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Q:

Itermediate wipers don't work right.
What controls them? on 2002 Buick Century

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Is it the Multifunction Switch or a relay and were is that located if it is that?
the switch is over $300
(3) Answers
Agree with Tbone, the motor is most likely the problem. Mechanic can test it but will need it to malfunction to do so! Possible switch, usually motor!
Are you talking about the delay function? if so this is controlled by a timer that is built into the wiper motor, do the regular speeds funtion as they should?
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