I got mine replaced by my extended warranty due to my dash lights not working. The multiplex control on the driver side kick panel controls your power locks. If you are having problems with your power locks not working and it's not a blown fuse, then replace the multiplex.
On the fuse box under the dash. The blue box is the ICU.
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I am not familiar with a multiplex, but if you are referring to the instrument cluster then yes the computer will store your mileage. If it is the speed sensor that is the problem then no.
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