dash or seat side wears out. Indicator light may not even come on when pressed. Replace the switch ($30-$200) or the integrated center stack panel. Cost: $30 - $250. DIY: Medium. Severity: Low.
Get a Free AI Diagnosis →Heated seats draw 10-15 amps each. A blown "SEAT HEATER" or "HTD SEAT" fuse kills one or both seats at once. Inexpensive fix if that is all that is wrong. Cost: $2 - $10. DIY: Easy. Severity: Low.
Get a Free AI Diagnosis →A connector under the seat works loose from sliding the seat back and forth thousands of times. Check the harness under the seat first - sometimes just plugging it back in solves it. Cost: $0 - $50. DIY: Easy. Severity: Low.
Get a Free AI Diagnosis →Work through these in order. Stop as soon as you find the cause - you usually do not need all four.
Find the "SEAT HTR," "HTD SEAT," or similar fuse (often 15-20A) in the under-dash panel. Some cars have separate fuses per seat. Inspect and replace if blown.
Slide the seat all the way forward, then back, looking at the wiring harness underneath. Reconnect any loose connectors. The big white or black square connector under most front seats is the most common loose one.
Press the heat button and watch for the indicator light. No light = switch or wiring; light but no heat = element or sensor in the seat. If the light blinks rapidly, the seat heater module has detected an open element and shut off.
Universal heated seat kits ($60-$120 per seat) install under the existing upholstery as a low-cost alternative when the factory element is broken. Run wiring to a new switch.
If your scanner shows one of these B-codes (body) along with the symptom, run a free AI diagnosis to confirm.
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Either the heating element wire is broken inside the cushion or the temperature sensor thinks the seat is already hot. Both require pulling the seat cover; element repair is the more common fix.
$200 - $600 at a shop including new element wires and labor to pull the cover. DIY universal kits run $60-$120 per seat but look less factory.
The temperature sensor is bad. It reads "hot" almost immediately and the controller shuts the heater off as a safety. Replace sensor and element together.
Yes - especially if both seats died at the same time. Check the heated seat fuse first.
Hard - the seat has to come out, the cover off, and the element installed without wrinkles. Most owners pay the shop unless they are upholstery-savvy.
Element or sensor in the dead seat is bad. Switch and fuse are usually fine because they tested OK on the working seat side.