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its normal for the relays to make a clicking sound when they open and close. it sounds like a clock. tick to close (start), tock to open (stop). the relays are located in the power distribution box, drivers side under the hood, to the rear of the battery. pull off the top cover and it will include a diagram of what's what. there are a number of relays that are all the same. you could try swapping a couple and see if you find one that is quieter. If your noise is coming from this box, then its the relays, and its normal. Under the dash is the CTU (central timing unit), which controls the intermittent wiper timing. This is also where the various chimes come from. Its just a circuit board and a speaker. I've never heard it make any noise.
 
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