A seat heater that has stopped working is almost always a broken heating element in the seat bottom, a worn-out switch, or a blown fuse. Here is the order to check them and what each costs.
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The nichrome wire in the seat cushion breaks after years of getting in and out, especially under the driver thigh bolster. The element shows infinite ohms on a multimeter. Replacement requires removing the seat cover. Cost: $80 - $400. DIY: Hard. Severity: Low.
Get a Free AI Diagnosis →The 3-position switch on the dash or seat develops a bad high setting first. If low works but high does not (or vice versa), it is the switch. Cost: $30 - $150. DIY: Medium. Severity: Low.
Get a Free AI Diagnosis →Each heated seat usually has a 20-30A fuse in the under-hood or driver kick panel fuse box. A blown element will sometimes blow this on the way out. Cost: $5 - $20. DIY: Easy. Severity: Low.
Get a Free AI Diagnosis →The relay clicks but no power reaches the element, or the seat heater module itself fails. Multimeter test at the seat connector confirms. Cost: $30 - $250. DIY: Medium. Severity: Low.
Get a Free AI Diagnosis →Some heated seats have a temp sensor that cuts power if it reads "too hot" - if the sensor fails it locks the heater off. Diagnosed with scan tool. Cost: $100 - $300. DIY: Hard. Severity: Low.
Get a Free AI Diagnosis →Before paying a shop, run this short check. About 80% of these issues come down to a blown fuse, a tripped circuit, or a stuck switch.
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It is possible with a special crimp kit ($30-$50) sold for seat heater repair, but durability is mixed. Most people replace the full element pad ($80-$150 part).
8-12 years on average. Driver side fails first because it gets all the slide-in wear.
They work but install requires removing the seat cover, just like an OEM element. If you are already in there, OEM is the same labor.
Almost always a wire breaking inside the harness under the seat from sliding. Wiggle the harness with the heater on to confirm.
Yes - it is a comfort feature, no safety implication. Just chilly in winter.
2-3 hours typical, $200-$400 labor depending on shop rate. The cover has to come off and the new element glued in place.