How To Wire BrandMotion Parking Sensors To Come On When Parking Or Entering Garage  

Question:

Expert Reply:

Carl, for the front bumper, these sensors are designed to run off accessory power with the included on/off switch. Most folks wire them so the switch is mounted within easy reach of the driver. That way, you can tap the button as you creep into your garage, then turn them off for normal driving so they’re not chirping at stoplights. If you wanted them to come on automatically, that would be very difficult without a custom wiring that only gets power at low speeds, so I think the toggle switch method is better.

Do you have an idea where you’d like that switch mounted? That’s the biggest factor for convenience.

The rear bumper sensors get wired to your reverse light circuit so that they turn on automatically when reversing/parking.

I've attached images that show the wiring diagrams for the BrandMotion Parking Sensor Kit front/rear # BM28YR.

expert reply by: Andrew N

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Rear bumper Parking Sensor Wiring Diagram
(click to enlarge)

front bumper parking sensor wiring diagram
(click to enlarge)

Carl

9/4/2025

Thanks, Andrew. If I wire the front sensors to a switch, will they drain the battery if I forget to turn them off?

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Andrew N.

9/4/2025

@Carl Good question, Carl. No worries there since the sensors only draw power when the switch is on and the ignition key is in accessory or run position. They won’t pull current from the battery if the car’s off.

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