Help with DC motor inside car door locks

Hey guys, not esk8-related, but since it’s DC motor-related, I figured someone might be able to help me out.

The driver side power door lock actuator of my car stopped working. I narrowed the problem down to a burnt out motor. I bought a replacement motor, but the replacement spins in the opposite direction by default. This is the replacement I bought:

I know that reversing the polarity of the input will reverse the direction the motor spins, but that’s a bit of a pain in the ass to do with the way it’s set up in my car’s wiring.

I was wondering if there was a way to reverse it on the motor’s end. I know how the magnets work to spin the motor… but I honestly don’t know what exactly determines a motor’s direction (is it the way the coils are wound?).

I already have a workaround planned with the wiring, but I was curious if there might be another way.

If you REALLY want to rewind the motor, you can wind the coils in the opposite direction. What makes reverse wiring difficult? Just paint the red wire black and the black wire red.

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Ah… okay… so the winding of the coils is what determines the direction. All I needed to know. I sure as heck don’t wanna bother with that! Haha.

Unfortunately finding the exact motor that was in my car has proven difficult, so I was stuck gambling with other similar motors, but sellers couldn’t tell me the rotational direction.

Why can’t you swap the wires going into the motor?

They’re attached to a connector in a very tucked away part of the door. I have another method I’m going to try… which is reversing some of the connections inside the actuator case.

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If you have to replace the motor, aren’t you going to be plugging wires into it?

Yes, but they’re crimped into a proprietary connector. I have access to just a bit of said connector head, but the wires themselves are tucked away pretty good. It’s not that it’s impossible… it’s that it’s a pain in the ass.

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What about thinking outside the box and reversing the window switch button wires?

No, most cars don’t work that way, the button actually interfaces with an 8-bit MCU that communicates over the car’s CAN or LIN bus.

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I figured I want to try to keep any reversals on the end of the actuator itself anyway. That way if I sell the car and the actuator needs to be replaced again someday (unlikely), that will be the only thing that’s reversed to avoid confusion with wiring.

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I’d just write “wiring reversed” on the motor with marker :rofl:

At least you’re giving them a chance, in the tiny tiny probability that it’s an issue in the future

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Yeahhhh you’re right. I guess it’s a highly unlikely scenario. Plus, if they replaced it with the motor I did, they’d be all good!

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