How to replace the headset for a toyota pickup 1989 3.0

I would like a demonstration of how to replace the headset.

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By headset you mean the cylinder head? Is yours a SR5 with a 3.0L V6 engine?

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or are you referring to the stereo?

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I'm sorry I meant the computer control relay. I want to know how to correctly replace the part.

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What are you referring to when you say "computer control relay"?

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The switch that controls the applications in the car.

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