You didn't specify a year, but in most cases they are located somewhere in the floor console. Try looking under the radio or under the armrest.
Since you don't know the root cause, the new module might or might not fix the problem. You might have to reset one or more of the computers for this to work (I'm no expert). Make sure you know what you are doing, personally I wouldn't touch anything airbag related and leave it to the dealer. Can you have them install it for you?
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