How do the power door locks work on my 1990 Mustang ?

The power door locks work by reversing the polarity of the voltage to the motor which moves the lock mechanism. I don't think this is done directly by the door switch. Does the door switch control relays which are somewhere else? Does anyone have have a circuit diagram or can you explain how this is done? The... show more The power door locks work by reversing the polarity of the voltage to the motor which moves the lock mechanism. I don't think this is done directly by the door switch. Does the door switch control relays which are somewhere else? Does anyone have have a circuit diagram or can you explain how this is done? The power windows also seem to use the same system since they switches are the same. Thanks, Chas
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