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sprinkles08, ASE Certified Technician
Category: Ford
Satisfied Customers: 22648
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Ford Taurus 2008 neither driver/passenger seats heat. Dash

Customer Question

Ford Taurus 2008 neither driver/passenger seats heat. Dash push button switches LED lit, when pushed the two tiny LEDs above flash but go out. Seems likely some circuit common to both sides downstream from the dash switches is open. Someone says the grounds from the two heaters are separate so not common to both seats and open would not affect both. The C3304 Heated Seat Heat Module under the driver seat- does that control BOTH seats, so if bad could cause these indications? Dealer spent 20 mins, presumably checked fuse, said tracing would be expensive.
Submitted: 1 year ago.
Category: Ford
Expert:  sprinkles08 replied 1 year ago.

Hello and welcome to JustAnswer!

The same module does indeed control both seats. It would be more likely that you have open elements in each seat, but if both stopped working at exactly the same time then a failed heated seat module or loss of power or ground to the module are very possible.

Did both stop working at exactly the same time?

Customer: replied 1 year ago.
Thanks for your reply! Both seats were not working when I bought the car so don't know if they quit at same time. How do I access the seat heaters to test or replace them?
Expert:  sprinkles08 replied 1 year ago.

The wiring can be accessed at the module or from under the seat where the wiring goes to each element. What you'd need to do is test the continuity of each of the elements in both seats. If you have an open circuit in one element it will prevent that entire seat from heating.